From alenaslifar at gmail.com  Tue Jul  4 16:45:13 2017
From: alenaslifar at gmail.com (Alena Lifar)
Date: Tue, 4 Jul 2017 23:45:13 +0300
Subject: [Flask] Flask Extension Development
Message-ID: <CAN_7BgiB3gqkDjT4tiShZKF2MMAyZnZOneCiq-J=qN_eMKC-ww@mail.gmail.com>

Hello everyone,

My name is Alena and I have been working on a Flask Extension that collects
and exposes routes declared in your Flask application/Blueprint via REST.

Here is Github project: https://github.com/UseTheApi/flask_url_discovery

Could anyone please take a look and let me know if this could be useful? Do
you think it has a chance to be added into Flask Extension Registry? Is
there anything I have to improve?

I have found this link: http://librelist.com/browser/flask/2010/7/25/flask-
extension-review-status/ which points to http://github.com/
mitsuhiko/flask/tree/master/extreview/ for Flask Extensions review and
approval but this link is dead.

Thank you for your time.

Kind regards,
Alena
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170704/daeb8073/attachment.html>

From joanbr at gmail.com  Tue Jul  4 17:17:14 2017
From: joanbr at gmail.com (Joan Bales)
Date: Tue, 4 Jul 2017 23:17:14 +0200
Subject: [Flask] Flask Mega-Tutorial
Message-ID: <CA+zbyxHvcGG9F5jeuFncUA1wa=M2NbrvRVdYS79gsF71OX3mLw@mail.gmail.com>

Hi there!

Flask fans, this one will be interesting for someone, from our best read
Flask tutorial guy, Miguel Grinberg.

https://www.kickstarter.com/projects/1124925856/the-new-and-improved-flask-mega-tutorial

Bests,
Joan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170704/547174b1/attachment.html>

From gergely at polonkai.eu  Wed Jul  5 04:33:04 2017
From: gergely at polonkai.eu (Gergely Polonkai)
Date: Wed, 05 Jul 2017 08:33:04 +0000
Subject: [Flask] Flask Extension Development
In-Reply-To: <CAN_7BgiB3gqkDjT4tiShZKF2MMAyZnZOneCiq-J=qN_eMKC-ww@mail.gmail.com>
References: <CAN_7BgiB3gqkDjT4tiShZKF2MMAyZnZOneCiq-J=qN_eMKC-ww@mail.gmail.com>
Message-ID: <CACczBUKB5UF28-tRH-O1kDcizw=Ra+qUmWsQiv+=Z5AK+8mprw@mail.gmail.com>

Hello,

I like the idea, although unless I can deliberately hide some views, or
much better, if I can select which routes I want to expose, this is a no-go.

There are routes in some of my apps I definitely don't want to expose, like
administrative ones.

Also, with routes that require parameters, you will have to expose metadata
on what type of data goes there, what the format might be, etc. And even
though I tell my users to put an integer in a specific parameter, attackers
will still try to inject something else to exploit my app (although that
might happen even if I don't expose my routes.) Be ready for security
concerns on the long run!

About the Flask registry, I wouldn't bother uploading it there until some
level of maturity. Post the library here and there, and if others like it
and start using it, you may think about it again.

Best,
Gergely

On Tue, Jul 4, 2017, 22:45 Alena Lifar <alenaslifar at gmail.com> wrote:

> Hello everyone,
>
> My name is Alena and I have been working on a Flask Extension that
> collects and exposes routes declared in your Flask application/Blueprint
> via REST.
>
> Here is Github project: https://github.com/UseTheApi/flask_url_discovery
>
> Could anyone please take a look and let me know if this could be useful?
> Do you think it has a chance to be added into Flask Extension Registry? Is
> there anything I have to improve?
>
> I have found this link:
> http://librelist.com/browser/flask/2010/7/25/flask-extension-review-status/ which
> points to http://github.com/mitsuhiko/flask/tree/master/extreview/ for
> Flask Extensions review and approval but this link is dead.
>
> Thank you for your time.
>
> Kind regards,
> Alena
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170705/6c5729f9/attachment.html>

From alenaslifar at gmail.com  Wed Jul  5 05:36:13 2017
From: alenaslifar at gmail.com (Alena Lifar)
Date: Wed, 5 Jul 2017 12:36:13 +0300
Subject: [Flask] Flask Extension Development
In-Reply-To: <CAN_7BgiPhAyTyku4BJcKdUGF+RvouF5+UWuF+SWEcaO0-Eek5g@mail.gmail.com>
References: <CAN_7BgiB3gqkDjT4tiShZKF2MMAyZnZOneCiq-J=qN_eMKC-ww@mail.gmail.com>
 <CAE1ZAF853VC7-0ckcovQHomH-AOTJ6gsyRO7FobotT19zcT_6Q@mail.gmail.com>
 <CAN_7BgiPhAyTyku4BJcKdUGF+RvouF5+UWuF+SWEcaO0-Eek5g@mail.gmail.com>
Message-ID: <CAN_7BgiwEsA7YwxLTa6F0B99vqdVL59tY45njjxZ2Ms-d36cew@mail.gmail.com>

Hi Gergely,

I completely agree that exposing all routes without an option of hiding
some of them is a no-go. In my package you can use private() decorator func
in order to hide either a route or a Blueprint. I have put some examples in
the Readme:

@private()@app.route('/restricted_route/')def private_endpoint():
    return 'Hello Private Endpoint'


As well as Blueprints:

# or: app_bp = private(Blueprint('my_bp', __name__))
app_bp = Blueprint('my_bp', __name__)
private(app_bp)


Does it correlate to your suggestion?

My vision of requests with parameters was to just put those in the
available url string as is (just like they were put in route()):

"hello_world": {                              // name of a public endpoint
        "active_urls": [
            "/",
            "/health_check/<int:customer_id>/"
        ],
        "methods": [
            "GET",
            "HEAD",
            "OPTIONS"
        ]
    },


By providing more information like required param format or an example of
response format for a given route I think I'd create a vulnerability. I
think that everything about data formats has to be in the API docs. This
extension aimed to get rid of hardcoded api urls in the components/client
code mostly...

Please, let me know what you think.

P.S. I'm quite new to contributing something valuable to the open-source.
Could you please suggest me any resources that I might share my work with?

Thank you for your help and for the feedback.

Kind regards,
Alena

On Wed, Jul 5, 2017 at 11:34 AM, Alena Lifar <alenaslifar at gmail.com> wrote:

> Hi Abdesslem,
>
> Awesome, thanks!
>
> Kind regards,
> Alena
>
> On Wed, Jul 5, 2017 at 9:31 AM, Abdesslem Amri <amriabdesslem at gmail.com>
> wrote:
>
>> Hi,
>>
>> To add a new extension. you have to make a pull request to
>> https://github.com/pallets/flask-website.
>>
>> Best regards,
>> Abdesslem Amri
>>
>> 2017-07-04 22:45 GMT+02:00 Alena Lifar <alenaslifar at gmail.com>:
>>
>>> Hello everyone,
>>>
>>> My name is Alena and I have been working on a Flask Extension that
>>> collects and exposes routes declared in your Flask application/Blueprint
>>> via REST.
>>>
>>> Here is Github project: https://github.com/UseTheApi/flask_url_discovery
>>>
>>> Could anyone please take a look and let me know if this could be useful?
>>> Do you think it has a chance to be added into Flask Extension Registry? Is
>>> there anything I have to improve?
>>>
>>> I have found this link: http://librelist.com/bro
>>> wser/flask/2010/7/25/flask-extension-review-status/ which points to
>>> http://github.com/mitsuhiko/flask/tree/master/extreview/ for Flask
>>> Extensions review and approval but this link is dead.
>>>
>>> Thank you for your time.
>>>
>>> Kind regards,
>>> Alena
>>>
>>> _______________________________________________
>>> Flask mailing list
>>> Flask at python.org
>>> https://mail.python.org/mailman/listinfo/flask
>>>
>>>
>>
>>
>> --
>> ------------------------------
>>
>> The preceding message (including attachments) is covered by the
>> Electronic Communication Privacy Act, 18 U.S.C. sections 2510-2512, is
>> intended only for the person or entity to which it is addressed, and may
>> contain information that is confidential, protected by attorney-client or
>> other privilege, or otherwise protected from disclosure by law. If you are
>> not the intended recipient, you are hereby notified that any retention,
>> dissemination, distribution, or copying of this communication is strictly
>> prohibited. Please reply to the sender that you have received the message
>> in error and destroy the original message and all copies.
>>
>> _______________________________________________
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170705/46170038/attachment-0001.html>

From rmorgan466 at gmail.com  Thu Jul  6 21:02:00 2017
From: rmorgan466 at gmail.com (Rita)
Date: Thu, 6 Jul 2017 21:02:00 -0400
Subject: [Flask] flask queue question
Message-ID: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>

Been using flask in my lab for the past few years. It just works. We
recently got some grad students and it seems we are seeing some slowness in
our flask applications running on Windows 2012 with enthought python.

currently I am running it in a single threaded mode with nginx (
http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#proxy-setups).
My question is: When 2 users hit my flask page, does it get blocked until
the first user finishes his request - it seems that the case. Is there a
way to view the "queue" length? How is this queue maintained, or is it done
by operating system networking stack?



-- 
--- Get your facts first, then you can distort them as you please.--
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170706/6476e41e/attachment.html>

From amriabdesslem at gmail.com  Fri Jul  7 03:19:04 2017
From: amriabdesslem at gmail.com (Abdesslem Amri)
Date: Fri, 7 Jul 2017 09:19:04 +0200
Subject: [Flask] flask queue question
In-Reply-To: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
Message-ID: <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>

Using the simple app.run() from within Flask creates a single synchronous
server on a single thread capable of serving only one client at a time.

2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:

> Been using flask in my lab for the past few years. It just works. We
> recently got some grad students and it seems we are seeing some slowness in
> our flask applications running on Windows 2012 with enthought python.
>
> currently I am running it in a single threaded mode with nginx (
> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#proxy-setups).
> My question is: When 2 users hit my flask page, does it get blocked until
> the first user finishes his request - it seems that the case. Is there a
> way to view the "queue" length? How is this queue maintained, or is it done
> by operating system networking stack?
>
>
>
> --
> --- Get your facts first, then you can distort them as you please.--
>
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
>


-- 
------------------------------

The preceding message (including attachments) is covered by the Electronic
Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended only
for the person or entity to which it is addressed, and may contain
information that is confidential, protected by attorney-client or other
privilege, or otherwise protected from disclosure by law. If you are not
the intended recipient, you are hereby notified that any retention,
dissemination, distribution, or copying of this communication is strictly
prohibited. Please reply to the sender that you have received the message
in error and destroy the original message and all copies.

_______________________________________________
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170707/1e02c14d/attachment.html>

From rmorgan466 at gmail.com  Fri Jul  7 06:33:23 2017
From: rmorgan466 at gmail.com (Rita)
Date: Fri, 7 Jul 2017 06:33:23 -0400
Subject: [Flask] flask queue question
In-Reply-To: <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
Message-ID: <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>

yes, i understand that. how come when i submit ten concurrent requests none
of them get lost and eventually finish? how is that maintained?

On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <amriabdesslem at gmail.com>
wrote:

> Using the simple app.run() from within Flask creates a single synchronous
> server on a single thread capable of serving only one client at a time.
>
> 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
>
>> Been using flask in my lab for the past few years. It just works. We
>> recently got some grad students and it seems we are seeing some slowness in
>> our flask applications running on Windows 2012 with enthought python.
>>
>> currently I am running it in a single threaded mode with nginx (
>> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#proxy-setups).
>> My question is: When 2 users hit my flask page, does it get blocked until
>> the first user finishes his request - it seems that the case. Is there a
>> way to view the "queue" length? How is this queue maintained, or is it done
>> by operating system networking stack?
>>
>>
>>
>> --
>> --- Get your facts first, then you can distort them as you please.--
>>
>> _______________________________________________
>> Flask mailing list
>> Flask at python.org
>> https://mail.python.org/mailman/listinfo/flask
>>
>>
>
>
> --
> ------------------------------
>
> The preceding message (including attachments) is covered by the Electronic
> Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended only
> for the person or entity to which it is addressed, and may contain
> information that is confidential, protected by attorney-client or other
> privilege, or otherwise protected from disclosure by law. If you are not
> the intended recipient, you are hereby notified that any retention,
> dissemination, distribution, or copying of this communication is strictly
> prohibited. Please reply to the sender that you have received the message
> in error and destroy the original message and all copies.
>
> _______________________________________________
>



-- 
--- Get your facts first, then you can distort them as you please.--
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170707/af45a0f3/attachment.html>

From ziirish at ziirish.info  Fri Jul  7 08:10:48 2017
From: ziirish at ziirish.info (Ziirish)
Date: Fri, 7 Jul 2017 14:10:48 +0200
Subject: [Flask] flask queue question
In-Reply-To: <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
Message-ID: <20170707121048.GW5364@mail.ziirish.info>

Hello,

Here is a simplified view of the underlying parts on which the Flask's
"built-in server" is built (with the default settings):

Flask.run() -> werkzeug.serving.run_simple() -> BaseHTTPServer.HTTPServer() -> SocketServer.TCPServer()

Sources:

https://github.com/pallets/flask/blob/master/flask/app.py#L823
https://github.com/pallets/werkzeug/blob/master/werkzeug/serving.py#L605
https://github.com/pallets/werkzeug/blob/master/werkzeug/serving.py#L576
https://docs.python.org/2/library/basehttpserver.html
https://docs.python.org/2/library/socketserver.html#SocketServer.TCPServer

On this last page you can read:

> These four classes process requests synchronously; each request must be
> completed before the next request can be started. This isn?t suitable if
> each request takes a long time to complete, because it requires a lot of
> computation, or because it returns a lot of data which the client is slow
> to process. The solution is to create a separate process or thread to handle
> each request; the ForkingMixIn and ThreadingMixIn mix-in classes can be used
> to support asynchronous behaviour.

So yes, the requests are processed synchronously by default, and the request
queue size is 5 (https://docs.python.org/2/library/socketserver.html#SocketServer.BaseServer.request_queue_size).
This means you can only have 5 queued requests, the other will just get
rejected.

Unfortunately, werkzeug does not provide any mean to override the default
request_queue_size, but according to the socket.listen doc (where this setting
is used), this value seem reasonably chosen: https://docs.python.org/2/library/socket.html#socket.socket.listen


Now, here are your options. As stated in the doc (http://flask.pocoo.org/docs/0.12/deploying/),
the built-in server is *not* suitable for *production*. You can however choose
whatever solution you feel the more comfortable with here:
http://flask.pocoo.org/docs/0.12/deploying/#self-hosted-options
These will probably allow you to tweak the queue size, serve multiple requests
concurrently, etc.



* On Friday, July 07, 2017 at 06:33 AM -0400, Rita <rmorgan466 at gmail.com> wrote:
> yes, i understand that. how come when i submit ten concurrent requests none
> of them get lost and eventually finish? how is that maintained?
> 
> On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <amriabdesslem at gmail.com>
> wrote:
> 
> > Using the simple app.run() from within Flask creates a single synchronous
> > server on a single thread capable of serving only one client at a time.
> >
> > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
> >
> >> Been using flask in my lab for the past few years. It just works. We
> >> recently got some grad students and it seems we are seeing some slowness in
> >> our flask applications running on Windows 2012 with enthought python.
> >>
> >> currently I am running it in a single threaded mode with nginx (
> >> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#proxy-setups).
> >> My question is: When 2 users hit my flask page, does it get blocked until
> >> the first user finishes his request - it seems that the case. Is there a
> >> way to view the "queue" length? How is this queue maintained, or is it done
> >> by operating system networking stack?

From paradox2005 at gmail.com  Fri Jul  7 08:54:26 2017
From: paradox2005 at gmail.com (Adil Hasan)
Date: Fri, 7 Jul 2017 13:54:26 +0100
Subject: [Flask] flask queue question
In-Reply-To: <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
Message-ID: <20170707125423.GG4010@raddish>

Hello Rita,
I wonder. Do you think that the nginx server is handling the requests?
I think the webserver is the service that will manage requests. At least
I think that it is.
hth
adil

On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
> yes, i understand that. how come when i submit ten concurrent requests none
> of them get lost and eventually finish? how is that maintained?
> 
> On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <amriabdesslem at gmail.com>
> wrote:
> 
> > Using the simple app.run() from within Flask creates a single synchronous
> > server on a single thread capable of serving only one client at a time.
> >
> > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
> >
> >> Been using flask in my lab for the past few years. It just works. We
> >> recently got some grad students and it seems we are seeing some slowness in
> >> our flask applications running on Windows 2012 with enthought python.
> >>
> >> currently I am running it in a single threaded mode with nginx (
> >> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#proxy-setups).
> >> My question is: When 2 users hit my flask page, does it get blocked until
> >> the first user finishes his request - it seems that the case. Is there a
> >> way to view the "queue" length? How is this queue maintained, or is it done
> >> by operating system networking stack?
> >>
> >>
> >>
> >> --
> >> --- Get your facts first, then you can distort them as you please.--
> >>
> >> _______________________________________________
> >> Flask mailing list
> >> Flask at python.org
> >> https://mail.python.org/mailman/listinfo/flask
> >>
> >>
> >
> >
> > --
> > ------------------------------
> >
> > The preceding message (including attachments) is covered by the Electronic
> > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended only
> > for the person or entity to which it is addressed, and may contain
> > information that is confidential, protected by attorney-client or other
> > privilege, or otherwise protected from disclosure by law. If you are not
> > the intended recipient, you are hereby notified that any retention,
> > dissemination, distribution, or copying of this communication is strictly
> > prohibited. Please reply to the sender that you have received the message
> > in error and destroy the original message and all copies.
> >
> > _______________________________________________
> >
> 
> 
> 
> -- 
> --- Get your facts first, then you can distort them as you please.--

> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask


From rmorgan466 at gmail.com  Fri Jul  7 08:56:59 2017
From: rmorgan466 at gmail.com (Rita)
Date: Fri, 7 Jul 2017 08:56:59 -0400
Subject: [Flask] flask queue question
In-Reply-To: <20170707125423.GG4010@raddish>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
 <20170707125423.GG4010@raddish>
Message-ID: <CAOF-Kfj7+hdaSOUcACRqzEK7Miq9ygmyNy6YLkqw4KWHztKQkQ@mail.gmail.com>

yeah, my traffic is going thru nginx. Its acting as a proxy. Can you
recommend a good wsgi server for windows?

On Fri, Jul 7, 2017 at 8:54 AM, Adil Hasan <paradox2005 at gmail.com> wrote:

> Hello Rita,
> I wonder. Do you think that the nginx server is handling the requests?
> I think the webserver is the service that will manage requests. At least
> I think that it is.
> hth
> adil
>
> On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
> > yes, i understand that. how come when i submit ten concurrent requests
> none
> > of them get lost and eventually finish? how is that maintained?
> >
> > On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <amriabdesslem at gmail.com>
> > wrote:
> >
> > > Using the simple app.run() from within Flask creates a single
> synchronous
> > > server on a single thread capable of serving only one client at a time.
> > >
> > > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
> > >
> > >> Been using flask in my lab for the past few years. It just works. We
> > >> recently got some grad students and it seems we are seeing some
> slowness in
> > >> our flask applications running on Windows 2012 with enthought python.
> > >>
> > >> currently I am running it in a single threaded mode with nginx (
> > >> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#
> proxy-setups).
> > >> My question is: When 2 users hit my flask page, does it get blocked
> until
> > >> the first user finishes his request - it seems that the case. Is
> there a
> > >> way to view the "queue" length? How is this queue maintained, or is
> it done
> > >> by operating system networking stack?
> > >>
> > >>
> > >>
> > >> --
> > >> --- Get your facts first, then you can distort them as you please.--
> > >>
> > >> _______________________________________________
> > >> Flask mailing list
> > >> Flask at python.org
> > >> https://mail.python.org/mailman/listinfo/flask
> > >>
> > >>
> > >
> > >
> > > --
> > > ------------------------------
> > >
> > > The preceding message (including attachments) is covered by the
> Electronic
> > > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended
> only
> > > for the person or entity to which it is addressed, and may contain
> > > information that is confidential, protected by attorney-client or other
> > > privilege, or otherwise protected from disclosure by law. If you are
> not
> > > the intended recipient, you are hereby notified that any retention,
> > > dissemination, distribution, or copying of this communication is
> strictly
> > > prohibited. Please reply to the sender that you have received the
> message
> > > in error and destroy the original message and all copies.
> > >
> > > _______________________________________________
> > >
> >
> >
> >
> > --
> > --- Get your facts first, then you can distort them as you please.--
>
> > _______________________________________________
> > Flask mailing list
> > Flask at python.org
> > https://mail.python.org/mailman/listinfo/flask
>
>


-- 
--- Get your facts first, then you can distort them as you please.--
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170707/67cbb204/attachment.html>

From gergely at polonkai.eu  Fri Jul  7 08:59:43 2017
From: gergely at polonkai.eu (Gergely Polonkai)
Date: Fri, 07 Jul 2017 12:59:43 +0000
Subject: [Flask] flask queue question
In-Reply-To: <20170707125423.GG4010@raddish>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
 <20170707125423.GG4010@raddish>
Message-ID: <CACczBU+No000W_LkpBAo5wY6WqXj8v+1ELi0MmRdiNAaYPDUFw@mail.gmail.com>

If you use an HTTP server, like nginx or Apache httpd, the story changes a
lot. In that case, it?s the HTTP server that handles the connection and the
requests. When the request is received, it is forwarded to the Flask app,
usually through a WSGI layer like uWSGI or Apache?s mod_wsgi.

On Fri, Jul 7, 2017, 14:54 Adil Hasan <paradox2005 at gmail.com> wrote:

> Hello Rita,
> I wonder. Do you think that the nginx server is handling the requests?
> I think the webserver is the service that will manage requests. At least
> I think that it is.
> hth
> adil
>
> On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
> > yes, i understand that. how come when i submit ten concurrent requests
> none
> > of them get lost and eventually finish? how is that maintained?
> >
> > On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <amriabdesslem at gmail.com>
> > wrote:
> >
> > > Using the simple app.run() from within Flask creates a single
> synchronous
> > > server on a single thread capable of serving only one client at a time.
> > >
> > > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
> > >
> > >> Been using flask in my lab for the past few years. It just works. We
> > >> recently got some grad students and it seems we are seeing some
> slowness in
> > >> our flask applications running on Windows 2012 with enthought python.
> > >>
> > >> currently I am running it in a single threaded mode with nginx (
> > >>
> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#proxy-setups).
> > >> My question is: When 2 users hit my flask page, does it get blocked
> until
> > >> the first user finishes his request - it seems that the case. Is
> there a
> > >> way to view the "queue" length? How is this queue maintained, or is
> it done
> > >> by operating system networking stack?
> > >>
> > >>
> > >>
> > >> --
> > >> --- Get your facts first, then you can distort them as you please.--
> > >>
> > >> _______________________________________________
> > >> Flask mailing list
> > >> Flask at python.org
> > >> https://mail.python.org/mailman/listinfo/flask
> > >>
> > >>
> > >
> > >
> > > --
> > > ------------------------------
> > >
> > > The preceding message (including attachments) is covered by the
> Electronic
> > > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended
> only
> > > for the person or entity to which it is addressed, and may contain
> > > information that is confidential, protected by attorney-client or other
> > > privilege, or otherwise protected from disclosure by law. If you are
> not
> > > the intended recipient, you are hereby notified that any retention,
> > > dissemination, distribution, or copying of this communication is
> strictly
> > > prohibited. Please reply to the sender that you have received the
> message
> > > in error and destroy the original message and all copies.
> > >
> > > _______________________________________________
> > >
> >
> >
> >
> > --
> > --- Get your facts first, then you can distort them as you please.--
>
> > _______________________________________________
> > Flask mailing list
> > Flask at python.org
> > https://mail.python.org/mailman/listinfo/flask
>
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170707/b2d39b52/attachment-0001.html>

From paradox2005 at gmail.com  Fri Jul  7 09:07:10 2017
From: paradox2005 at gmail.com (Adil Hasan)
Date: Fri, 7 Jul 2017 14:07:10 +0100
Subject: [Flask] flask queue question
In-Reply-To: <CAOF-Kfj7+hdaSOUcACRqzEK7Miq9ygmyNy6YLkqw4KWHztKQkQ@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
 <20170707125423.GG4010@raddish>
 <CAOF-Kfj7+hdaSOUcACRqzEK7Miq9ygmyNy6YLkqw4KWHztKQkQ@mail.gmail.com>
Message-ID: <20170707130708.GH4010@raddish>

Hello Rita,
I'm afraid I'm not familiar with Windows. I noticed you're running nginx
in single-threaded mode. I think you may be able to configure the number
of workers so you can have more requests handled at one time. I'm afraid
I've not used nginx yet (I really should have a bash at it), but I am
certain more able people on this list will be able to help you.
I very much hope your day goes well,
adil

On Fri, Jul 07, 2017 at 08:56:59AM -0400, Rita wrote:
> yeah, my traffic is going thru nginx. Its acting as a proxy. Can you
> recommend a good wsgi server for windows?
> 
> On Fri, Jul 7, 2017 at 8:54 AM, Adil Hasan <paradox2005 at gmail.com> wrote:
> 
> > Hello Rita,
> > I wonder. Do you think that the nginx server is handling the requests?
> > I think the webserver is the service that will manage requests. At least
> > I think that it is.
> > hth
> > adil
> >
> > On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
> > > yes, i understand that. how come when i submit ten concurrent requests
> > none
> > > of them get lost and eventually finish? how is that maintained?
> > >
> > > On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <amriabdesslem at gmail.com>
> > > wrote:
> > >
> > > > Using the simple app.run() from within Flask creates a single
> > synchronous
> > > > server on a single thread capable of serving only one client at a time.
> > > >
> > > > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
> > > >
> > > >> Been using flask in my lab for the past few years. It just works. We
> > > >> recently got some grad students and it seems we are seeing some
> > slowness in
> > > >> our flask applications running on Windows 2012 with enthought python.
> > > >>
> > > >> currently I am running it in a single threaded mode with nginx (
> > > >> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#
> > proxy-setups).
> > > >> My question is: When 2 users hit my flask page, does it get blocked
> > until
> > > >> the first user finishes his request - it seems that the case. Is
> > there a
> > > >> way to view the "queue" length? How is this queue maintained, or is
> > it done
> > > >> by operating system networking stack?
> > > >>
> > > >>
> > > >>
> > > >> --
> > > >> --- Get your facts first, then you can distort them as you please.--
> > > >>
> > > >> _______________________________________________
> > > >> Flask mailing list
> > > >> Flask at python.org
> > > >> https://mail.python.org/mailman/listinfo/flask
> > > >>
> > > >>
> > > >
> > > >
> > > > --
> > > > ------------------------------
> > > >
> > > > The preceding message (including attachments) is covered by the
> > Electronic
> > > > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended
> > only
> > > > for the person or entity to which it is addressed, and may contain
> > > > information that is confidential, protected by attorney-client or other
> > > > privilege, or otherwise protected from disclosure by law. If you are
> > not
> > > > the intended recipient, you are hereby notified that any retention,
> > > > dissemination, distribution, or copying of this communication is
> > strictly
> > > > prohibited. Please reply to the sender that you have received the
> > message
> > > > in error and destroy the original message and all copies.
> > > >
> > > > _______________________________________________
> > > >
> > >
> > >
> > >
> > > --
> > > --- Get your facts first, then you can distort them as you please.--
> >
> > > _______________________________________________
> > > Flask mailing list
> > > Flask at python.org
> > > https://mail.python.org/mailman/listinfo/flask
> >
> >
> 
> 
> -- 
> --- Get your facts first, then you can distort them as you please.--

From rmorgan466 at gmail.com  Fri Jul  7 09:35:57 2017
From: rmorgan466 at gmail.com (Rita)
Date: Fri, 7 Jul 2017 09:35:57 -0400
Subject: [Flask] flask queue question
In-Reply-To: <CACczBU+No000W_LkpBAo5wY6WqXj8v+1ELi0MmRdiNAaYPDUFw@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
 <20170707125423.GG4010@raddish>
 <CACczBU+No000W_LkpBAo5wY6WqXj8v+1ELi0MmRdiNAaYPDUFw@mail.gmail.com>
Message-ID: <CAOF-Kfga15Ub3=1=PtxKedTK=-EjUWYxYA_wLNoYPF-Vs7rzsA@mail.gmail.com>

Right, when the client makes a request it gets forward to flask app. But
the flask app is syncrnous so it will wait a long time. Ideally, I am
looking for a good uWSGI (high performance) on Windows.

On Fri, Jul 7, 2017 at 8:59 AM, Gergely Polonkai <gergely at polonkai.eu>
wrote:

> If you use an HTTP server, like nginx or Apache httpd, the story changes a
> lot. In that case, it?s the HTTP server that handles the connection and the
> requests. When the request is received, it is forwarded to the Flask app,
> usually through a WSGI layer like uWSGI or Apache?s mod_wsgi.
>
> On Fri, Jul 7, 2017, 14:54 Adil Hasan <paradox2005 at gmail.com> wrote:
>
>> Hello Rita,
>> I wonder. Do you think that the nginx server is handling the requests?
>> I think the webserver is the service that will manage requests. At least
>> I think that it is.
>> hth
>> adil
>>
>> On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
>> > yes, i understand that. how come when i submit ten concurrent requests
>> none
>> > of them get lost and eventually finish? how is that maintained?
>> >
>> > On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <amriabdesslem at gmail.com
>> >
>> > wrote:
>> >
>> > > Using the simple app.run() from within Flask creates a single
>> synchronous
>> > > server on a single thread capable of serving only one client at a
>> time.
>> > >
>> > > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
>> > >
>> > >> Been using flask in my lab for the past few years. It just works. We
>> > >> recently got some grad students and it seems we are seeing some
>> slowness in
>> > >> our flask applications running on Windows 2012 with enthought python.
>> > >>
>> > >> currently I am running it in a single threaded mode with nginx (
>> > >> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#
>> proxy-setups).
>> > >> My question is: When 2 users hit my flask page, does it get blocked
>> until
>> > >> the first user finishes his request - it seems that the case. Is
>> there a
>> > >> way to view the "queue" length? How is this queue maintained, or is
>> it done
>> > >> by operating system networking stack?
>> > >>
>> > >>
>> > >>
>> > >> --
>> > >> --- Get your facts first, then you can distort them as you please.--
>> > >>
>> > >> _______________________________________________
>> > >> Flask mailing list
>> > >> Flask at python.org
>> > >> https://mail.python.org/mailman/listinfo/flask
>> > >>
>> > >>
>> > >
>> > >
>> > > --
>> > > ------------------------------
>> > >
>> > > The preceding message (including attachments) is covered by the
>> Electronic
>> > > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended
>> only
>> > > for the person or entity to which it is addressed, and may contain
>> > > information that is confidential, protected by attorney-client or
>> other
>> > > privilege, or otherwise protected from disclosure by law. If you are
>> not
>> > > the intended recipient, you are hereby notified that any retention,
>> > > dissemination, distribution, or copying of this communication is
>> strictly
>> > > prohibited. Please reply to the sender that you have received the
>> message
>> > > in error and destroy the original message and all copies.
>> > >
>> > > _______________________________________________
>> > >
>> >
>> >
>> >
>> > --
>> > --- Get your facts first, then you can distort them as you please.--
>>
>> > _______________________________________________
>> > Flask mailing list
>> > Flask at python.org
>> > https://mail.python.org/mailman/listinfo/flask
>>
>> _______________________________________________
>> Flask mailing list
>> Flask at python.org
>> https://mail.python.org/mailman/listinfo/flask
>>
>


-- 
--- Get your facts first, then you can distort them as you please.--
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170707/4a32eb3b/attachment.html>

From coreybrett at gmail.com  Fri Jul  7 09:57:38 2017
From: coreybrett at gmail.com (Corey Boyle)
Date: Fri, 7 Jul 2017 09:57:38 -0400
Subject: [Flask] flask queue question
In-Reply-To: <CAOF-Kfga15Ub3=1=PtxKedTK=-EjUWYxYA_wLNoYPF-Vs7rzsA@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
 <20170707125423.GG4010@raddish>
 <CACczBU+No000W_LkpBAo5wY6WqXj8v+1ELi0MmRdiNAaYPDUFw@mail.gmail.com>
 <CAOF-Kfga15Ub3=1=PtxKedTK=-EjUWYxYA_wLNoYPF-Vs7rzsA@mail.gmail.com>
Message-ID: <CAD=ssw1JoS0x0ytg_TDLuVmhcjE7P2YOf0Wu0B98gmvcmj5s4w@mail.gmail.com>

mod_wsgi might be an option for you if you are willing to use Apache.

https://github.com/GrahamDumpleton/mod_wsgi/blob/develop/win32/README.rst

Otherwise, you might be better off setting up a Linux box.

__
Corey

On Jul 7, 2017 9:43 AM, "Rita" <rmorgan466 at gmail.com> wrote:

> Right, when the client makes a request it gets forward to flask app. But
> the flask app is syncrnous so it will wait a long time. Ideally, I am
> looking for a good uWSGI (high performance) on Windows.
>
> On Fri, Jul 7, 2017 at 8:59 AM, Gergely Polonkai <gergely at polonkai.eu>
> wrote:
>
>> If you use an HTTP server, like nginx or Apache httpd, the story changes
>> a lot. In that case, it?s the HTTP server that handles the connection and
>> the requests. When the request is received, it is forwarded to the Flask
>> app, usually through a WSGI layer like uWSGI or Apache?s mod_wsgi.
>>
>> On Fri, Jul 7, 2017, 14:54 Adil Hasan <paradox2005 at gmail.com> wrote:
>>
>>> Hello Rita,
>>> I wonder. Do you think that the nginx server is handling the requests?
>>> I think the webserver is the service that will manage requests. At least
>>> I think that it is.
>>> hth
>>> adil
>>>
>>> On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
>>> > yes, i understand that. how come when i submit ten concurrent requests
>>> none
>>> > of them get lost and eventually finish? how is that maintained?
>>> >
>>> > On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <
>>> amriabdesslem at gmail.com>
>>> > wrote:
>>> >
>>> > > Using the simple app.run() from within Flask creates a single
>>> synchronous
>>> > > server on a single thread capable of serving only one client at a
>>> time.
>>> > >
>>> > > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
>>> > >
>>> > >> Been using flask in my lab for the past few years. It just works. We
>>> > >> recently got some grad students and it seems we are seeing some
>>> slowness in
>>> > >> our flask applications running on Windows 2012 with enthought
>>> python.
>>> > >>
>>> > >> currently I am running it in a single threaded mode with nginx (
>>> > >> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#
>>> proxy-setups).
>>> > >> My question is: When 2 users hit my flask page, does it get blocked
>>> until
>>> > >> the first user finishes his request - it seems that the case. Is
>>> there a
>>> > >> way to view the "queue" length? How is this queue maintained, or is
>>> it done
>>> > >> by operating system networking stack?
>>> > >>
>>> > >>
>>> > >>
>>> > >> --
>>> > >> --- Get your facts first, then you can distort them as you please.--
>>> > >>
>>> > >> _______________________________________________
>>> > >> Flask mailing list
>>> > >> Flask at python.org
>>> > >> https://mail.python.org/mailman/listinfo/flask
>>> > >>
>>> > >>
>>> > >
>>> > >
>>> > > --
>>> > > ------------------------------
>>> > >
>>> > > The preceding message (including attachments) is covered by the
>>> Electronic
>>> > > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is intended
>>> only
>>> > > for the person or entity to which it is addressed, and may contain
>>> > > information that is confidential, protected by attorney-client or
>>> other
>>> > > privilege, or otherwise protected from disclosure by law. If you are
>>> not
>>> > > the intended recipient, you are hereby notified that any retention,
>>> > > dissemination, distribution, or copying of this communication is
>>> strictly
>>> > > prohibited. Please reply to the sender that you have received the
>>> message
>>> > > in error and destroy the original message and all copies.
>>> > >
>>> > > _______________________________________________
>>> > >
>>> >
>>> >
>>> >
>>> > --
>>> > --- Get your facts first, then you can distort them as you please.--
>>>
>>> > _______________________________________________
>>> > Flask mailing list
>>> > Flask at python.org
>>> > https://mail.python.org/mailman/listinfo/flask
>>>
>>> _______________________________________________
>>> Flask mailing list
>>> Flask at python.org
>>> https://mail.python.org/mailman/listinfo/flask
>>>
>>
>
>
> --
> --- Get your facts first, then you can distort them as you please.--
>
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170707/73bc1c89/attachment-0001.html>

From coreybrett at gmail.com  Fri Jul  7 18:51:12 2017
From: coreybrett at gmail.com (Corey Boyle)
Date: Fri, 7 Jul 2017 18:51:12 -0400
Subject: [Flask] flask queue question
In-Reply-To: <CAD=ssw1JoS0x0ytg_TDLuVmhcjE7P2YOf0Wu0B98gmvcmj5s4w@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
 <20170707125423.GG4010@raddish>
 <CACczBU+No000W_LkpBAo5wY6WqXj8v+1ELi0MmRdiNAaYPDUFw@mail.gmail.com>
 <CAOF-Kfga15Ub3=1=PtxKedTK=-EjUWYxYA_wLNoYPF-Vs7rzsA@mail.gmail.com>
 <CAD=ssw1JoS0x0ytg_TDLuVmhcjE7P2YOf0Wu0B98gmvcmj5s4w@mail.gmail.com>
Message-ID: <CAD=ssw3StPqDihSV+xfCg9OQSFKCCAFzDkzMtDSUVVvk1q00Cg@mail.gmail.com>

Rita,

I found the following article about deploying Django on IIS, purhaps you
could adapt it to your needs.

https://www.toptal.com/django/installing-django-on-iis-a-step-by-step-tutorial




__
Corey

On Jul 7, 2017 9:57 AM, "Corey Boyle" <coreybrett at gmail.com> wrote:

> mod_wsgi might be an option for you if you are willing to use Apache.
>
> https://github.com/GrahamDumpleton/mod_wsgi/blob/develop/win32/README.rst
>
> Otherwise, you might be better off setting up a Linux box.
>
> __
> Corey
>
> On Jul 7, 2017 9:43 AM, "Rita" <rmorgan466 at gmail.com> wrote:
>
>> Right, when the client makes a request it gets forward to flask app. But
>> the flask app is syncrnous so it will wait a long time. Ideally, I am
>> looking for a good uWSGI (high performance) on Windows.
>>
>> On Fri, Jul 7, 2017 at 8:59 AM, Gergely Polonkai <gergely at polonkai.eu>
>> wrote:
>>
>>> If you use an HTTP server, like nginx or Apache httpd, the story changes
>>> a lot. In that case, it?s the HTTP server that handles the connection and
>>> the requests. When the request is received, it is forwarded to the Flask
>>> app, usually through a WSGI layer like uWSGI or Apache?s mod_wsgi.
>>>
>>> On Fri, Jul 7, 2017, 14:54 Adil Hasan <paradox2005 at gmail.com> wrote:
>>>
>>>> Hello Rita,
>>>> I wonder. Do you think that the nginx server is handling the requests?
>>>> I think the webserver is the service that will manage requests. At least
>>>> I think that it is.
>>>> hth
>>>> adil
>>>>
>>>> On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
>>>> > yes, i understand that. how come when i submit ten concurrent
>>>> requests none
>>>> > of them get lost and eventually finish? how is that maintained?
>>>> >
>>>> > On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <
>>>> amriabdesslem at gmail.com>
>>>> > wrote:
>>>> >
>>>> > > Using the simple app.run() from within Flask creates a single
>>>> synchronous
>>>> > > server on a single thread capable of serving only one client at a
>>>> time.
>>>> > >
>>>> > > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
>>>> > >
>>>> > >> Been using flask in my lab for the past few years. It just works.
>>>> We
>>>> > >> recently got some grad students and it seems we are seeing some
>>>> slowness in
>>>> > >> our flask applications running on Windows 2012 with enthought
>>>> python.
>>>> > >>
>>>> > >> currently I am running it in a single threaded mode with nginx (
>>>> > >> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#
>>>> proxy-setups).
>>>> > >> My question is: When 2 users hit my flask page, does it get
>>>> blocked until
>>>> > >> the first user finishes his request - it seems that the case. Is
>>>> there a
>>>> > >> way to view the "queue" length? How is this queue maintained, or
>>>> is it done
>>>> > >> by operating system networking stack?
>>>> > >>
>>>> > >>
>>>> > >>
>>>> > >> --
>>>> > >> --- Get your facts first, then you can distort them as you
>>>> please.--
>>>> > >>
>>>> > >> _______________________________________________
>>>> > >> Flask mailing list
>>>> > >> Flask at python.org
>>>> > >> https://mail.python.org/mailman/listinfo/flask
>>>> > >>
>>>> > >>
>>>> > >
>>>> > >
>>>> > > --
>>>> > > ------------------------------
>>>> > >
>>>> > > The preceding message (including attachments) is covered by the
>>>> Electronic
>>>> > > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is
>>>> intended only
>>>> > > for the person or entity to which it is addressed, and may contain
>>>> > > information that is confidential, protected by attorney-client or
>>>> other
>>>> > > privilege, or otherwise protected from disclosure by law. If you
>>>> are not
>>>> > > the intended recipient, you are hereby notified that any retention,
>>>> > > dissemination, distribution, or copying of this communication is
>>>> strictly
>>>> > > prohibited. Please reply to the sender that you have received the
>>>> message
>>>> > > in error and destroy the original message and all copies.
>>>> > >
>>>> > > _______________________________________________
>>>> > >
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > --- Get your facts first, then you can distort them as you please.--
>>>>
>>>> > _______________________________________________
>>>> > Flask mailing list
>>>> > Flask at python.org
>>>> > https://mail.python.org/mailman/listinfo/flask
>>>>
>>>> _______________________________________________
>>>> Flask mailing list
>>>> Flask at python.org
>>>> https://mail.python.org/mailman/listinfo/flask
>>>>
>>>
>>
>>
>> --
>> --- Get your facts first, then you can distort them as you please.--
>>
>> _______________________________________________
>> Flask mailing list
>> Flask at python.org
>> https://mail.python.org/mailman/listinfo/flask
>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170707/b9d91df6/attachment.html>

From bdeluca at gmail.com  Sun Jul  9 09:32:21 2017
From: bdeluca at gmail.com (Ben De Luca)
Date: Sun, 09 Jul 2017 13:32:21 +0000
Subject: [Flask] flask queue question
In-Reply-To: <CAD=ssw3StPqDihSV+xfCg9OQSFKCCAFzDkzMtDSUVVvk1q00Cg@mail.gmail.com>
References: <CAOF-KfjJBFk3eqqZV91k5rZ91bHu8jgL8M94WGAGczMmrp1=ZQ@mail.gmail.com>
 <CAE1ZAF-8VA1Kr8hAUh_o_-XwK8H2yWFHAzQDmwQ00_qkk6QpnA@mail.gmail.com>
 <CAOF-Kfj54ka6wG60bGEtoRkO3WoGAPXaVKG2DqG59dS36megew@mail.gmail.com>
 <20170707125423.GG4010@raddish>
 <CACczBU+No000W_LkpBAo5wY6WqXj8v+1ELi0MmRdiNAaYPDUFw@mail.gmail.com>
 <CAOF-Kfga15Ub3=1=PtxKedTK=-EjUWYxYA_wLNoYPF-Vs7rzsA@mail.gmail.com>
 <CAD=ssw1JoS0x0ytg_TDLuVmhcjE7P2YOf0Wu0B98gmvcmj5s4w@mail.gmail.com>
 <CAD=ssw3StPqDihSV+xfCg9OQSFKCCAFzDkzMtDSUVVvk1q00Cg@mail.gmail.com>
Message-ID: <CAGC__DgQDZKphB-R5T4TKpib1-u1gkPf6fdkMzh-HE9rLKgknw@mail.gmail.com>

Docker would be very easy. It's how we deploy our software on lin/win/Mac.
Don't have to think about what platform we are on then it's always Linux.

On Sat, 8 Jul 2017 at 1:51 am, Corey Boyle <coreybrett at gmail.com> wrote:

> Rita,
>
> I found the following article about deploying Django on IIS, purhaps you
> could adapt it to your needs.
>
>
> https://www.toptal.com/django/installing-django-on-iis-a-step-by-step-tutorial
>
>
>
>
> __
>
> Corey
>
> On Jul 7, 2017 9:57 AM, "Corey Boyle" <coreybrett at gmail.com> wrote:
>
>> mod_wsgi might be an option for you if you are willing to use Apache.
>>
>> https://github.com/GrahamDumpleton/mod_wsgi/blob/develop/win32/README.rst
>>
>> Otherwise, you might be better off setting up a Linux box.
>>
>> __
>> Corey
>>
>> On Jul 7, 2017 9:43 AM, "Rita" <rmorgan466 at gmail.com> wrote:
>>
>>> Right, when the client makes a request it gets forward to flask app. But
>>> the flask app is syncrnous so it will wait a long time. Ideally, I am
>>> looking for a good uWSGI (high performance) on Windows.
>>>
>>> On Fri, Jul 7, 2017 at 8:59 AM, Gergely Polonkai <gergely at polonkai.eu>
>>> wrote:
>>>
>>>> If you use an HTTP server, like nginx or Apache httpd, the story
>>>> changes a lot. In that case, it?s the HTTP server that handles the
>>>> connection and the requests. When the request is received, it is forwarded
>>>> to the Flask app, usually through a WSGI layer like uWSGI or Apache?s
>>>> mod_wsgi.
>>>>
>>>> On Fri, Jul 7, 2017, 14:54 Adil Hasan <paradox2005 at gmail.com> wrote:
>>>>
>>>>> Hello Rita,
>>>>> I wonder. Do you think that the nginx server is handling the requests?
>>>>> I think the webserver is the service that will manage requests. At
>>>>> least
>>>>> I think that it is.
>>>>> hth
>>>>> adil
>>>>>
>>>>> On Fri, Jul 07, 2017 at 06:33:23AM -0400, Rita wrote:
>>>>> > yes, i understand that. how come when i submit ten concurrent
>>>>> requests none
>>>>> > of them get lost and eventually finish? how is that maintained?
>>>>> >
>>>>> > On Fri, Jul 7, 2017 at 3:19 AM, Abdesslem Amri <
>>>>> amriabdesslem at gmail.com>
>>>>> > wrote:
>>>>> >
>>>>> > > Using the simple app.run() from within Flask creates a single
>>>>> synchronous
>>>>> > > server on a single thread capable of serving only one client at a
>>>>> time.
>>>>> > >
>>>>> > > 2017-07-07 3:02 GMT+02:00 Rita <rmorgan466 at gmail.com>:
>>>>> > >
>>>>> > >> Been using flask in my lab for the past few years. It just works.
>>>>> We
>>>>> > >> recently got some grad students and it seems we are seeing some
>>>>> slowness in
>>>>> > >> our flask applications running on Windows 2012 with enthought
>>>>> python.
>>>>> > >>
>>>>> > >> currently I am running it in a single threaded mode with nginx (
>>>>> > >>
>>>>> http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/#proxy-setups
>>>>> ).
>>>>> > >> My question is: When 2 users hit my flask page, does it get
>>>>> blocked until
>>>>> > >> the first user finishes his request - it seems that the case. Is
>>>>> there a
>>>>> > >> way to view the "queue" length? How is this queue maintained, or
>>>>> is it done
>>>>> > >> by operating system networking stack?
>>>>> > >>
>>>>> > >>
>>>>> > >>
>>>>> > >> --
>>>>> > >> --- Get your facts first, then you can distort them as you
>>>>> please.--
>>>>> > >>
>>>>> > >> _______________________________________________
>>>>> > >> Flask mailing list
>>>>> > >> Flask at python.org
>>>>> > >> https://mail.python.org/mailman/listinfo/flask
>>>>> > >>
>>>>> > >>
>>>>> > >
>>>>> > >
>>>>> > > --
>>>>> > > ------------------------------
>>>>> > >
>>>>> > > The preceding message (including attachments) is covered by the
>>>>> Electronic
>>>>> > > Communication Privacy Act, 18 U.S.C. sections 2510-2512, is
>>>>> intended only
>>>>> > > for the person or entity to which it is addressed, and may contain
>>>>> > > information that is confidential, protected by attorney-client or
>>>>> other
>>>>> > > privilege, or otherwise protected from disclosure by law. If you
>>>>> are not
>>>>> > > the intended recipient, you are hereby notified that any retention,
>>>>> > > dissemination, distribution, or copying of this communication is
>>>>> strictly
>>>>> > > prohibited. Please reply to the sender that you have received the
>>>>> message
>>>>> > > in error and destroy the original message and all copies.
>>>>> > >
>>>>> > > _______________________________________________
>>>>> > >
>>>>> >
>>>>> >
>>>>> >
>>>>> > --
>>>>> > --- Get your facts first, then you can distort them as you please.--
>>>>>
>>>>> > _______________________________________________
>>>>> > Flask mailing list
>>>>> > Flask at python.org
>>>>> > https://mail.python.org/mailman/listinfo/flask
>>>>>
>>>>> _______________________________________________
>>>>> Flask mailing list
>>>>> Flask at python.org
>>>>> https://mail.python.org/mailman/listinfo/flask
>>>>>
>>>>
>>>
>>>
>>> --
>>> --- Get your facts first, then you can distort them as you please.--
>>>
>>> _______________________________________________
>>> Flask mailing list
>>> Flask at python.org
>>> https://mail.python.org/mailman/listinfo/flask
>>>
>>> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170709/1ed57626/attachment.html>

From deepakpjose at gmail.com  Mon Jul 10 04:10:45 2017
From: deepakpjose at gmail.com (Deepak Jose)
Date: Mon, 10 Jul 2017 13:40:45 +0530
Subject: [Flask] Why flask.run() is not for production environment
Message-ID: <CAHUKbEM+OL_dOdvnXq+nvSofQekdFti91Jmmu8+1=TbhkD3pQw@mail.gmail.com>

Hi Team,

Can someone explain me why run() is not good for production environment?
All the examples I have seen for flask use run. Can someone help me to
understand why it is not recommended and
how we have to deploy our app then? The :ref:'deployment' can be found
where?

Excerpts from flask documentation for run:

def run(self, host=None, port=None, debug=None, **options):
"""Runs the application on a local development server.

*Do not use ``run()`` in a production setting. It is not intended to*
*meet security and performance requirements for a production server.*


*Instead, see :ref:`deployment` for WSGI server recommendations.*Thanks,
Deepak
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170710/402d7b42/attachment.html>

From me at samuelharmer.com  Mon Jul 10 04:19:22 2017
From: me at samuelharmer.com (Samuel Harmer)
Date: Mon, 10 Jul 2017 09:19:22 +0100
Subject: [Flask] Why flask.run() is not for production environment
In-Reply-To: <CAHUKbEM+OL_dOdvnXq+nvSofQekdFti91Jmmu8+1=TbhkD3pQw@mail.gmail.com>
References: <CAHUKbEM+OL_dOdvnXq+nvSofQekdFti91Jmmu8+1=TbhkD3pQw@mail.gmail.com>
Message-ID: <CA+fn190BjNzJRjXU2YYTXvK-s5GrpURAu+LBGQLDVK_CL6FFXw@mail.gmail.com>

Dear Deepak,

A quick Google for "flask deployment wsgi" gets you to
http://flask.pocoo.org/docs/0.12/deploying/ which describes a number of
options. In short, serving fast and safe HTTP to the www is a significant
challenge. `.run()` works but has not had the same effort put into www
engineering than dedicated web server projects have.

Kind regards,
Samuel Harmer

On 10 July 2017 at 09:10, Deepak Jose <deepakpjose at gmail.com> wrote:

> Hi Team,
>
> Can someone explain me why run() is not good for production environment?
> All the examples I have seen for flask use run. Can someone help me to
> understand why it is not recommended and
> how we have to deploy our app then? The :ref:'deployment' can be found
> where?
>
> Excerpts from flask documentation for run:
>
> def run(self, host=None, port=None, debug=None, **options):
> """Runs the application on a local development server.
>
> *Do not use ``run()`` in a production setting. It is not intended to*
> *meet security and performance requirements for a production server.*
>
>
> *Instead, see :ref:`deployment` for WSGI server recommendations.*Thanks,
> Deepak
>
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170710/f31cbc7b/attachment.html>

From gergely at polonkai.eu  Wed Jul 12 10:52:18 2017
From: gergely at polonkai.eu (Gergely Polonkai)
Date: Wed, 12 Jul 2017 14:52:18 +0000
Subject: [Flask] Flask Extension Development
In-Reply-To: <CAN_7BgiwEsA7YwxLTa6F0B99vqdVL59tY45njjxZ2Ms-d36cew@mail.gmail.com>
References: <CAN_7BgiB3gqkDjT4tiShZKF2MMAyZnZOneCiq-J=qN_eMKC-ww@mail.gmail.com>
 <CAE1ZAF853VC7-0ckcovQHomH-AOTJ6gsyRO7FobotT19zcT_6Q@mail.gmail.com>
 <CAN_7BgiPhAyTyku4BJcKdUGF+RvouF5+UWuF+SWEcaO0-Eek5g@mail.gmail.com>
 <CAN_7BgiwEsA7YwxLTa6F0B99vqdVL59tY45njjxZ2Ms-d36cew@mail.gmail.com>
Message-ID: <CACczBUJfxRdD1oM81x8pZ7mriiGyvGiurS84d9qBz9_ZFfHOpw@mail.gmail.com>

Hello Alena,

I just stumbled upon a library: Flask-JSGlue. This does pretty much what
you want to achieve, although it doesn?t do any filtering (so it exposes
everything). Maybe you should expand this instead of writing a new one.

Best,
Gergely

Alena Lifar <alenaslifar at gmail.com> ezt ?rta (id?pont: 2017. j?l. 5., Sze,
11:36):

> Hi Gergely,
>
> I completely agree that exposing all routes without an option of hiding
> some of them is a no-go. In my package you can use private() decorator func
> in order to hide either a route or a Blueprint. I have put some examples in
> the Readme:
>
> @private()@app.route('/restricted_route/')def private_endpoint():
>     return 'Hello Private Endpoint'
>
>
> As well as Blueprints:
>
> # or: app_bp = private(Blueprint('my_bp', __name__))
> app_bp = Blueprint('my_bp', __name__)
> private(app_bp)
>
>
> Does it correlate to your suggestion?
>
> My vision of requests with parameters was to just put those in the
> available url string as is (just like they were put in route()):
>
> "hello_world": {                              // name of a public endpoint
>         "active_urls": [
>             "/",
>             "/health_check/<int:customer_id>/"
>         ],
>         "methods": [
>             "GET",
>             "HEAD",
>             "OPTIONS"
>         ]
>     },
>
>
> By providing more information like required param format or an example of
> response format for a given route I think I'd create a vulnerability. I
> think that everything about data formats has to be in the API docs. This
> extension aimed to get rid of hardcoded api urls in the components/client
> code mostly...
>
> Please, let me know what you think.
>
> P.S. I'm quite new to contributing something valuable to the open-source.
> Could you please suggest me any resources that I might share my work with?
>
> Thank you for your help and for the feedback.
>
> Kind regards,
> Alena
>
> On Wed, Jul 5, 2017 at 11:34 AM, Alena Lifar <alenaslifar at gmail.com>
> wrote:
>
>> Hi Abdesslem,
>>
>> Awesome, thanks!
>>
>> Kind regards,
>> Alena
>>
>> On Wed, Jul 5, 2017 at 9:31 AM, Abdesslem Amri <amriabdesslem at gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> To add a new extension. you have to make a pull request to
>>> https://github.com/pallets/flask-website.
>>>
>>> Best regards,
>>> Abdesslem Amri
>>>
>>
>>> 2017-07-04 22:45 GMT+02:00 Alena Lifar <alenaslifar at gmail.com>:
>>>
>>>> Hello everyone,
>>>>
>>>> My name is Alena and I have been working on a Flask Extension that
>>>> collects and exposes routes declared in your Flask application/Blueprint
>>>> via REST.
>>>>
>>>> Here is Github project:
>>>> https://github.com/UseTheApi/flask_url_discovery
>>>>
>>>> Could anyone please take a look and let me know if this could be
>>>> useful? Do you think it has a chance to be added into Flask Extension
>>>> Registry? Is there anything I have to improve?
>>>>
>>>> I have found this link:
>>>> http://librelist.com/browser/flask/2010/7/25/flask-extension-review-status/ which
>>>> points to http://github.com/mitsuhiko/flask/tree/master/extreview/ for
>>>> Flask Extensions review and approval but this link is dead.
>>>>
>>>> Thank you for your time.
>>>>
>>>> Kind regards,
>>>> Alena
>>>>
>>>> _______________________________________________
>>>> Flask mailing list
>>>> Flask at python.org
>>>> https://mail.python.org/mailman/listinfo/flask
>>>>
>>>>
>>>
>>>
>>> --
>>> ------------------------------
>>>
>>> The preceding message (including attachments) is covered by the
>>> Electronic Communication Privacy Act, 18 U.S.C. sections 2510-2512, is
>>> intended only for the person or entity to which it is addressed, and may
>>> contain information that is confidential, protected by attorney-client or
>>> other privilege, or otherwise protected from disclosure by law. If you are
>>> not the intended recipient, you are hereby notified that any retention,
>>> dissemination, distribution, or copying of this communication is strictly
>>> prohibited. Please reply to the sender that you have received the message
>>> in error and destroy the original message and all copies.
>>>
>>> _______________________________________________
>>>
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170712/04ca600f/attachment.html>

From jgabriele at fastmail.fm  Mon Jul 17 14:58:06 2017
From: jgabriele at fastmail.fm (John Gabriele)
Date: Mon, 17 Jul 2017 14:58:06 -0400
Subject: [Flask] Tutorial, step 3: Installing flaskr as a package. Why?
Message-ID: <1500317886.2904836.1043757464.58204BE8@webmail.messagingengine.com>

Hi,

Reading the tutorial docs for Flask, I'm confused about step 3 of the
tutorial: [Installing flaskr as a
package](http://flask.pocoo.org/docs/0.12/tutorial/packaging/). This
step describes using setuptools to install my little webapp package into
my project's venv. Why would I want to do that? I can already run my
webapp without installing it --- it's just `flask run`. Why does this
part of the tutorial want me to install my webapp into my project's
venv?

Thanks,
-- John

From gergely at polonkai.eu  Tue Jul 18 03:01:35 2017
From: gergely at polonkai.eu (Gergely Polonkai)
Date: Tue, 18 Jul 2017 07:01:35 +0000
Subject: [Flask] Tutorial, step 3: Installing flaskr as a package. Why?
In-Reply-To: <1500317886.2904836.1043757464.58204BE8@webmail.messagingengine.com>
References: <1500317886.2904836.1043757464.58204BE8@webmail.messagingengine.com>
Message-ID: <CACczBUKnvY73nXB6C2V212bt8phZx+63tMjYYZzRT0_n2dhCxA@mail.gmail.com>

Actually, you don't have to. If you are creating a Flask based web
application, that will be run just by you, you can completely omit this
step.

However, if you are developing a Flask extension, and you want others to
use it, it's much easier for them to download it as a Python package.

Best,
Gergely

On Mon, Jul 17, 2017, 20:58 John Gabriele <jgabriele at fastmail.fm> wrote:

> Hi,
>
> Reading the tutorial docs for Flask, I'm confused about step 3 of the
> tutorial: [Installing flaskr as a
> package](http://flask.pocoo.org/docs/0.12/tutorial/packaging/). This
> step describes using setuptools to install my little webapp package into
> my project's venv. Why would I want to do that? I can already run my
> webapp without installing it --- it's just `flask run`. Why does this
> part of the tutorial want me to install my webapp into my project's
> venv?
>
> Thanks,
> -- John
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170718/199ddc10/attachment.html>

From jgabriele at fastmail.fm  Tue Jul 18 10:38:26 2017
From: jgabriele at fastmail.fm (John Gabriele)
Date: Tue, 18 Jul 2017 10:38:26 -0400
Subject: [Flask] Tutorial, step 3: Installing flaskr as a package. Why?
In-Reply-To: <CACczBUKnvY73nXB6C2V212bt8phZx+63tMjYYZzRT0_n2dhCxA@mail.gmail.com>
References: <1500317886.2904836.1043757464.58204BE8@webmail.messagingengine.com>
 <CACczBUKnvY73nXB6C2V212bt8phZx+63tMjYYZzRT0_n2dhCxA@mail.gmail.com>
Message-ID: <1500388706.4046314.1044690760.43FB0923@webmail.messagingengine.com>

Thanks, Gergely. Created <https://github.com/pallets/flask/issues/2421>.

On Tue, Jul 18, 2017, at 03:01 AM, Gergely Polonkai wrote:
> Actually, you don't have to. If you are creating a Flask based web application, that will be run just by you, you can completely omit this step.> However, if you are developing a Flask extension, and you want others to use it, it's much easier for them to download it as a Python package.> Best,
>  Gergely


> 
> On Mon, Jul 17, 2017, 20:58 John Gabriele <jgabriele at fastmail.fm> wrote:>> Hi,
>> 
>>  Reading the tutorial docs for Flask, I'm confused about step 3 of the>>  tutorial: [Installing flaskr as a
>>  package](http://flask.pocoo.org/docs/0.12/tutorial/packaging/). This>>  step describes using setuptools to install my little webapp package into>>  my project's venv. Why would I want to do that? I can already run my>>  webapp without installing it --- it's just `flask run`. Why does this>>  part of the tutorial want me to install my webapp into my project's>>  venv?
>> 
>>  Thanks,
>>  -- John
>>  _______________________________________________
>>  Flask mailing list
>> Flask at python.org
>> https://mail.python.org/mailman/listinfo/flask

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170718/dff5309b/attachment.html>

From gergely at polonkai.eu  Wed Jul 19 04:40:43 2017
From: gergely at polonkai.eu (Gergely Polonkai)
Date: Wed, 19 Jul 2017 08:40:43 +0000
Subject: [Flask] Ignored TypeError when my app is terminated
Message-ID: <CACczBUJv8P9KotYjj0tZyGsmfJyMYk6T6cCSe5N5mQBvcsqr3g@mail.gmail.com>

Hello,

this is half Python, half Flask question. I have a relatively big Flask app
(closed source, but I can share bits of the code if needed). It uses
Celery, which I suspect as the source of my problem (I think it started
appearing when we began using it).

I have a relatively complex manage.py script, which utilizes Flask-Script.
At some, seemingly random, occasions, I get the following traceback when a
command finishes:

Exception ignored in: <function
WeakValueDictionary.__init__.<locals>.remove at 0x7f8f4fd2df28>
Traceback (most recent call last):
  File "/usr/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable
Exception ignored in: <function
WeakValueDictionary.__init__.<locals>.remove at 0x7f8f4fd2df28>
Traceback (most recent call last):
  File "/usr/lib64/python3.5/weakref.py", line 117, in remove
TypeError: 'NoneType' object is not callable

I know such ignored exceptions can happen after a script exits, while
Python is destructing all the objects in memory. However, with such a stack
trace, it?s pretty hard to find what is exactly causing the problem.

Do any of you have an idea how to get to the bottom of this?

Best,
Gergely
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170719/169ab363/attachment.html>

From jgabriele at fastmail.fm  Thu Jul 20 12:14:09 2017
From: jgabriele at fastmail.fm (John Gabriele)
Date: Thu, 20 Jul 2017 12:14:09 -0400
Subject: [Flask] help getting hello world package-based webapp running
 without installing it
Message-ID: <1500567249.3242685.1047249344.36AA1C1D@webmail.messagingengine.com>

I'd like to get a simple hello-world Flask webapp running --- without
installing it yet --- but am having trouble. This is a package-based
webapp, as outlined in the Flask tutorial (like flaskr).

I've created:

my-proj/
    my-env/  # a venv with flask installed
    README.txt
    my_webapp/
        __init__.py  # empty
        my_webapp.py
        static/
            style.css
        templates/

my_webapp.py looks like:

~~~
from flask import Flask

app = Flask('my_webapp')

@app.route('/')
def index():
    return "Hi"
~~~

I have the venv activated.

My relevant environment variables are set:

    FLASK_APP=my_webapp.my_webapp
    FLASK_DEBUG=true

I was hoping to get this simplest case working, without adding anything
to __init__.py, and without installing my webapp package. I'd like to
run it on its dev server while developing. I can install/deploy later.
It's my understanding that this is the customary way to develop locally
with Flask.

In my-proj directory, and with my venv activated, if I try `flask run`,
it will run,

~~~
(my-env) my-proj$ flask run
 * Serving Flask app "my_webapp.my_webapp"
 * Forcing debug mode on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 924-462-254
~~~

but then when I access localhost:5000/ (which strips that last slash
after hit Enter), I get:

| flask.cli.NoAppException: The file/path provided (my_webapp.my_webapp)
does
| not appear to exist. Please verify the path is correct. If app is not
on PYTHONPATH,
| ensure the extension is .py

One thing that *does* work: if I instead run via `python -m flask run`,
I get

~~~
(my-env) my-proj$ python -m flask run
 * Serving Flask app "my_webapp.my_webapp"
 * Forcing debug mode on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
/usr/lib/python3.5/runpy.py:125: RuntimeWarning: 'flask.cli' found in
sys.modules after import of package 'flask', but prior to execution of
'flask.cli'; this may result in unpredictable behaviour
  warn(RuntimeWarning(msg))
 * Debugger is active!
 * Debugger PIN: 152-420-413
~~~

and I can load the page and it works. Why does that work but not plain
`flask run`?

Is something wrong in my `app = Flask(...)` arg, or in my env vars?

Is this the customary way to set up a Flask webapp (as a package) and
run it from the project directory?

Thanks!
-- John

From davidism at gmail.com  Thu Jul 20 12:27:19 2017
From: davidism at gmail.com (David Lord)
Date: Thu, 20 Jul 2017 09:27:19 -0700
Subject: [Flask] help getting hello world package-based webapp running
 without installing it
In-Reply-To: <1500567249.3242685.1047249344.36AA1C1D@webmail.messagingengine.com>
References: <1500567249.3242685.1047249344.36AA1C1D@webmail.messagingengine.com>
Message-ID: <CADtfqL7=P+MCci1L4kGc2pT8y7uKC9g0-OmjGefynk3n2y_5rg@mail.gmail.com>

The correct way to develop your application is by installing it as a
package, that's not just something for production, and it's why the
tutorial tells you to do it. The next release of Flask will allow
`FLASK_APP=package.inner` for some non-installed cases, but it's better to
just install the package. It works with `python -m flask` because that
implicitly adds the current directory to the Python path, which is not
something to rely on. For example, it would break if you ran from a
different directory.

Installing the package is not a big task, you create a `setup.py` file with
a couple lines then do `pip install -e .`.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170720/3d5afb61/attachment.html>

From jgabriele at fastmail.fm  Thu Jul 20 12:43:36 2017
From: jgabriele at fastmail.fm (John Gabriele)
Date: Thu, 20 Jul 2017 12:43:36 -0400
Subject: [Flask] help getting hello world package-based webapp running
 without installing it
In-Reply-To: <CADtfqL7=P+MCci1L4kGc2pT8y7uKC9g0-OmjGefynk3n2y_5rg@mail.gmail.com>
References: <1500567249.3242685.1047249344.36AA1C1D@webmail.messagingengine.com>
 <CADtfqL7=P+MCci1L4kGc2pT8y7uKC9g0-OmjGefynk3n2y_5rg@mail.gmail.com>
Message-ID: <1500569016.3248468.1047290272.5984EBD1@webmail.messagingengine.com>

On Thu, Jul 20, 2017, at 12:27 PM, David Lord wrote:
> The correct way to develop your application is by installing it as a package, that's not just something for production,
Ah! I understand now. And the `pip install --editable .` enables the installed package reloading --- had to re-read that part. Thanks!
-- John

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170720/a4663e13/attachment.html>

From thomas.david.vaughan at gmail.com  Thu Jul 27 00:51:32 2017
From: thomas.david.vaughan at gmail.com (Tom Vaughan)
Date: Thu, 27 Jul 2017 00:51:32 -0400
Subject: [Flask] Cannot get custom header value from request.headers
Message-ID: <CAH7xHdjEAEQyVqf10=J08UrNk8_rF4Vmc68tpR=45VPLio9wRA@mail.gmail.com>

Hi,

Why would this:

    print(request.headers)
    print(request.headers.get('Accept', 'No Accept'))
    print(request.headers.get('X-Real-Ip', 'No X-Real-Ip'))

cause this output:

    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Connection: keep-alive
    X-Real-Ip: 172.17.0.1
    [...]

    text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    No X-Real-Ip

?

Notice how X-Real-Ip and its value are printed when request.headers is
printed, yet the value of X-Real-Ip cannot be fetched from
requests.headers.

Thanks,
-Tom

From thomas.david.vaughan at gmail.com  Thu Jul 27 11:53:40 2017
From: thomas.david.vaughan at gmail.com (Tom Vaughan)
Date: Thu, 27 Jul 2017 11:53:40 -0400
Subject: [Flask] Cannot get custom header value from request.headers
In-Reply-To: <CAH7xHdjEAEQyVqf10=J08UrNk8_rF4Vmc68tpR=45VPLio9wRA@mail.gmail.com>
References: <CAH7xHdjEAEQyVqf10=J08UrNk8_rF4Vmc68tpR=45VPLio9wRA@mail.gmail.com>
Message-ID: <CAH7xHdjDKDpZZ2R-azA1Q4zkf1=1zv-gHjk5r2wdMo6VZvmOEw@mail.gmail.com>

On Thu, Jul 27, 2017 at 12:51 AM, Tom Vaughan
<thomas.david.vaughan at gmail.com> wrote:
> Hi,
>
> Why would this:
>
>     print(request.headers)
>     print(request.headers.get('Accept', 'No Accept'))
>     print(request.headers.get('X-Real-Ip', 'No X-Real-Ip'))
>
> cause this output:
>
>     Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
>     Connection: keep-alive
>     X-Real-Ip: 172.17.0.1
>     [...]
>
>     text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
>     No X-Real-Ip
>
> ?

So the problem is:

    File "/usr/local/lib/python3.5/dist-packages/werkzeug/datastructures.py",
line 1349, in __getitem__

        key = key.upper().replace('-', '_')
        if key in ('CONTENT_TYPE', 'CONTENT_LENGTH'):
            return _unicodify_header_value(self.environ[key])
        return _unicodify_header_value(self.environ['HTTP_' + key])

The problem is that the custom header values (those that start with
X-) are not capitalized in self.environ, everything else is. For
example in self.environ, Accept exists as HTTP_ACCEPT, but X-Real-Ip
exists as HTTP_X_Real_IP. But why?

From scott.werner.vt at gmail.com  Thu Jul 27 15:14:43 2017
From: scott.werner.vt at gmail.com (Scott Werner)
Date: Thu, 27 Jul 2017 15:14:43 -0400
Subject: [Flask] Cannot get custom header value from request.headers
In-Reply-To: <CAH7xHdjDKDpZZ2R-azA1Q4zkf1=1zv-gHjk5r2wdMo6VZvmOEw@mail.gmail.com>
References: <CAH7xHdjEAEQyVqf10=J08UrNk8_rF4Vmc68tpR=45VPLio9wRA@mail.gmail.com>
 <CAH7xHdjDKDpZZ2R-azA1Q4zkf1=1zv-gHjk5r2wdMo6VZvmOEw@mail.gmail.com>
Message-ID: <CAMtsL6iev_14WOn4b0DTwoPPX1FxiGanv0G469-FimfiBBDG8A@mail.gmail.com>

Tom,

Request headers key names are case-insensitive, so X-Real-Ip and X-REAL-IP
would both work. I could not repeat your issue using Python 3.6:

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route('/')
def hello_world():
    print(request.headers)
    print(request.headers.get('Accept', 'No Accept'))
    print(request.headers.get('X-Real-Ip', 'No X-Real-Ip'))
    print(request.headers.get('X-REAL-IP', 'No X-Real-Ip'))
    return jsonify(dict(request.headers))

app.run()


$ curl --header "X-Real-Ip: 8.8.8.8" http://127.0.0.1:5000/
{
  "Accept": "*/*",
  "Host": "127.0.0.1:5000",
  "User-Agent": "curl/7.54.1",
  "X-Real-Ip": "8.8.8.8"
}


127.0.0.1 - - [27/Jul/2017 15:12:18] "GET / HTTP/1.1" 200 -
Host: 127.0.0.1:5000
User-Agent: curl/7.54.1
Accept: */*
X-Real-Ip: 8.8.8.8


*/*
8.8.8.8
8.8.8.8



On Thu, Jul 27, 2017 at 11:53 AM, Tom Vaughan <
thomas.david.vaughan at gmail.com> wrote:

> On Thu, Jul 27, 2017 at 12:51 AM, Tom Vaughan
> <thomas.david.vaughan at gmail.com> wrote:
> > Hi,
> >
> > Why would this:
> >
> >     print(request.headers)
> >     print(request.headers.get('Accept', 'No Accept'))
> >     print(request.headers.get('X-Real-Ip', 'No X-Real-Ip'))
> >
> > cause this output:
> >
> >     Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;
> q=0.8
> >     Connection: keep-alive
> >     X-Real-Ip: 172.17.0.1
> >     [...]
> >
> >     text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
> >     No X-Real-Ip
> >
> > ?
>
> So the problem is:
>
>     File "/usr/local/lib/python3.5/dist-packages/werkzeug/
> datastructures.py",
> line 1349, in __getitem__
>
>         key = key.upper().replace('-', '_')
>         if key in ('CONTENT_TYPE', 'CONTENT_LENGTH'):
>             return _unicodify_header_value(self.environ[key])
>         return _unicodify_header_value(self.environ['HTTP_' + key])
>
> The problem is that the custom header values (those that start with
> X-) are not capitalized in self.environ, everything else is. For
> example in self.environ, Accept exists as HTTP_ACCEPT, but X-Real-Ip
> exists as HTTP_X_Real_IP. But why?
> _______________________________________________
> Flask mailing list
> Flask at python.org
> https://mail.python.org/mailman/listinfo/flask
>



-- 
Scott Werner
scott.werner.vt at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/flask/attachments/20170727/1a1fb3d6/attachment.html>

From thomas.david.vaughan at gmail.com  Thu Jul 27 15:54:17 2017
From: thomas.david.vaughan at gmail.com (Tom Vaughan)
Date: Thu, 27 Jul 2017 15:54:17 -0400
Subject: [Flask] Cannot get custom header value from request.headers
In-Reply-To: <CAMtsL6iev_14WOn4b0DTwoPPX1FxiGanv0G469-FimfiBBDG8A@mail.gmail.com>
References: <CAH7xHdjEAEQyVqf10=J08UrNk8_rF4Vmc68tpR=45VPLio9wRA@mail.gmail.com>
 <CAH7xHdjDKDpZZ2R-azA1Q4zkf1=1zv-gHjk5r2wdMo6VZvmOEw@mail.gmail.com>
 <CAMtsL6iev_14WOn4b0DTwoPPX1FxiGanv0G469-FimfiBBDG8A@mail.gmail.com>
Message-ID: <CAH7xHdjK71C-He4KuvuCGZJA-m+z0b_054Nx2krLgPALwT-NpA@mail.gmail.com>

Thanks Scott! I really appreciate that you've taken some time to look into this!

The problem seems to be with nginx/uwsgi/werkzeug. This is my current
work around: https://gitlab.com/tvaughan/docker-nginx-proxy-uwsgi/commit/646a22f279e665a3114baa581b3ba2c7ebfc1ad1.
This simply sends the custom headers in the format expected by
werkzeug when it looks up the keys in self.environment.

This issue https://github.com/pallets/werkzeug/issues/940 appears to
be related. My problem isn't with the same header being provided more
than once, but rather this issue does say there is some condition
which causes werkzeug to not coerce header names. I still don't know
what that condition is. Note that in my workaround Host is OK as-is.
Perhaps the condition is simply the X- prefix? Still diggin'...

Thanks,
-Tom



On Thu, Jul 27, 2017 at 3:14 PM, Scott Werner <scott.werner.vt at gmail.com> wrote:
> Tom,
>
> Request headers key names are case-insensitive, so X-Real-Ip and X-REAL-IP
> would both work. I could not repeat your issue using Python 3.6:
>
> from flask import Flask, jsonify, request
>
> app = Flask(__name__)
>
> @app.route('/')
> def hello_world():
>     print(request.headers)
>     print(request.headers.get('Accept', 'No Accept'))
>     print(request.headers.get('X-Real-Ip', 'No X-Real-Ip'))
>     print(request.headers.get('X-REAL-IP', 'No X-Real-Ip'))
>     return jsonify(dict(request.headers))
>
> app.run()
>
>
> $ curl --header "X-Real-Ip: 8.8.8.8" http://127.0.0.1:5000/
> {
>   "Accept": "*/*",
>   "Host": "127.0.0.1:5000",
>   "User-Agent": "curl/7.54.1",
>   "X-Real-Ip": "8.8.8.8"
> }
>
>
> 127.0.0.1 - - [27/Jul/2017 15:12:18] "GET / HTTP/1.1" 200 -
> Host: 127.0.0.1:5000
> User-Agent: curl/7.54.1
> Accept: */*
> X-Real-Ip: 8.8.8.8
>
>
> */*
> 8.8.8.8
> 8.8.8.8
>
>
>
> On Thu, Jul 27, 2017 at 11:53 AM, Tom Vaughan
> <thomas.david.vaughan at gmail.com> wrote:
>>
>> On Thu, Jul 27, 2017 at 12:51 AM, Tom Vaughan
>> <thomas.david.vaughan at gmail.com> wrote:
>> > Hi,
>> >
>> > Why would this:
>> >
>> >     print(request.headers)
>> >     print(request.headers.get('Accept', 'No Accept'))
>> >     print(request.headers.get('X-Real-Ip', 'No X-Real-Ip'))
>> >
>> > cause this output:
>> >
>> >     Accept:
>> > text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
>> >     Connection: keep-alive
>> >     X-Real-Ip: 172.17.0.1
>> >     [...]
>> >
>> >     text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
>> >     No X-Real-Ip
>> >
>> > ?
>>
>> So the problem is:
>>
>>     File
>> "/usr/local/lib/python3.5/dist-packages/werkzeug/datastructures.py",
>> line 1349, in __getitem__
>>
>>         key = key.upper().replace('-', '_')
>>         if key in ('CONTENT_TYPE', 'CONTENT_LENGTH'):
>>             return _unicodify_header_value(self.environ[key])
>>         return _unicodify_header_value(self.environ['HTTP_' + key])
>>
>> The problem is that the custom header values (those that start with
>> X-) are not capitalized in self.environ, everything else is. For
>> example in self.environ, Accept exists as HTTP_ACCEPT, but X-Real-Ip
>> exists as HTTP_X_Real_IP. But why?
>> _______________________________________________
>> Flask mailing list
>> Flask at python.org
>> https://mail.python.org/mailman/listinfo/flask
>
>
>
>
> --
> Scott Werner
> scott.werner.vt at gmail.com