XML RPC changes between 3.7 and 3.9 yield 401 http error

[lucas]

And, in my outputs, a key part is missing: the received arguments as 
parsed by Flask:

Python 3.7:
     REQUEST: ImmutableMultiDict([('u', 'user'), ('p', 'password')])

Python 3.9:
     REQUEST: ImmutableMultiDict([])


Have a good day everyone,
--lucas


On 27/03/2021 18:53, lucas wrote:
> Following our previous discussion:
>      https://www.talkend.net/post/287193.html
> 
> I finally took time (thanks to Florian R.) to get a reproducible example 
> of my problem, as asked previously by ChrisA.
> 
> The following code is implementing a webserver with Flask, and a client 
> with the XMLRPC client:
> 
>      import sys
>      from xmlrpc import server, client
>      from urllib.parse import urlencode
>      from flask import Flask, request
> 
> 
>      PORT = 23456
>      USER, PASSWD = 'user', 'password'
>      URL = '127.0.0.1:' + str(PORT)
> 
>      if len(sys.argv) > 1 and sys.argv[1] == 'server':
>          app = Flask(__name__)
>          @app.route('/', methods=['POST'])
>          @app.route('/RPC2', methods=['POST'])
>          def login():
>              print('REQUEST:', request.args)
>              return 'ok'
>          app.run(debug=True, host='localhost', port=PORT)
> 
>      else:
>          url = 'http://' + URL + '?' + urlencode({'u': USER, 'p': PASSWD})
>          print(url)
>          proxy = client.ServerProxy(url)
>          print(proxy, dir(proxy))
>          print(proxy.add(2, 3))
> 
> 
> You can run the client with `python3 p.py`, and the server with `python3 
> p.py server`.
> 
> On debian, Python 3.7, i got:
> 
>      lucas at debianserver:~$ python3.7 p.py server
>       * Serving Flask app "p" (lazy loading)
>       * Environment: production
>         WARNING: This is a development server. Do not use it in a 
> production deployment.
>         Use a production WSGI server instead.
>       * Debug mode: on
>       * Running on http://localhost:23456/ (Press CTRL+C to quit)
>       * Restarting with stat
>       * Debugger is active!
>       * Debugger PIN: 249-992-288
>      127.0.0.1 - - [27/Mar/2021 18:31:13] "POST /?u=user&p=password 
> HTTP/1.1" 404 -
> 
> 
> On Arch, python 3.9, i got:
> 
>       aluriak at arch❯ python3.9 p.py server
>       * Serving Flask app "p" (lazy loading)
>       * Environment: production
>         WARNING: This is a development server. Do not use it in a 
> production deployment.
>         Use a production WSGI server instead.
>       * Debug mode: on
>       * Running on http://localhost:23456/ (Press CTRL+C to quit)
>       * Restarting with stat
>       * Debugger is active!
>       * Debugger PIN: 821-276-100
>      127.0.0.1 - - [27/Mar/2021 18:35:45] "POST /RPC2 HTTP/1.1" 200 -
> 
> 
> Both systems return the same output on command `pip3 freeze | grep 
> Flask`, which is `Flask==1.1.2`.
> 
> 
> Note that the two outputs differs in two ways:
> 
>      127.0.0.1 - - [27/Mar/2021 18:31:13] "POST /?u=user&p=password 
> HTTP/1.1" 404 -
>      127.0.0.1 - - [27/Mar/2021 18:35:45] "POST /RPC2 HTTP/1.1" 200 -
> 
> The first contains the arguments, and the second contains the path. 
> Sounds like there is something wrong with both modules.
> 
> This should be a reproducible example ; plus i'm not the only one to 
> encounter that problem:
>      
> https://github.com/kynan/dokuwikixmlrpc/issues/8#issuecomment-808755244
> 
> Best regards,
> --lucas