ANN: urllib3 0.2 - HTTP library with thread-safe connection pooling and file posting support
Andrey Petrov
shazow at gmail.com
Sun Nov 30 23:29:11 CET 2008
Project website: http://code.google.com/p/urllib3/
Also available on pypi: http://pypi.python.org/pypi/urllib3
(Licensed under MIT)
Highlights
==========
* Re-use the same socket connection for multiple requests
(``HTTPConnectionPool``)
* File posting (``encode_multipart_formdata``)
* Built-in redirection and retries (optional)
* Thread-safe
What's wrong with urllib and urllib2?
=====================================
There are two critical features missing from the Python standard
library:
Connection re-using/pooling and file posting. It's not terribly hard
to
implement these yourself, but it's much easier to use a module that
already
did the work for you.
The Python standard libraries ``urllib`` and ``urllib2`` have little
to do
with each other. They were designed to be independent and standalone,
each
solving a different scope of problems, and ``urllib3`` follows in a
similar
vein.
Why do I want to reuse connections?
===================================
Performance. When you normally do a urllib call, a separate socket
connection is created with each request. By reusing existing sockets
(supported since HTTP 1.1), the requests will take up less resources
on the
server's end, and also provide a faster response time at the client's
end.
With some simple benchmarks (see `test/benchmark.py
<http://code.google.com/p/urllib3/source/browse/trunk/test/
benchmark.py>`_
), downloading 15 URLs from google.com is about twice as fast when
using
HTTPConnectionPool (which uses 1 connection) than using plain urllib
(which
uses 15 connections).
This library is perfect for:
* Talking to an API
* Crawling a website
* Any situation where being able to post files, handle redirection,
and
retrying is useful. It's relatively lightweight, so it can be used
for
anything!
Examples
========
Go to the `Examples wiki <http://code.google.com/p/urllib3/wiki/
Examples>`_
for more nice syntax-highlighted examples.
But, long story short::
from urllib3 import HTTPConnectionPool
API_URL = 'http://ajax.googleapis.com/ajax/services/search/web'
http_pool = HTTPConnectionPool.from_url(API_URL)
fields = {'v': '1.0', 'q': 'urllib3'}
r = http_pool.get_url(API_URL, fields)
print r.status, r.data
Enjoy! Feedback is very welcome, please send it to shazow at gmail.
- Andrey
P.S.
I apologize in advance for the potentially controversial name, but
after much consideration it turned out to be the most descriptive one
I could think of.
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