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======= urllib3 ======= .. image:: https://travis-ci.org/shazow/urllib3.png?branch=master :target: https://travis-ci.org/shazow/urllib3 .. image:: https://www.bountysource.com/badge/tracker?tracker_id=192525 :target: https://www.bountysource.com/trackers/192525-urllib3?utm_source=192525&utm_medium=shield&utm_campaign=TRACKER_BADGE Highlights ========== - Re-use the same socket connection for multiple requests (``HTTPConnectionPool`` and ``HTTPSConnectionPool``) (with optional client-side certificate verification). - File posting (``encode_multipart_formdata``). - Built-in redirection and retries (optional). - Supports gzip and deflate decoding. - Thread-safe and sanity-safe. - Works with AppEngine, gevent, and eventlib. - Tested on Python 2.6+, Python 3.2+, and PyPy, with 100% unit test coverage. - Small and easy to understand codebase perfect for extending and building upon. For a more comprehensive solution, have a look at `Requests <http://python-requests.org/>`_ which is also powered by ``urllib3``. You might already be using urllib3! =================================== ``urllib3`` powers `many great Python libraries <https://sourcegraph.com/search?q=package+urllib3>`_, including ``pip`` and ``requests``. 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 <https://github.com/shazow/urllib3/blob/master/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 `urllib3.readthedocs.org <http://urllib3.readthedocs.org>`_ for more nice syntax-highlighted examples. But, long story short:: import urllib3 http = urllib3.PoolManager() r = http.request('GET', 'http://google.com/') print r.status, r.data The ``PoolManager`` will take care of reusing connections for you whenever you request the same host. For more fine-grained control of your connection pools, you should look at `ConnectionPool <http://urllib3.readthedocs.org/#connectionpool>`_. Run the tests ============= We use some external dependencies, multiple interpreters and code coverage analysis while running test suite. Our ``Makefile`` handles much of this for you as long as you're running it `inside of a virtualenv <http://docs.python-guide.org/en/latest/dev/virtualenvs/>`_:: $ make test [... magically installs dependencies and runs tests on your virtualenv] Ran 182 tests in 1.633s OK (SKIP=6) Note that code coverage less than 100% is regarded as a failing run. Some platform-specific tests are skipped unless run in that platform. To make sure the code works in all of urllib3's supported platforms, you can run our ``tox`` suite:: $ make test-all [... tox creates a virtualenv for every platform and runs tests inside of each] py26: commands succeeded py27: commands succeeded py32: commands succeeded py33: commands succeeded py34: commands succeeded Our test suite `runs continuously on Travis CI <https://travis-ci.org/shazow/urllib3>`_ with every pull request. Contributing ============ #. `Check for open issues <https://github.com/shazow/urllib3/issues>`_ or open a fresh issue to start a discussion around a feature idea or a bug. There is a *Contributor Friendly* tag for issues that should be ideal for people who are not very familiar with the codebase yet. #. Fork the `urllib3 repository on Github <https://github.com/shazow/urllib3>`_ to start making your changes. #. Write a test which shows that the bug was fixed or that the feature works as expected. #. Send a pull request and bug the maintainer until it gets merged and published. :) Make sure to add yourself to ``CONTRIBUTORS.txt``. Sponsorship =========== If your company benefits from this library, please consider `sponsoring its development <http://urllib3.readthedocs.org/en/latest/#sponsorship>`_.
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