diff options
Diffstat (limited to 'docs/index.rst')
| -rw-r--r-- | docs/index.rst | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/docs/index.rst b/docs/index.rst new file mode 100644 index 0000000..1fc8a9c --- /dev/null +++ b/docs/index.rst @@ -0,0 +1,340 @@ +===================== +urllib3 Documentation +===================== + +.. toctree:: + :hidden: + + pools + managers + security + helpers + collections + contrib + + +Highlights +========== + +- Re-use the same socket connection for multiple requests, with optional + client-side certificate verification. See: + :class:`~urllib3.connectionpool.HTTPConnectionPool` and + :class:`~urllib3.connectionpool.HTTPSConnectionPool` + +- File posting. See: + :func:`~urllib3.filepost.encode_multipart_formdata` + +- Built-in redirection and retries (optional). + +- Supports gzip and deflate decoding. See: + :func:`~urllib3.response.decode_gzip` and + :func:`~urllib3.response.decode_deflate` + +- Thread-safe and sanity-safe. + +- Tested on Python 2.6+ and Python 3.2+, 100% unit test coverage. + +- Works with AppEngine, gevent, eventlib, and the standard library :mod:`io` module. + +- 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. + + +Getting Started +=============== + +Installing +---------- + +``pip install urllib3`` or fetch the latest source from +`github.com/shazow/urllib3 <https://github.com/shazow/urllib3>`_. + +Usage +----- + +.. doctest :: + + >>> import urllib3 + >>> http = urllib3.PoolManager() + >>> r = http.request('GET', 'http://example.com/') + >>> r.status + 200 + >>> r.headers['server'] + 'ECS (iad/182A)' + >>> 'data: ' + r.data + 'data: ...' + + +**By default, urllib3 does not verify your HTTPS requests**. +You'll need to supply a root certificate bundle, or use `certifi +<https://certifi.io/>`_ + +.. doctest :: + + >>> import urllib3, certifi + >>> http = urllib3.PoolManager(cert_reqs='CERT_REQUIRED', ca_certs=certifi.where()) + >>> r = http.request('GET', 'https://insecure.com/') + Traceback (most recent call last): + ... + SSLError: hostname 'insecure.com' doesn't match 'svn.nmap.org' + +For more on making secure SSL/TLS HTTPS requests, read the :ref:`Security +section <security>`. + + +urllib3's responses respect the :mod:`io` framework from Python's +standard library, allowing use of these standard objects for purposes +like buffering: + +.. doctest :: + + >>> http = urllib3.PoolManager() + >>> r = http.urlopen('GET','http://example.com/', preload_content=False) + >>> b = io.BufferedReader(r, 2048) + >>> firstpart = b.read(100) + >>> # ... your internet connection fails momentarily ... + >>> secondpart = b.read() + + +Components +========== + +:mod:`urllib3` tries to strike a fine balance between power, extendability, and +sanity. To achieve this, the codebase is a collection of small reusable +utilities and abstractions composed together in a few helpful layers. + + +PoolManager +----------- + +The highest level is the :doc:`PoolManager(...) <managers>`. + +The :class:`~urllib3.poolmanagers.PoolManager` will take care of reusing +connections for you whenever you request the same host. This should cover most +scenarios without significant loss of efficiency, but you can always drop down +to a lower level component for more granular control. + +.. doctest :: + + >>> import urllib3 + >>> http = urllib3.PoolManager(10) + >>> r1 = http.request('GET', 'http://example.com/') + >>> r2 = http.request('GET', 'http://httpbin.org/') + >>> r3 = http.request('GET', 'http://httpbin.org/get') + >>> len(http.pools) + 2 + +A :class:`~urllib3.poolmanagers.PoolManager` is a proxy for a collection of +:class:`ConnectionPool` objects. They both inherit from +:class:`~urllib3.request.RequestMethods` to make sure that their API is +similar, so that instances of either can be passed around interchangeably. + + +ProxyManager +------------ + +The :class:`~urllib3.poolmanagers.ProxyManager` is an HTTP proxy-aware +subclass of :class:`~urllib3.poolmanagers.PoolManager`. It produces a single +:class:`~urllib3.connectionpool.HTTPConnectionPool` instance for all HTTP +connections and individual per-server:port +:class:`~urllib3.connectionpool.HTTPSConnectionPool` instances for tunnelled +HTTPS connections: + +:: + + >>> proxy = urllib3.ProxyManager('http://localhost:3128/') + >>> r1 = proxy.request('GET', 'http://google.com/') + >>> r2 = proxy.request('GET', 'http://httpbin.org/') + >>> len(proxy.pools) + 1 + >>> r3 = proxy.request('GET', 'https://httpbin.org/') + >>> r4 = proxy.request('GET', 'https://twitter.com/') + >>> len(proxy.pools) + 3 + + +ConnectionPool +-------------- + +The next layer is the :doc:`ConnectionPool(...) <pools>`. + +The :class:`~urllib3.connectionpool.HTTPConnectionPool` and +:class:`~urllib3.connectionpool.HTTPSConnectionPool` classes allow you to +define a pool of connections to a single host and make requests against this +pool with automatic **connection reusing** and **thread safety**. + +When the :mod:`ssl` module is available, then +:class:`~urllib3.connectionpool.HTTPSConnectionPool` objects can be configured +to check SSL certificates against specific provided certificate authorities. + +.. doctest :: + + >>> import urllib3 + >>> conn = urllib3.connection_from_url('http://httpbin.org/') + >>> r1 = conn.request('GET', 'http://httpbin.org/') + >>> r2 = conn.request('GET', '/user-agent') + >>> r3 = conn.request('GET', 'http://example.com') + Traceback (most recent call last): + ... + urllib3.exceptions.HostChangedError: HTTPConnectionPool(host='httpbin.org', port=None): Tried to open a foreign host with url: http://example.com + +Again, a ConnectionPool is a pool of connections to a specific host. Trying to +access a different host through the same pool will raise a ``HostChangedError`` +exception unless you specify ``assert_same_host=False``. Do this at your own +risk as the outcome is completely dependent on the behaviour of the host server. + +If you need to access multiple hosts and don't want to manage your own +collection of :class:`~urllib3.connectionpool.ConnectionPool` objects, then you +should use a :class:`~urllib3.poolmanager.PoolManager`. + +A :class:`~urllib3.connectionpool.ConnectionPool` is composed of a collection +of :class:`httplib.HTTPConnection` objects. + + +Timeout +------- + +A timeout can be set to abort socket operations on individual connections after +the specified duration. The timeout can be defined as a float or an instance of +:class:`~urllib3.util.timeout.Timeout` which gives more granular configuration +over how much time is allowed for different stages of the request. This can be +set for the entire pool or per-request. + +.. doctest :: + + >>> from urllib3 import PoolManager, Timeout + + >>> # Manager with 3 seconds combined timeout. + >>> http = PoolManager(timeout=3.0) + >>> r = http.request('GET', 'http://httpbin.org/delay/1') + + >>> # Manager with 2 second timeout for the read phase, no limit for the rest. + >>> http = PoolManager(timeout=Timeout(read=2.0)) + >>> r = http.request('GET', 'http://httpbin.org/delay/1') + + >>> # Manager with no timeout but a request with a timeout of 1 seconds for + >>> # the connect phase and 2 seconds for the read phase. + >>> http = PoolManager() + >>> r = http.request('GET', 'http://httpbin.org/delay/1', timeout=Timeout(connect=1.0, read=2.0)) + + >>> # Same Manager but request with a 5 second total timeout. + >>> r = http.request('GET', 'http://httpbin.org/delay/1', timeout=Timeout(total=5.0)) + +See the :class:`~urllib3.util.timeout.Timeout` definition for more details. + + +Retry +----- + +Retries can be configured by passing an instance of +:class:`~urllib3.util.retry.Retry`, or disabled by passing ``False``, to the +``retries`` parameter. + +Redirects are also considered to be a subset of retries but can be configured or +disabled individually. + +:: + + >>> from urllib3 import PoolManager, Retry + + >>> # Allow 3 retries total for all requests in this pool. These are the same: + >>> http = PoolManager(retries=3) + >>> http = PoolManager(retries=Retry(3)) + >>> http = PoolManager(retries=Retry(total=3)) + + >>> r = http.request('GET', 'http://httpbin.org/redirect/2') + >>> # r.status -> 200 + + >>> # Disable redirects for this request. + >>> r = http.request('GET', 'http://httpbin.org/redirect/2', retries=Retry(3, redirect=False)) + >>> # r.status -> 302 + + >>> # No total limit, but only do 5 connect retries, for this request. + >>> r = http.request('GET', 'http://httpbin.org/', retries=Retry(connect=5)) + + +See the :class:`~urllib3.util.retry.Retry` definition for more details. + + +Foundation +---------- + +At the very core, just like its predecessors, :mod:`urllib3` is built on top of +:mod:`httplib` -- the lowest level HTTP library included in the Python +standard library. + +To aid the limited functionality of the :mod:`httplib` module, :mod:`urllib3` +provides various helper methods which are used with the higher level components +but can also be used independently. + +.. toctree:: + + helpers + exceptions + + +Contrib Modules +--------------- + +These modules implement various extra features, that may not be ready for +prime time. + +.. toctree:: + + contrib + + +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 +=========== + +Please consider sponsoring urllib3 development, especially if your company +benefits from this library. + +* **Project Grant**: A grant for contiguous full-time development has the + biggest impact for progress. Periods of 3 to 10 days allow a contributor to + tackle substantial complex issues which are otherwise left to linger until + somebody can't afford to not fix them. + + Contact `@shazow <https://github.com/shazow>`_ to arrange a grant for a core + contributor. + +* **One-off**: Development will continue regardless of funding, but donations help move + things further along quicker as the maintainer can allocate more time off to + work on urllib3 specifically. + + .. raw:: html + + <a href="https://donorbox.org/personal-sponsor-urllib3" style="background-color:#1275ff;color:#fff;text-decoration:none;font-family:Verdana,sans-serif;display:inline-block;font-size:14px;padding:7px 16px;border-radius:5px;margin-right:2em;vertical-align:top;border:1px solid rgba(160,160,160,0.5);background-image:linear-gradient(#7dc5ee,#008cdd 85%,#30a2e4);box-shadow:inset 0 1px 0 rgba(255,255,255,0.25);">Sponsor with Credit Card</a> + + <a class="coinbase-button" data-code="137087702cf2e77ce400d53867b164e6" href="https://coinbase.com/checkouts/137087702cf2e77ce400d53867b164e6">Sponsor with Bitcoin</a><script src="https://coinbase.com/assets/button.js" type="text/javascript"></script> + +* **Recurring**: You're welcome to `support the maintainer on Gittip + <https://www.gittip.com/shazow/>`_. + + +Recent Sponsors +--------------- + +Huge thanks to all the companies and individuals who financially contributed to +the development of urllib3. Please send a PR if you've donated and would like +to be listed. + +* `Stripe <https://stripe.com/>`_ (June 23, 2014) + +.. * [Company] ([optional tagline]), [optional description of grant] ([date]) |