cpython/Doc/library/http.client.rst

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:mod:`http.client` --- HTTP protocol client
===========================================
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.. module:: http.client
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:synopsis: HTTP and HTTPS protocol client (requires sockets).
.. index::
pair: HTTP; protocol
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single: HTTP; http.client (standard module)
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.. index:: module: urllib.request
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**Source code:** :source:`Lib/http/client.py`
--------------
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This module defines classes which implement the client side of the HTTP and
HTTPS protocols. It is normally not used directly --- the module
:mod:`urllib.request` uses it to handle URLs that use HTTP and HTTPS.
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.. seealso::
The `Requests package <http://requests.readthedocs.org/>`_
is recommended for a higher-level http client interface.
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.. note::
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HTTPS support is only available if Python was compiled with SSL support
(through the :mod:`ssl` module).
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The module provides the following classes:
.. class:: HTTPConnection(host, port=None[, timeout], \
source_address=None)
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An :class:`HTTPConnection` instance represents one transaction with an HTTP
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server. It should be instantiated passing it a host and optional port
number. If no port number is passed, the port is extracted from the host
string if it has the form ``host:port``, else the default HTTP port (80) is
used. If the optional *timeout* parameter is given, blocking
Merged revisions 62998-63003,63005-63006,63009-63012,63014-63017,63019-63020,63022-63024,63026-63029,63031-63041,63043-63045,63047-63054,63056-63062 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r62998 | andrew.kuchling | 2008-05-10 15:51:55 -0400 (Sat, 10 May 2008) | 7 lines #1858 from Tarek Ziade: Allow multiple repositories in .pypirc; see http://wiki.python.org/moin/EnhancedPyPI for discussion. The patch is slightly revised from Tarek's last patch: I've simplified the PyPIRCCommand.finalize_options() method to not look at sys.argv. Tests still pass. ........ r63000 | alexandre.vassalotti | 2008-05-10 15:59:16 -0400 (Sat, 10 May 2008) | 5 lines Cleaned up io._BytesIO.write(). I am amazed that the old code, for inserting null-bytes, actually worked. Who wrote that thing? Oh, it is me... doh. ........ r63002 | brett.cannon | 2008-05-10 16:52:01 -0400 (Sat, 10 May 2008) | 2 lines Revert r62998 as it broke the build (seems distutils.config is missing). ........ r63014 | andrew.kuchling | 2008-05-10 18:12:38 -0400 (Sat, 10 May 2008) | 1 line #1858: add distutils.config module ........ r63027 | brett.cannon | 2008-05-10 21:09:32 -0400 (Sat, 10 May 2008) | 2 lines Flesh out the 3.0 deprecation to suggest using the ctypes module. ........ r63028 | skip.montanaro | 2008-05-10 22:59:30 -0400 (Sat, 10 May 2008) | 4 lines Copied two versions of the example from the interactive session. Delete one. ........ r63037 | georg.brandl | 2008-05-11 03:02:17 -0400 (Sun, 11 May 2008) | 2 lines reload() takes the module itself. ........ r63038 | alexandre.vassalotti | 2008-05-11 03:06:04 -0400 (Sun, 11 May 2008) | 4 lines Added test framework for handling module renames. Factored the import guard in test_py3kwarn.TestStdlibRemovals into a context manager, namely test_support.CleanImport. ........ r63039 | georg.brandl | 2008-05-11 03:06:05 -0400 (Sun, 11 May 2008) | 2 lines #2742: ``''`` is not converted to NULL in getaddrinfo. ........ r63040 | alexandre.vassalotti | 2008-05-11 03:08:12 -0400 (Sun, 11 May 2008) | 2 lines Fixed typo in a comment of test_support.CleanImport. ........ r63041 | alexandre.vassalotti | 2008-05-11 03:10:25 -0400 (Sun, 11 May 2008) | 2 lines Removed a dead line of code. ........ r63043 | georg.brandl | 2008-05-11 04:47:53 -0400 (Sun, 11 May 2008) | 2 lines #2812: document property.getter/setter/deleter. ........ r63049 | georg.brandl | 2008-05-11 05:06:30 -0400 (Sun, 11 May 2008) | 2 lines #1153769: document PEP 237 changes to string formatting. ........ r63050 | georg.brandl | 2008-05-11 05:11:40 -0400 (Sun, 11 May 2008) | 2 lines #2809: elaborate str.split docstring a bit. ........ r63051 | georg.brandl | 2008-05-11 06:13:59 -0400 (Sun, 11 May 2008) | 2 lines Fix typo. ........ r63052 | georg.brandl | 2008-05-11 06:33:27 -0400 (Sun, 11 May 2008) | 2 lines #2709: clarification. ........ r63053 | georg.brandl | 2008-05-11 06:42:28 -0400 (Sun, 11 May 2008) | 2 lines #2659: add ``break_on_hyphens`` to TextWrapper. ........ r63057 | georg.brandl | 2008-05-11 06:59:39 -0400 (Sun, 11 May 2008) | 2 lines #2741: clarification of value range for address_family. ........ r63058 | georg.brandl | 2008-05-11 07:09:35 -0400 (Sun, 11 May 2008) | 2 lines #2452: timeout is used for all blocking operations. ........ r63059 | andrew.kuchling | 2008-05-11 09:33:56 -0400 (Sun, 11 May 2008) | 2 lines #1792: Improve performance of marshal.dumps() on large objects by increasing the size of the buffer more quickly. ........ r63060 | andrew.kuchling | 2008-05-11 10:00:00 -0400 (Sun, 11 May 2008) | 1 line #1858: re-apply patch for this, adding the missing files ........ r63061 | benjamin.peterson | 2008-05-11 10:13:25 -0400 (Sun, 11 May 2008) | 2 lines Add the "until" command to pdb ........ r63062 | georg.brandl | 2008-05-11 10:17:13 -0400 (Sun, 11 May 2008) | 2 lines Add some sentence endings. ........
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operations (like connection attempts) will timeout after that many seconds
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(if it is not given, the global default timeout setting is used).
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The optional *source_address* parameter may be a tuple of a (host, port)
to use as the source address the HTTP connection is made from.
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For example, the following calls all create instances that connect to the server
at the same host and port::
>>> h1 = http.client.HTTPConnection('www.python.org')
>>> h2 = http.client.HTTPConnection('www.python.org:80')
>>> h3 = http.client.HTTPConnection('www.python.org', 80)
>>> h4 = http.client.HTTPConnection('www.python.org', 80, timeout=10)
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.. versionchanged:: 3.2
*source_address* was added.
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.. versionchanged:: 3.4
The *strict* parameter was removed. HTTP 0.9-style "Simple Responses" are
not longer supported.
.. class:: HTTPSConnection(host, port=None, key_file=None, \
cert_file=None[, timeout], \
source_address=None, *, context=None, \
check_hostname=None)
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A subclass of :class:`HTTPConnection` that uses SSL for communication with
secure servers. Default port is ``443``. If *context* is specified, it
must be a :class:`ssl.SSLContext` instance describing the various SSL
options.
*key_file* and *cert_file* are deprecated, please use
:meth:`ssl.SSLContext.load_cert_chain` instead, or let
:func:`ssl.create_default_context` select the system's trusted CA
certificates for you. The *check_hostname* parameter is also deprecated; the
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:attr:`ssl.SSLContext.check_hostname` attribute of *context* should be used
instead.
Please read :ref:`ssl-security` for more information on best practices.
.. versionchanged:: 3.2
*source_address*, *context* and *check_hostname* were added.
.. versionchanged:: 3.2
This class now supports HTTPS virtual hosts if possible (that is,
if :data:`ssl.HAS_SNI` is true).
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.. versionchanged:: 3.4
The *strict* parameter was removed. HTTP 0.9-style "Simple Responses" are
no longer supported.
.. versionchanged:: 3.4.3
This class now performs all the necessary certificate and hostname checks
by default. To revert to the previous, unverified, behavior
:func:`ssl._create_unverified_context` can be passed to the *context*
parameter.
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.. class:: HTTPResponse(sock, debuglevel=0, method=None, url=None)
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Class whose instances are returned upon successful connection. Not
instantiated directly by user.
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.. versionchanged:: 3.4
The *strict* parameter was removed. HTTP 0.9 style "Simple Responses" are
no longer supported.
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The following exceptions are raised as appropriate:
.. exception:: HTTPException
The base class of the other exceptions in this module. It is a subclass of
:exc:`Exception`.
.. exception:: NotConnected
A subclass of :exc:`HTTPException`.
.. exception:: InvalidURL
A subclass of :exc:`HTTPException`, raised if a port is given and is either
non-numeric or empty.
.. exception:: UnknownProtocol
A subclass of :exc:`HTTPException`.
.. exception:: UnknownTransferEncoding
A subclass of :exc:`HTTPException`.
.. exception:: UnimplementedFileMode
A subclass of :exc:`HTTPException`.
.. exception:: IncompleteRead
A subclass of :exc:`HTTPException`.
.. exception:: ImproperConnectionState
A subclass of :exc:`HTTPException`.
.. exception:: CannotSendRequest
A subclass of :exc:`ImproperConnectionState`.
.. exception:: CannotSendHeader
A subclass of :exc:`ImproperConnectionState`.
.. exception:: ResponseNotReady
A subclass of :exc:`ImproperConnectionState`.
.. exception:: BadStatusLine
A subclass of :exc:`HTTPException`. Raised if a server responds with a HTTP
status code that we don't understand.
.. exception:: LineTooLong
A subclass of :exc:`HTTPException`. Raised if an excessively long line
is received in the HTTP protocol from the server.
.. exception:: RemoteDisconnected
A subclass of :exc:`ConnectionResetError` and :exc:`BadStatusLine`. Raised
by :meth:`HTTPConnection.getresponse` when the attempt to read the response
results in no data read from the connection, indicating that the remote end
has closed the connection.
.. versionadded:: 3.5
Previously, :exc:`BadStatusLine`\ ``('')`` was raised.
The constants defined in this module are:
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.. data:: HTTP_PORT
The default port for the HTTP protocol (always ``80``).
.. data:: HTTPS_PORT
The default port for the HTTPS protocol (always ``443``).
.. data:: responses
This dictionary maps the HTTP 1.1 status codes to the W3C names.
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Example: ``http.client.responses[http.client.NOT_FOUND]`` is ``'Not Found'``.
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See :ref:`http-status-codes` for a list of HTTP status codes that are
available in this module as constants.
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.. _httpconnection-objects:
HTTPConnection Objects
----------------------
:class:`HTTPConnection` instances have the following methods:
.. method:: HTTPConnection.request(method, url, body=None, headers={})
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This will send a request to the server using the HTTP request
method *method* and the selector *url*.
If *body* is specified, the specified data is sent after the headers are
finished. It may be a string, a :term:`bytes-like object`, an open
:term:`file object`, or an iterable of :term:`bytes-like object`\s. If
*body* is a string, it is encoded as ISO-8851-1, the default for HTTP. If
it is a bytes-like object the bytes are sent as is. If it is a :term:`file
object`, the contents of the file is sent; this file object should support
at least the ``read()`` method. If the file object has a ``mode``
attribute, the data returned by the ``read()`` method will be encoded as
ISO-8851-1 unless the ``mode`` attribute contains the substring ``b``,
otherwise the data returned by ``read()`` is sent as is. If *body* is an
iterable, the elements of the iterable are sent as is until the iterable is
exhausted.
The *headers* argument should be a mapping of extra HTTP
headers to send with the request.
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If *headers* does not contain a Content-Length item, one is added
automatically if possible. If *body* is ``None``, the Content-Length header
is set to ``0`` for methods that expect a body (``PUT``, ``POST``, and
``PATCH``). If *body* is a string or bytes object, the Content-Length
header is set to its length. If *body* is a :term:`file object` and it
works to call :func:`~os.fstat` on the result of its ``fileno()`` method,
then the Content-Length header is set to the ``st_size`` reported by the
``fstat`` call. Otherwise no Content-Length header is added.
.. versionadded:: 3.2
*body* can now be an iterable.
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.. method:: HTTPConnection.getresponse()
Should be called after a request is sent to get the response from the server.
Returns an :class:`HTTPResponse` instance.
.. note::
Note that you must have read the whole response before you can send a new
request to the server.
.. versionchanged:: 3.5
If a :exc:`ConnectionError` or subclass is raised, the
:class:`HTTPConnection` object will be ready to reconnect when
a new request is sent.
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.. method:: HTTPConnection.set_debuglevel(level)
Set the debugging level. The default debug level is ``0``, meaning no
debugging output is printed. Any value greater than ``0`` will cause all
currently defined debug output to be printed to stdout. The ``debuglevel``
is passed to any new :class:`HTTPResponse` objects that are created.
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.. versionadded:: 3.1
Merged revisions 72506,72525-72526,72551,72558,72616,72654-72655,72689,72745,72750,72802,72812,72822,72824,72826-72827,72833,72876,72890,72923,72946,73026,73042,73045,73047,73065,73068-73069 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r72506 | vinay.sajip | 2009-05-09 07:07:17 -0500 (Sat, 09 May 2009) | 1 line Issue #5971: StreamHandler.handleError now swallows IOErrors which occur when trying to print a traceback. ........ r72525 | benjamin.peterson | 2009-05-09 20:38:02 -0500 (Sat, 09 May 2009) | 1 line close file explicitly ........ r72526 | benjamin.peterson | 2009-05-09 21:29:00 -0500 (Sat, 09 May 2009) | 1 line make sure files are closed using the with statement ........ r72551 | benjamin.peterson | 2009-05-10 09:16:47 -0500 (Sun, 10 May 2009) | 1 line use isinstance ........ r72558 | benjamin.peterson | 2009-05-10 18:52:09 -0500 (Sun, 10 May 2009) | 1 line sys.setdefaultencoding() strikes me as a bad example ........ r72616 | benjamin.peterson | 2009-05-13 19:33:10 -0500 (Wed, 13 May 2009) | 1 line importlib.import_module is better these days ........ r72654 | benjamin.peterson | 2009-05-14 17:37:49 -0500 (Thu, 14 May 2009) | 1 line prevent refleaks from threads ........ r72655 | benjamin.peterson | 2009-05-14 17:40:34 -0500 (Thu, 14 May 2009) | 1 line a useful decorator for cleaning up threads ........ r72689 | benjamin.peterson | 2009-05-16 13:44:34 -0500 (Sat, 16 May 2009) | 1 line use skipTest() ........ r72745 | benjamin.peterson | 2009-05-17 09:16:29 -0500 (Sun, 17 May 2009) | 1 line ignore .rst files in sphinx its self ........ r72750 | benjamin.peterson | 2009-05-17 11:59:27 -0500 (Sun, 17 May 2009) | 1 line chop off slash ........ r72802 | georg.brandl | 2009-05-20 13:35:27 -0500 (Wed, 20 May 2009) | 1 line #6051: refer to email examples for better way to construct email messages. ........ r72812 | michael.foord | 2009-05-21 17:57:02 -0500 (Thu, 21 May 2009) | 1 line Rename TestCase._result to _resultForDoCleanups to avoid potential clashes in TestCase subclasses. Issue 6072. ........ r72822 | georg.brandl | 2009-05-22 04:33:25 -0500 (Fri, 22 May 2009) | 1 line #6084: fix example. ........ r72824 | georg.brandl | 2009-05-22 04:43:17 -0500 (Fri, 22 May 2009) | 1 line Fix references to file-related functions and methods (os.* vs file.*). ........ r72826 | georg.brandl | 2009-05-22 04:49:42 -0500 (Fri, 22 May 2009) | 1 line Fix confusing wording. ........ r72827 | georg.brandl | 2009-05-22 04:50:30 -0500 (Fri, 22 May 2009) | 1 line s/use/call/ ........ r72833 | georg.brandl | 2009-05-22 12:00:17 -0500 (Fri, 22 May 2009) | 1 line #6078: _warnings is a builtin module and has no standard init_warnings function. ........ r72876 | benjamin.peterson | 2009-05-23 15:59:09 -0500 (Sat, 23 May 2009) | 1 line remove mention of old ctypes version ........ r72890 | gregory.p.smith | 2009-05-24 13:00:13 -0500 (Sun, 24 May 2009) | 2 lines add a versionadded tag for set_tunnel ........ r72923 | michael.foord | 2009-05-25 15:36:56 -0500 (Mon, 25 May 2009) | 1 line Make assertSequenceEqual error messages less cryptic, particularly for nested sequences. ........ r72946 | ronald.oussoren | 2009-05-26 13:44:48 -0500 (Tue, 26 May 2009) | 2 lines Fixes issue 6110 ........ r73026 | r.david.murray | 2009-05-29 14:30:27 -0500 (Fri, 29 May 2009) | 3 lines Issue 6141: document that the first item of args is still the command name even when executable is specified. ........ r73042 | benjamin.peterson | 2009-05-29 22:10:52 -0500 (Fri, 29 May 2009) | 1 line no fdatasync on macos ........ r73045 | georg.brandl | 2009-05-30 02:26:04 -0500 (Sat, 30 May 2009) | 1 line #6146: fix markup bug. ........ r73047 | georg.brandl | 2009-05-30 05:33:23 -0500 (Sat, 30 May 2009) | 1 line Fix some more small markup problems. ........ r73065 | antoine.pitrou | 2009-05-30 16:39:25 -0500 (Sat, 30 May 2009) | 3 lines The test for #5330 wasn't correct. ........ r73068 | antoine.pitrou | 2009-05-30 16:45:40 -0500 (Sat, 30 May 2009) | 3 lines Update ACKS ........ r73069 | benjamin.peterson | 2009-05-30 19:42:42 -0500 (Sat, 30 May 2009) | 1 line fix signature ........
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.. method:: HTTPConnection.set_tunnel(host, port=None, headers=None)
Set the host and the port for HTTP Connect Tunnelling. This allows running
the connection through a proxy server.
The host and port arguments specify the endpoint of the tunneled connection
(i.e. the address included in the CONNECT request, *not* the address of the
proxy server).
The headers argument should be a mapping of extra HTTP headers to send with
the CONNECT request.
For example, to tunnel through a HTTPS proxy server running locally on port
8080, we would pass the address of the proxy to the :class:`HTTPSConnection`
constructor, and the address of the host that we eventually want to reach to
the :meth:`~HTTPConnection.set_tunnel` method::
>>> import http.client
>>> conn = http.client.HTTPSConnection("localhost", 8080)
>>> conn.set_tunnel("www.python.org")
>>> conn.request("HEAD","/index.html")
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.. versionadded:: 3.2
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.. method:: HTTPConnection.connect()
Connect to the server specified when the object was created. By default,
this is called automatically when making a request if the client does not
already have a connection.
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.. method:: HTTPConnection.close()
Close the connection to the server.
As an alternative to using the :meth:`request` method described above, you can
also send your request step by step, by using the four functions below.
.. method:: HTTPConnection.putrequest(request, selector, skip_host=False, skip_accept_encoding=False)
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This should be the first call after the connection to the server has been made.
It sends a line to the server consisting of the *request* string, the *selector*
string, and the HTTP version (``HTTP/1.1``). To disable automatic sending of
``Host:`` or ``Accept-Encoding:`` headers (for example to accept additional
content encodings), specify *skip_host* or *skip_accept_encoding* with non-False
values.
.. method:: HTTPConnection.putheader(header, argument[, ...])
Send an :rfc:`822`\ -style header to the server. It sends a line to the server
consisting of the header, a colon and a space, and the first argument. If more
arguments are given, continuation lines are sent, each consisting of a tab and
an argument.
.. method:: HTTPConnection.endheaders(message_body=None)
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Send a blank line to the server, signalling the end of the headers. The
optional *message_body* argument can be used to pass a message body
associated with the request. The message body will be sent in the same
packet as the message headers if it is string, otherwise it is sent in a
separate packet.
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.. method:: HTTPConnection.send(data)
Send data to the server. This should be used directly only after the
:meth:`endheaders` method has been called and before :meth:`getresponse` is
called.
.. _httpresponse-objects:
HTTPResponse Objects
--------------------
An :class:`HTTPResponse` instance wraps the HTTP response from the
server. It provides access to the request headers and the entity
body. The response is an iterable object and can be used in a with
statement.
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.. method:: HTTPResponse.read([amt])
Reads and returns the response body, or up to the next *amt* bytes.
.. method:: HTTPResponse.readinto(b)
Reads up to the next len(b) bytes of the response body into the buffer *b*.
Returns the number of bytes read.
.. versionadded:: 3.3
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.. method:: HTTPResponse.getheader(name, default=None)
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Return the value of the header *name*, or *default* if there is no header
matching *name*. If there is more than one header with the name *name*,
return all of the values joined by ', '. If 'default' is any iterable other
than a single string, its elements are similarly returned joined by commas.
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.. method:: HTTPResponse.getheaders()
Return a list of (header, value) tuples.
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.. method:: HTTPResponse.fileno()
Return the ``fileno`` of the underlying socket.
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.. attribute:: HTTPResponse.msg
A :class:`http.client.HTTPMessage` instance containing the response
headers. :class:`http.client.HTTPMessage` is a subclass of
:class:`email.message.Message`.
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.. attribute:: HTTPResponse.version
HTTP protocol version used by server. 10 for HTTP/1.0, 11 for HTTP/1.1.
.. attribute:: HTTPResponse.status
Status code returned by server.
.. attribute:: HTTPResponse.reason
Reason phrase returned by server.
.. attribute:: HTTPResponse.debuglevel
A debugging hook. If :attr:`debuglevel` is greater than zero, messages
will be printed to stdout as the response is read and parsed.
.. attribute:: HTTPResponse.closed
Is ``True`` if the stream is closed.
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Examples
--------
Here is an example session that uses the ``GET`` method::
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>>> import http.client
>>> conn = http.client.HTTPSConnection("www.python.org")
>>> conn.request("GET", "/")
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>>> r1 = conn.getresponse()
>>> print(r1.status, r1.reason)
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200 OK
>>> data1 = r1.read() # This will return entire content.
>>> # The following example demonstrates reading data in chunks.
>>> conn.request("GET", "/")
>>> r1 = conn.getresponse()
>>> while not r1.closed:
... print(r1.read(200)) # 200 bytes
b'<!doctype html>\n<!--[if"...
...
>>> # Example of an invalid request
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>>> conn.request("GET", "/parrot.spam")
>>> r2 = conn.getresponse()
>>> print(r2.status, r2.reason)
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404 Not Found
>>> data2 = r2.read()
>>> conn.close()
Here is an example session that uses the ``HEAD`` method. Note that the
``HEAD`` method never returns any data. ::
>>> import http.client
>>> conn = http.client.HTTPSConnection("www.python.org")
>>> conn.request("HEAD", "/")
>>> res = conn.getresponse()
>>> print(res.status, res.reason)
200 OK
>>> data = res.read()
>>> print(len(data))
0
>>> data == b''
True
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Here is an example session that shows how to ``POST`` requests::
>>> import http.client, urllib.parse
>>> params = urllib.parse.urlencode({'@number': 12524, '@type': 'issue', '@action': 'show'})
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>>> headers = {"Content-type": "application/x-www-form-urlencoded",
... "Accept": "text/plain"}
>>> conn = http.client.HTTPConnection("bugs.python.org")
>>> conn.request("POST", "", params, headers)
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>>> response = conn.getresponse()
>>> print(response.status, response.reason)
302 Found
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>>> data = response.read()
>>> data
b'Redirecting to <a href="http://bugs.python.org/issue12524">http://bugs.python.org/issue12524</a>'
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>>> conn.close()
Client side ``HTTP PUT`` requests are very similar to ``POST`` requests. The
difference lies only the server side where HTTP server will allow resources to
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be created via ``PUT`` request. It should be noted that custom HTTP methods
+are also handled in :class:`urllib.request.Request` by sending the appropriate
+method attribute.Here is an example session that shows how to do ``PUT``
request using http.client::
>>> # This creates an HTTP message
>>> # with the content of BODY as the enclosed representation
>>> # for the resource http://localhost:8080/file
...
>>> import http.client
>>> BODY = "***filecontents***"
>>> conn = http.client.HTTPConnection("localhost", 8080)
>>> conn.request("PUT", "/file", BODY)
>>> response = conn.getresponse()
>>> print(response.status, response.reason)
200, OK
.. _httpmessage-objects:
HTTPMessage Objects
-------------------
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An :class:`http.client.HTTPMessage` instance holds the headers from an HTTP
response. It is implemented using the :class:`email.message.Message` class.
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.. XXX Define the methods that clients can depend upon between versions.