710 lines
26 KiB
Python
710 lines
26 KiB
Python
# urllib3/connectionpool.py
|
|
# Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
|
|
#
|
|
# This module is part of urllib3 and is released under
|
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
|
|
|
import sys
|
|
import errno
|
|
import logging
|
|
|
|
from socket import error as SocketError, timeout as SocketTimeout
|
|
import socket
|
|
|
|
try: # Python 3
|
|
from queue import LifoQueue, Empty, Full
|
|
except ImportError:
|
|
from Queue import LifoQueue, Empty, Full
|
|
import Queue as _ # Platform-specific: Windows
|
|
|
|
|
|
from .exceptions import (
|
|
ClosedPoolError,
|
|
ConnectionError,
|
|
ConnectTimeoutError,
|
|
EmptyPoolError,
|
|
HostChangedError,
|
|
LocationParseError,
|
|
MaxRetryError,
|
|
SSLError,
|
|
TimeoutError,
|
|
ReadTimeoutError,
|
|
ProxyError,
|
|
)
|
|
from .packages.ssl_match_hostname import CertificateError
|
|
from .packages import six
|
|
from .connection import (
|
|
port_by_scheme,
|
|
DummyConnection,
|
|
HTTPConnection, HTTPSConnection, VerifiedHTTPSConnection,
|
|
HTTPException, BaseSSLError,
|
|
)
|
|
from .request import RequestMethods
|
|
from .response import HTTPResponse
|
|
from .util import (
|
|
get_host,
|
|
is_connection_dropped,
|
|
Timeout,
|
|
)
|
|
|
|
|
|
xrange = six.moves.xrange
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
_Default = object()
|
|
|
|
## Pool objects
|
|
|
|
class ConnectionPool(object):
|
|
"""
|
|
Base class for all connection pools, such as
|
|
:class:`.HTTPConnectionPool` and :class:`.HTTPSConnectionPool`.
|
|
"""
|
|
|
|
scheme = None
|
|
QueueCls = LifoQueue
|
|
|
|
def __init__(self, host, port=None):
|
|
if host is None:
|
|
raise LocationParseError(host)
|
|
|
|
# httplib doesn't like it when we include brackets in ipv6 addresses
|
|
host = host.strip('[]')
|
|
|
|
self.host = host
|
|
self.port = port
|
|
|
|
def __str__(self):
|
|
return '%s(host=%r, port=%r)' % (type(self).__name__,
|
|
self.host, self.port)
|
|
|
|
# This is taken from http://hg.python.org/cpython/file/7aaba721ebc0/Lib/socket.py#l252
|
|
_blocking_errnos = set([errno.EAGAIN, errno.EWOULDBLOCK])
|
|
|
|
class HTTPConnectionPool(ConnectionPool, RequestMethods):
|
|
"""
|
|
Thread-safe connection pool for one host.
|
|
|
|
:param host:
|
|
Host used for this HTTP Connection (e.g. "localhost"), passed into
|
|
:class:`httplib.HTTPConnection`.
|
|
|
|
:param port:
|
|
Port used for this HTTP Connection (None is equivalent to 80), passed
|
|
into :class:`httplib.HTTPConnection`.
|
|
|
|
:param strict:
|
|
Causes BadStatusLine to be raised if the status line can't be parsed
|
|
as a valid HTTP/1.0 or 1.1 status line, passed into
|
|
:class:`httplib.HTTPConnection`.
|
|
|
|
.. note::
|
|
Only works in Python 2. This parameter is ignored in Python 3.
|
|
|
|
:param timeout:
|
|
Socket timeout in seconds for each individual connection. This can
|
|
be a float or integer, which sets the timeout for the HTTP request,
|
|
or an instance of :class:`urllib3.util.Timeout` which gives you more
|
|
fine-grained control over request timeouts. After the constructor has
|
|
been parsed, this is always a `urllib3.util.Timeout` object.
|
|
|
|
:param maxsize:
|
|
Number of connections to save that can be reused. More than 1 is useful
|
|
in multithreaded situations. If ``block`` is set to false, more
|
|
connections will be created but they will not be saved once they've
|
|
been used.
|
|
|
|
:param block:
|
|
If set to True, no more than ``maxsize`` connections will be used at
|
|
a time. When no free connections are available, the call will block
|
|
until a connection has been released. This is a useful side effect for
|
|
particular multithreaded situations where one does not want to use more
|
|
than maxsize connections per host to prevent flooding.
|
|
|
|
:param headers:
|
|
Headers to include with all requests, unless other headers are given
|
|
explicitly.
|
|
|
|
:param _proxy:
|
|
Parsed proxy URL, should not be used directly, instead, see
|
|
:class:`urllib3.connectionpool.ProxyManager`"
|
|
|
|
:param _proxy_headers:
|
|
A dictionary with proxy headers, should not be used directly,
|
|
instead, see :class:`urllib3.connectionpool.ProxyManager`"
|
|
"""
|
|
|
|
scheme = 'http'
|
|
ConnectionCls = HTTPConnection
|
|
|
|
def __init__(self, host, port=None, strict=False,
|
|
timeout=Timeout.DEFAULT_TIMEOUT, maxsize=1, block=False,
|
|
headers=None, _proxy=None, _proxy_headers=None, **conn_kw):
|
|
ConnectionPool.__init__(self, host, port)
|
|
RequestMethods.__init__(self, headers)
|
|
|
|
self.strict = strict
|
|
|
|
# This is for backwards compatibility and can be removed once a timeout
|
|
# can only be set to a Timeout object
|
|
if not isinstance(timeout, Timeout):
|
|
timeout = Timeout.from_float(timeout)
|
|
|
|
self.timeout = timeout
|
|
|
|
self.pool = self.QueueCls(maxsize)
|
|
self.block = block
|
|
|
|
self.proxy = _proxy
|
|
self.proxy_headers = _proxy_headers or {}
|
|
|
|
# Fill the queue up so that doing get() on it will block properly
|
|
for _ in xrange(maxsize):
|
|
self.pool.put(None)
|
|
|
|
# These are mostly for testing and debugging purposes.
|
|
self.num_connections = 0
|
|
self.num_requests = 0
|
|
|
|
if sys.version_info < (2, 7): # Python 2.6 and older
|
|
conn_kw.pop('source_address', None)
|
|
self.conn_kw = conn_kw
|
|
|
|
def _new_conn(self):
|
|
"""
|
|
Return a fresh :class:`HTTPConnection`.
|
|
"""
|
|
self.num_connections += 1
|
|
log.info("Starting new HTTP connection (%d): %s" %
|
|
(self.num_connections, self.host))
|
|
|
|
conn = self.ConnectionCls(host=self.host, port=self.port,
|
|
timeout=self.timeout.connect_timeout,
|
|
strict=self.strict, **self.conn_kw)
|
|
if self.proxy is not None:
|
|
# Enable Nagle's algorithm for proxies, to avoid packet
|
|
# fragmentation.
|
|
conn.tcp_nodelay = 0
|
|
return conn
|
|
|
|
def _get_conn(self, timeout=None):
|
|
"""
|
|
Get a connection. Will return a pooled connection if one is available.
|
|
|
|
If no connections are available and :prop:`.block` is ``False``, then a
|
|
fresh connection is returned.
|
|
|
|
:param timeout:
|
|
Seconds to wait before giving up and raising
|
|
:class:`urllib3.exceptions.EmptyPoolError` if the pool is empty and
|
|
:prop:`.block` is ``True``.
|
|
"""
|
|
conn = None
|
|
try:
|
|
conn = self.pool.get(block=self.block, timeout=timeout)
|
|
|
|
except AttributeError: # self.pool is None
|
|
raise ClosedPoolError(self, "Pool is closed.")
|
|
|
|
except Empty:
|
|
if self.block:
|
|
raise EmptyPoolError(self,
|
|
"Pool reached maximum size and no more "
|
|
"connections are allowed.")
|
|
pass # Oh well, we'll create a new connection then
|
|
|
|
# If this is a persistent connection, check if it got disconnected
|
|
if conn and is_connection_dropped(conn):
|
|
log.info("Resetting dropped connection: %s" % self.host)
|
|
conn.close()
|
|
|
|
return conn or self._new_conn()
|
|
|
|
def _put_conn(self, conn):
|
|
"""
|
|
Put a connection back into the pool.
|
|
|
|
:param conn:
|
|
Connection object for the current host and port as returned by
|
|
:meth:`._new_conn` or :meth:`._get_conn`.
|
|
|
|
If the pool is already full, the connection is closed and discarded
|
|
because we exceeded maxsize. If connections are discarded frequently,
|
|
then maxsize should be increased.
|
|
|
|
If the pool is closed, then the connection will be closed and discarded.
|
|
"""
|
|
try:
|
|
self.pool.put(conn, block=False)
|
|
return # Everything is dandy, done.
|
|
except AttributeError:
|
|
# self.pool is None.
|
|
pass
|
|
except Full:
|
|
# This should never happen if self.block == True
|
|
log.warning(
|
|
"Connection pool is full, discarding connection: %s" %
|
|
self.host)
|
|
|
|
# Connection never got put back into the pool, close it.
|
|
if conn:
|
|
conn.close()
|
|
|
|
def _get_timeout(self, timeout):
|
|
""" Helper that always returns a :class:`urllib3.util.Timeout` """
|
|
if timeout is _Default:
|
|
return self.timeout.clone()
|
|
|
|
if isinstance(timeout, Timeout):
|
|
return timeout.clone()
|
|
else:
|
|
# User passed us an int/float. This is for backwards compatibility,
|
|
# can be removed later
|
|
return Timeout.from_float(timeout)
|
|
|
|
def _make_request(self, conn, method, url, timeout=_Default,
|
|
**httplib_request_kw):
|
|
"""
|
|
Perform a request on a given urllib connection object taken from our
|
|
pool.
|
|
|
|
:param conn:
|
|
a connection from one of our connection pools
|
|
|
|
:param timeout:
|
|
Socket timeout in seconds for the request. This can be a
|
|
float or integer, which will set the same timeout value for
|
|
the socket connect and the socket read, or an instance of
|
|
:class:`urllib3.util.Timeout`, which gives you more fine-grained
|
|
control over your timeouts.
|
|
"""
|
|
self.num_requests += 1
|
|
|
|
timeout_obj = self._get_timeout(timeout)
|
|
|
|
try:
|
|
timeout_obj.start_connect()
|
|
conn.timeout = timeout_obj.connect_timeout
|
|
# conn.request() calls httplib.*.request, not the method in
|
|
# urllib3.request. It also calls makefile (recv) on the socket.
|
|
conn.request(method, url, **httplib_request_kw)
|
|
except SocketTimeout:
|
|
raise ConnectTimeoutError(
|
|
self, "Connection to %s timed out. (connect timeout=%s)" %
|
|
(self.host, timeout_obj.connect_timeout))
|
|
|
|
# Reset the timeout for the recv() on the socket
|
|
read_timeout = timeout_obj.read_timeout
|
|
|
|
# App Engine doesn't have a sock attr
|
|
if hasattr(conn, 'sock'):
|
|
# In Python 3 socket.py will catch EAGAIN and return None when you
|
|
# try and read into the file pointer created by http.client, which
|
|
# instead raises a BadStatusLine exception. Instead of catching
|
|
# the exception and assuming all BadStatusLine exceptions are read
|
|
# timeouts, check for a zero timeout before making the request.
|
|
if read_timeout == 0:
|
|
raise ReadTimeoutError(
|
|
self, url,
|
|
"Read timed out. (read timeout=%s)" % read_timeout)
|
|
if read_timeout is Timeout.DEFAULT_TIMEOUT:
|
|
conn.sock.settimeout(socket.getdefaulttimeout())
|
|
else: # None or a value
|
|
conn.sock.settimeout(read_timeout)
|
|
|
|
# Receive the response from the server
|
|
try:
|
|
try: # Python 2.7+, use buffering of HTTP responses
|
|
httplib_response = conn.getresponse(buffering=True)
|
|
except TypeError: # Python 2.6 and older
|
|
httplib_response = conn.getresponse()
|
|
except SocketTimeout:
|
|
raise ReadTimeoutError(
|
|
self, url, "Read timed out. (read timeout=%s)" % read_timeout)
|
|
|
|
except BaseSSLError as e:
|
|
# Catch possible read timeouts thrown as SSL errors. If not the
|
|
# case, rethrow the original. We need to do this because of:
|
|
# http://bugs.python.org/issue10272
|
|
if 'timed out' in str(e) or \
|
|
'did not complete (read)' in str(e): # Python 2.6
|
|
raise ReadTimeoutError(self, url, "Read timed out.")
|
|
|
|
raise
|
|
|
|
except SocketError as e: # Platform-specific: Python 2
|
|
# See the above comment about EAGAIN in Python 3. In Python 2 we
|
|
# have to specifically catch it and throw the timeout error
|
|
if e.errno in _blocking_errnos:
|
|
raise ReadTimeoutError(
|
|
self, url,
|
|
"Read timed out. (read timeout=%s)" % read_timeout)
|
|
|
|
raise
|
|
|
|
# AppEngine doesn't have a version attr.
|
|
http_version = getattr(conn, '_http_vsn_str', 'HTTP/?')
|
|
log.debug("\"%s %s %s\" %s %s" % (method, url, http_version,
|
|
httplib_response.status,
|
|
httplib_response.length))
|
|
return httplib_response
|
|
|
|
def close(self):
|
|
"""
|
|
Close all pooled connections and disable the pool.
|
|
"""
|
|
# Disable access to the pool
|
|
old_pool, self.pool = self.pool, None
|
|
|
|
try:
|
|
while True:
|
|
conn = old_pool.get(block=False)
|
|
if conn:
|
|
conn.close()
|
|
|
|
except Empty:
|
|
pass # Done.
|
|
|
|
def is_same_host(self, url):
|
|
"""
|
|
Check if the given ``url`` is a member of the same host as this
|
|
connection pool.
|
|
"""
|
|
if url.startswith('/'):
|
|
return True
|
|
|
|
# TODO: Add optional support for socket.gethostbyname checking.
|
|
scheme, host, port = get_host(url)
|
|
|
|
# Use explicit default port for comparison when none is given
|
|
if self.port and not port:
|
|
port = port_by_scheme.get(scheme)
|
|
elif not self.port and port == port_by_scheme.get(scheme):
|
|
port = None
|
|
|
|
return (scheme, host, port) == (self.scheme, self.host, self.port)
|
|
|
|
def urlopen(self, method, url, body=None, headers=None, retries=3,
|
|
redirect=True, assert_same_host=True, timeout=_Default,
|
|
pool_timeout=None, release_conn=None, **response_kw):
|
|
"""
|
|
Get a connection from the pool and perform an HTTP request. This is the
|
|
lowest level call for making a request, so you'll need to specify all
|
|
the raw details.
|
|
|
|
.. note::
|
|
|
|
More commonly, it's appropriate to use a convenience method provided
|
|
by :class:`.RequestMethods`, such as :meth:`request`.
|
|
|
|
.. note::
|
|
|
|
`release_conn` will only behave as expected if
|
|
`preload_content=False` because we want to make
|
|
`preload_content=False` the default behaviour someday soon without
|
|
breaking backwards compatibility.
|
|
|
|
:param method:
|
|
HTTP request method (such as GET, POST, PUT, etc.)
|
|
|
|
:param body:
|
|
Data to send in the request body (useful for creating
|
|
POST requests, see HTTPConnectionPool.post_url for
|
|
more convenience).
|
|
|
|
:param headers:
|
|
Dictionary of custom headers to send, such as User-Agent,
|
|
If-None-Match, etc. If None, pool headers are used. If provided,
|
|
these headers completely replace any pool-specific headers.
|
|
|
|
:param retries:
|
|
Number of retries to allow before raising a MaxRetryError exception.
|
|
If `False`, then retries are disabled and any exception is raised
|
|
immediately.
|
|
|
|
:param redirect:
|
|
If True, automatically handle redirects (status codes 301, 302,
|
|
303, 307, 308). Each redirect counts as a retry. Disabling retries
|
|
will disable redirect, too.
|
|
|
|
:param assert_same_host:
|
|
If ``True``, will make sure that the host of the pool requests is
|
|
consistent else will raise HostChangedError. When False, you can
|
|
use the pool on an HTTP proxy and request foreign hosts.
|
|
|
|
:param timeout:
|
|
If specified, overrides the default timeout for this one
|
|
request. It may be a float (in seconds) or an instance of
|
|
:class:`urllib3.util.Timeout`.
|
|
|
|
:param pool_timeout:
|
|
If set and the pool is set to block=True, then this method will
|
|
block for ``pool_timeout`` seconds and raise EmptyPoolError if no
|
|
connection is available within the time period.
|
|
|
|
:param release_conn:
|
|
If False, then the urlopen call will not release the connection
|
|
back into the pool once a response is received (but will release if
|
|
you read the entire contents of the response such as when
|
|
`preload_content=True`). This is useful if you're not preloading
|
|
the response's content immediately. You will need to call
|
|
``r.release_conn()`` on the response ``r`` to return the connection
|
|
back into the pool. If None, it takes the value of
|
|
``response_kw.get('preload_content', True)``.
|
|
|
|
:param \**response_kw:
|
|
Additional parameters are passed to
|
|
:meth:`urllib3.response.HTTPResponse.from_httplib`
|
|
"""
|
|
if headers is None:
|
|
headers = self.headers
|
|
|
|
if retries < 0 and retries is not False:
|
|
raise MaxRetryError(self, url)
|
|
|
|
if release_conn is None:
|
|
release_conn = response_kw.get('preload_content', True)
|
|
|
|
# Check host
|
|
if assert_same_host and not self.is_same_host(url):
|
|
raise HostChangedError(self, url, retries - 1)
|
|
|
|
conn = None
|
|
|
|
# Merge the proxy headers. Only do this in HTTP. We have to copy the
|
|
# headers dict so we can safely change it without those changes being
|
|
# reflected in anyone else's copy.
|
|
if self.scheme == 'http':
|
|
headers = headers.copy()
|
|
headers.update(self.proxy_headers)
|
|
|
|
# Must keep the exception bound to a separate variable or else Python 3
|
|
# complains about UnboundLocalError.
|
|
err = None
|
|
|
|
try:
|
|
# Request a connection from the queue
|
|
conn = self._get_conn(timeout=pool_timeout)
|
|
|
|
# Make the request on the httplib connection object
|
|
httplib_response = self._make_request(conn, method, url,
|
|
timeout=timeout,
|
|
body=body, headers=headers)
|
|
|
|
# If we're going to release the connection in ``finally:``, then
|
|
# the request doesn't need to know about the connection. Otherwise
|
|
# it will also try to release it and we'll have a double-release
|
|
# mess.
|
|
response_conn = not release_conn and conn
|
|
|
|
# Import httplib's response into our own wrapper object
|
|
response = HTTPResponse.from_httplib(httplib_response,
|
|
pool=self,
|
|
connection=response_conn,
|
|
**response_kw)
|
|
|
|
# else:
|
|
# The connection will be put back into the pool when
|
|
# ``response.release_conn()`` is called (implicitly by
|
|
# ``response.read()``)
|
|
|
|
except Empty:
|
|
# Timed out by queue.
|
|
raise EmptyPoolError(self, "No pool connections are available.")
|
|
|
|
except (BaseSSLError, CertificateError) as e:
|
|
# Release connection unconditionally because there is no way to
|
|
# close it externally in case of exception.
|
|
release_conn = True
|
|
raise SSLError(e)
|
|
|
|
except (TimeoutError, HTTPException, SocketError) as e:
|
|
if conn:
|
|
# Discard the connection for these exceptions. It will be
|
|
# be replaced during the next _get_conn() call.
|
|
conn.close()
|
|
conn = None
|
|
|
|
if not retries:
|
|
if isinstance(e, TimeoutError):
|
|
# TimeoutError is exempt from MaxRetryError-wrapping.
|
|
# FIXME: ... Not sure why. Add a reason here.
|
|
raise
|
|
|
|
# Wrap unexpected exceptions with the most appropriate
|
|
# module-level exception and re-raise.
|
|
if isinstance(e, SocketError) and self.proxy:
|
|
raise ProxyError('Cannot connect to proxy.', e)
|
|
|
|
if retries is False:
|
|
raise ConnectionError('Connection failed.', e)
|
|
|
|
raise MaxRetryError(self, url, e)
|
|
|
|
# Keep track of the error for the retry warning.
|
|
err = e
|
|
|
|
finally:
|
|
if release_conn:
|
|
# Put the connection back to be reused. If the connection is
|
|
# expired then it will be None, which will get replaced with a
|
|
# fresh connection during _get_conn.
|
|
self._put_conn(conn)
|
|
|
|
if not conn:
|
|
# Try again
|
|
log.warning("Retrying (%d attempts remain) after connection "
|
|
"broken by '%r': %s" % (retries, err, url))
|
|
return self.urlopen(method, url, body, headers, retries - 1,
|
|
redirect, assert_same_host,
|
|
timeout=timeout, pool_timeout=pool_timeout,
|
|
release_conn=release_conn, **response_kw)
|
|
|
|
# Handle redirect?
|
|
redirect_location = redirect and response.get_redirect_location()
|
|
if redirect_location and retries is not False:
|
|
if response.status == 303:
|
|
method = 'GET'
|
|
log.info("Redirecting %s -> %s" % (url, redirect_location))
|
|
return self.urlopen(method, redirect_location, body, headers,
|
|
retries - 1, redirect, assert_same_host,
|
|
timeout=timeout, pool_timeout=pool_timeout,
|
|
release_conn=release_conn, **response_kw)
|
|
|
|
return response
|
|
|
|
|
|
class HTTPSConnectionPool(HTTPConnectionPool):
|
|
"""
|
|
Same as :class:`.HTTPConnectionPool`, but HTTPS.
|
|
|
|
When Python is compiled with the :mod:`ssl` module, then
|
|
:class:`.VerifiedHTTPSConnection` is used, which *can* verify certificates,
|
|
instead of :class:`.HTTPSConnection`.
|
|
|
|
:class:`.VerifiedHTTPSConnection` uses one of ``assert_fingerprint``,
|
|
``assert_hostname`` and ``host`` in this order to verify connections.
|
|
If ``assert_hostname`` is False, no verification is done.
|
|
|
|
The ``key_file``, ``cert_file``, ``cert_reqs``, ``ca_certs`` and
|
|
``ssl_version`` are only used if :mod:`ssl` is available and are fed into
|
|
:meth:`urllib3.util.ssl_wrap_socket` to upgrade the connection socket
|
|
into an SSL socket.
|
|
"""
|
|
|
|
scheme = 'https'
|
|
ConnectionCls = HTTPSConnection
|
|
|
|
def __init__(self, host, port=None,
|
|
strict=False, timeout=None, maxsize=1,
|
|
block=False, headers=None,
|
|
_proxy=None, _proxy_headers=None,
|
|
key_file=None, cert_file=None, cert_reqs=None,
|
|
ca_certs=None, ssl_version=None,
|
|
assert_hostname=None, assert_fingerprint=None,
|
|
**conn_kw):
|
|
|
|
if sys.version_info < (2, 7): # Python 2.6 or older
|
|
conn_kw.pop('source_address', None)
|
|
|
|
HTTPConnectionPool.__init__(self, host, port, strict, timeout, maxsize,
|
|
block, headers, _proxy, _proxy_headers, **conn_kw)
|
|
self.key_file = key_file
|
|
self.cert_file = cert_file
|
|
self.cert_reqs = cert_reqs
|
|
self.ca_certs = ca_certs
|
|
self.ssl_version = ssl_version
|
|
self.assert_hostname = assert_hostname
|
|
self.assert_fingerprint = assert_fingerprint
|
|
self.conn_kw = conn_kw
|
|
|
|
def _prepare_conn(self, conn):
|
|
"""
|
|
Prepare the ``connection`` for :meth:`urllib3.util.ssl_wrap_socket`
|
|
and establish the tunnel if proxy is used.
|
|
"""
|
|
|
|
if isinstance(conn, VerifiedHTTPSConnection):
|
|
conn.set_cert(key_file=self.key_file,
|
|
cert_file=self.cert_file,
|
|
cert_reqs=self.cert_reqs,
|
|
ca_certs=self.ca_certs,
|
|
assert_hostname=self.assert_hostname,
|
|
assert_fingerprint=self.assert_fingerprint)
|
|
conn.ssl_version = self.ssl_version
|
|
conn.conn_kw = self.conn_kw
|
|
|
|
if self.proxy is not None:
|
|
# Python 2.7+
|
|
try:
|
|
set_tunnel = conn.set_tunnel
|
|
except AttributeError: # Platform-specific: Python 2.6
|
|
set_tunnel = conn._set_tunnel
|
|
set_tunnel(self.host, self.port, self.proxy_headers)
|
|
# Establish tunnel connection early, because otherwise httplib
|
|
# would improperly set Host: header to proxy's IP:port.
|
|
conn.connect()
|
|
|
|
return conn
|
|
|
|
def _new_conn(self):
|
|
"""
|
|
Return a fresh :class:`httplib.HTTPSConnection`.
|
|
"""
|
|
self.num_connections += 1
|
|
log.info("Starting new HTTPS connection (%d): %s"
|
|
% (self.num_connections, self.host))
|
|
|
|
if not self.ConnectionCls or self.ConnectionCls is DummyConnection:
|
|
# Platform-specific: Python without ssl
|
|
raise SSLError("Can't connect to HTTPS URL because the SSL "
|
|
"module is not available.")
|
|
|
|
actual_host = self.host
|
|
actual_port = self.port
|
|
if self.proxy is not None:
|
|
actual_host = self.proxy.host
|
|
actual_port = self.proxy.port
|
|
|
|
extra_params = {}
|
|
if not six.PY3: # Python 2
|
|
extra_params['strict'] = self.strict
|
|
extra_params.update(self.conn_kw)
|
|
|
|
conn = self.ConnectionCls(host=actual_host, port=actual_port,
|
|
timeout=self.timeout.connect_timeout,
|
|
**extra_params)
|
|
if self.proxy is not None:
|
|
# Enable Nagle's algorithm for proxies, to avoid packet
|
|
# fragmentation.
|
|
conn.tcp_nodelay = 0
|
|
|
|
return self._prepare_conn(conn)
|
|
|
|
|
|
def connection_from_url(url, **kw):
|
|
"""
|
|
Given a url, return an :class:`.ConnectionPool` instance of its host.
|
|
|
|
This is a shortcut for not having to parse out the scheme, host, and port
|
|
of the url before creating an :class:`.ConnectionPool` instance.
|
|
|
|
:param url:
|
|
Absolute URL string that must include the scheme. Port is optional.
|
|
|
|
:param \**kw:
|
|
Passes additional parameters to the constructor of the appropriate
|
|
:class:`.ConnectionPool`. Useful for specifying things like
|
|
timeout, maxsize, headers, etc.
|
|
|
|
Example: ::
|
|
|
|
>>> conn = connection_from_url('http://google.com/')
|
|
>>> r = conn.request('GET', '/')
|
|
"""
|
|
scheme, host, port = get_host(url)
|
|
if scheme == 'https':
|
|
return HTTPSConnectionPool(host, port=port, **kw)
|
|
else:
|
|
return HTTPConnectionPool(host, port=port, **kw)
|