1133 lines
39 KiB
Python
1133 lines
39 KiB
Python
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from __future__ import absolute_import
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import errno
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import logging
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import re
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import socket
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import sys
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import warnings
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from socket import error as SocketError
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from socket import timeout as SocketTimeout
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from .connection import (
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BaseSSLError,
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BrokenPipeError,
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DummyConnection,
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HTTPConnection,
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HTTPException,
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HTTPSConnection,
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VerifiedHTTPSConnection,
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port_by_scheme,
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)
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from .exceptions import (
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ClosedPoolError,
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EmptyPoolError,
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HeaderParsingError,
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HostChangedError,
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InsecureRequestWarning,
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LocationValueError,
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MaxRetryError,
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NewConnectionError,
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ProtocolError,
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ProxyError,
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ReadTimeoutError,
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SSLError,
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TimeoutError,
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)
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from .packages import six
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from .packages.six.moves import queue
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from .request import RequestMethods
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from .response import HTTPResponse
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from .util.connection import is_connection_dropped
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from .util.proxy import connection_requires_http_tunnel
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from .util.queue import LifoQueue
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from .util.request import set_file_position
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from .util.response import assert_header_parsing
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from .util.retry import Retry
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from .util.ssl_match_hostname import CertificateError
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from .util.timeout import Timeout
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from .util.url import Url, _encode_target
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from .util.url import _normalize_host as normalize_host
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from .util.url import get_host, parse_url
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try: # Platform-specific: Python 3
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import weakref
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weakref_finalize = weakref.finalize
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except AttributeError: # Platform-specific: Python 2
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from .packages.backports.weakref_finalize import weakref_finalize
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xrange = six.moves.xrange
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log = logging.getLogger(__name__)
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_Default = object()
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# Pool objects
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class ConnectionPool(object):
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"""
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Base class for all connection pools, such as
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:class:`.HTTPConnectionPool` and :class:`.HTTPSConnectionPool`.
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.. note::
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ConnectionPool.urlopen() does not normalize or percent-encode target URIs
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which is useful if your target server doesn't support percent-encoded
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target URIs.
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"""
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scheme = None
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QueueCls = LifoQueue
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def __init__(self, host, port=None):
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if not host:
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raise LocationValueError("No host specified.")
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self.host = _normalize_host(host, scheme=self.scheme)
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self._proxy_host = host.lower()
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self.port = port
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def __str__(self):
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return "%s(host=%r, port=%r)" % (type(self).__name__, self.host, self.port)
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.close()
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# Return False to re-raise any potential exceptions
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return False
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def close(self):
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"""
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Close all pooled connections and disable the pool.
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"""
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pass
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# This is taken from http://hg.python.org/cpython/file/7aaba721ebc0/Lib/socket.py#l252
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_blocking_errnos = {errno.EAGAIN, errno.EWOULDBLOCK}
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class HTTPConnectionPool(ConnectionPool, RequestMethods):
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"""
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Thread-safe connection pool for one host.
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:param host:
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Host used for this HTTP Connection (e.g. "localhost"), passed into
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:class:`http.client.HTTPConnection`.
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:param port:
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Port used for this HTTP Connection (None is equivalent to 80), passed
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into :class:`http.client.HTTPConnection`.
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:param strict:
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Causes BadStatusLine to be raised if the status line can't be parsed
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as a valid HTTP/1.0 or 1.1 status line, passed into
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:class:`http.client.HTTPConnection`.
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.. note::
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Only works in Python 2. This parameter is ignored in Python 3.
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:param timeout:
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Socket timeout in seconds for each individual connection. This can
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be a float or integer, which sets the timeout for the HTTP request,
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or an instance of :class:`urllib3.util.Timeout` which gives you more
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fine-grained control over request timeouts. After the constructor has
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been parsed, this is always a `urllib3.util.Timeout` object.
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:param maxsize:
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Number of connections to save that can be reused. More than 1 is useful
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in multithreaded situations. If ``block`` is set to False, more
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connections will be created but they will not be saved once they've
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been used.
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:param block:
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If set to True, no more than ``maxsize`` connections will be used at
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a time. When no free connections are available, the call will block
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until a connection has been released. This is a useful side effect for
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particular multithreaded situations where one does not want to use more
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than maxsize connections per host to prevent flooding.
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:param headers:
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Headers to include with all requests, unless other headers are given
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explicitly.
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:param retries:
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Retry configuration to use by default with requests in this pool.
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:param _proxy:
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Parsed proxy URL, should not be used directly, instead, see
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:class:`urllib3.ProxyManager`
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:param _proxy_headers:
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A dictionary with proxy headers, should not be used directly,
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instead, see :class:`urllib3.ProxyManager`
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:param \\**conn_kw:
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Additional parameters are used to create fresh :class:`urllib3.connection.HTTPConnection`,
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:class:`urllib3.connection.HTTPSConnection` instances.
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"""
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scheme = "http"
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ConnectionCls = HTTPConnection
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ResponseCls = HTTPResponse
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def __init__(
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self,
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host,
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port=None,
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strict=False,
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timeout=Timeout.DEFAULT_TIMEOUT,
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maxsize=1,
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block=False,
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headers=None,
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retries=None,
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_proxy=None,
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_proxy_headers=None,
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_proxy_config=None,
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**conn_kw
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):
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ConnectionPool.__init__(self, host, port)
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RequestMethods.__init__(self, headers)
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self.strict = strict
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if not isinstance(timeout, Timeout):
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timeout = Timeout.from_float(timeout)
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if retries is None:
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retries = Retry.DEFAULT
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self.timeout = timeout
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self.retries = retries
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self.pool = self.QueueCls(maxsize)
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self.block = block
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self.proxy = _proxy
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self.proxy_headers = _proxy_headers or {}
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self.proxy_config = _proxy_config
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# Fill the queue up so that doing get() on it will block properly
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for _ in xrange(maxsize):
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self.pool.put(None)
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# These are mostly for testing and debugging purposes.
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self.num_connections = 0
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self.num_requests = 0
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self.conn_kw = conn_kw
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if self.proxy:
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# Enable Nagle's algorithm for proxies, to avoid packet fragmentation.
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# We cannot know if the user has added default socket options, so we cannot replace the
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# list.
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self.conn_kw.setdefault("socket_options", [])
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self.conn_kw["proxy"] = self.proxy
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self.conn_kw["proxy_config"] = self.proxy_config
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# Do not pass 'self' as callback to 'finalize'.
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# Then the 'finalize' would keep an endless living (leak) to self.
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# By just passing a reference to the pool allows the garbage collector
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# to free self if nobody else has a reference to it.
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pool = self.pool
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# Close all the HTTPConnections in the pool before the
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# HTTPConnectionPool object is garbage collected.
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weakref_finalize(self, _close_pool_connections, pool)
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def _new_conn(self):
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"""
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Return a fresh :class:`HTTPConnection`.
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"""
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self.num_connections += 1
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log.debug(
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"Starting new HTTP connection (%d): %s:%s",
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self.num_connections,
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self.host,
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self.port or "80",
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)
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conn = self.ConnectionCls(
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host=self.host,
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port=self.port,
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timeout=self.timeout.connect_timeout,
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strict=self.strict,
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**self.conn_kw
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)
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return conn
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def _get_conn(self, timeout=None):
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"""
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Get a connection. Will return a pooled connection if one is available.
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If no connections are available and :prop:`.block` is ``False``, then a
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fresh connection is returned.
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:param timeout:
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Seconds to wait before giving up and raising
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:class:`urllib3.exceptions.EmptyPoolError` if the pool is empty and
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:prop:`.block` is ``True``.
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"""
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conn = None
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try:
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conn = self.pool.get(block=self.block, timeout=timeout)
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except AttributeError: # self.pool is None
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raise ClosedPoolError(self, "Pool is closed.")
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except queue.Empty:
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if self.block:
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raise EmptyPoolError(
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self,
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"Pool reached maximum size and no more connections are allowed.",
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)
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pass # Oh well, we'll create a new connection then
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# If this is a persistent connection, check if it got disconnected
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if conn and is_connection_dropped(conn):
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log.debug("Resetting dropped connection: %s", self.host)
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conn.close()
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if getattr(conn, "auto_open", 1) == 0:
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# This is a proxied connection that has been mutated by
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# http.client._tunnel() and cannot be reused (since it would
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# attempt to bypass the proxy)
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conn = None
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return conn or self._new_conn()
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def _put_conn(self, conn):
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"""
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Put a connection back into the pool.
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:param conn:
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Connection object for the current host and port as returned by
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:meth:`._new_conn` or :meth:`._get_conn`.
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If the pool is already full, the connection is closed and discarded
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because we exceeded maxsize. If connections are discarded frequently,
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then maxsize should be increased.
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If the pool is closed, then the connection will be closed and discarded.
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"""
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try:
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self.pool.put(conn, block=False)
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return # Everything is dandy, done.
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except AttributeError:
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# self.pool is None.
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pass
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except queue.Full:
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# This should never happen if self.block == True
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log.warning(
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"Connection pool is full, discarding connection: %s. Connection pool size: %s",
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self.host,
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self.pool.qsize(),
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)
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# Connection never got put back into the pool, close it.
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if conn:
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conn.close()
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def _validate_conn(self, conn):
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|
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"""
|
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Called right before a request is made, after the socket is created.
|
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"""
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pass
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def _prepare_proxy(self, conn):
|
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|
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# Nothing to do for HTTP connections.
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pass
|
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|
|
|
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|
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def _get_timeout(self, timeout):
|
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|
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"""Helper that always returns a :class:`urllib3.util.Timeout`"""
|
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|
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if timeout is _Default:
|
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|
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return self.timeout.clone()
|
||
|
|
|
||
|
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if isinstance(timeout, Timeout):
|
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|
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return timeout.clone()
|
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|
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else:
|
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|
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# User passed us an int/float. This is for backwards compatibility,
|
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|
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# can be removed later
|
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return Timeout.from_float(timeout)
|
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|
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|
||
|
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def _raise_timeout(self, err, url, timeout_value):
|
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|
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"""Is the error actually a timeout? Will raise a ReadTimeout or pass"""
|
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|
|
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if isinstance(err, SocketTimeout):
|
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raise ReadTimeoutError(
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self, url, "Read timed out. (read timeout=%s)" % timeout_value
|
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)
|
||
|
|
|
||
|
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# See the above comment about EAGAIN in Python 3. In Python 2 we have
|
||
|
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# to specifically catch it and throw the timeout error
|
||
|
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if hasattr(err, "errno") and err.errno in _blocking_errnos:
|
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|
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raise ReadTimeoutError(
|
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|
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self, url, "Read timed out. (read timeout=%s)" % timeout_value
|
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)
|
||
|
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|
||
|
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# 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(err) or "did not complete (read)" in str(
|
||
|
|
err
|
||
|
|
): # Python < 2.7.4
|
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|
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raise ReadTimeoutError(
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|
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self, url, "Read timed out. (read timeout=%s)" % timeout_value
|
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)
|
||
|
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|
||
|
|
def _make_request(
|
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|
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self, conn, method, url, timeout=_Default, chunked=False, **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)
|
||
|
|
timeout_obj.start_connect()
|
||
|
|
conn.timeout = Timeout.resolve_default_timeout(timeout_obj.connect_timeout)
|
||
|
|
|
||
|
|
# Trigger any extra validation we need to do.
|
||
|
|
try:
|
||
|
|
self._validate_conn(conn)
|
||
|
|
except (SocketTimeout, BaseSSLError) as e:
|
||
|
|
# Py2 raises this as a BaseSSLError, Py3 raises it as socket timeout.
|
||
|
|
self._raise_timeout(err=e, url=url, timeout_value=conn.timeout)
|
||
|
|
raise
|
||
|
|
|
||
|
|
# conn.request() calls http.client.*.request, not the method in
|
||
|
|
# urllib3.request. It also calls makefile (recv) on the socket.
|
||
|
|
try:
|
||
|
|
if chunked:
|
||
|
|
conn.request_chunked(method, url, **httplib_request_kw)
|
||
|
|
else:
|
||
|
|
conn.request(method, url, **httplib_request_kw)
|
||
|
|
|
||
|
|
# We are swallowing BrokenPipeError (errno.EPIPE) since the server is
|
||
|
|
# legitimately able to close the connection after sending a valid response.
|
||
|
|
# With this behaviour, the received response is still readable.
|
||
|
|
except BrokenPipeError:
|
||
|
|
# Python 3
|
||
|
|
pass
|
||
|
|
except IOError as e:
|
||
|
|
# Python 2 and macOS/Linux
|
||
|
|
# EPIPE and ESHUTDOWN are BrokenPipeError on Python 2, and EPROTOTYPE is needed on macOS
|
||
|
|
# https://erickt.github.io/blog/2014/11/19/adventures-in-debugging-a-potential-osx-kernel-bug/
|
||
|
|
if e.errno not in {
|
||
|
|
errno.EPIPE,
|
||
|
|
errno.ESHUTDOWN,
|
||
|
|
errno.EPROTOTYPE,
|
||
|
|
}:
|
||
|
|
raise
|
||
|
|
|
||
|
|
# Reset the timeout for the recv() on the socket
|
||
|
|
read_timeout = timeout_obj.read_timeout
|
||
|
|
|
||
|
|
# App Engine doesn't have a sock attr
|
||
|
|
if getattr(conn, "sock", None):
|
||
|
|
# 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 3
|
||
|
|
try:
|
||
|
|
httplib_response = conn.getresponse()
|
||
|
|
except BaseException as e:
|
||
|
|
# Remove the TypeError from the exception chain in
|
||
|
|
# Python 3 (including for exceptions like SystemExit).
|
||
|
|
# Otherwise it looks like a bug in the code.
|
||
|
|
six.raise_from(e, None)
|
||
|
|
except (SocketTimeout, BaseSSLError, SocketError) as e:
|
||
|
|
self._raise_timeout(err=e, url=url, timeout_value=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 %s" %s %s',
|
||
|
|
self.scheme,
|
||
|
|
self.host,
|
||
|
|
self.port,
|
||
|
|
method,
|
||
|
|
url,
|
||
|
|
http_version,
|
||
|
|
httplib_response.status,
|
||
|
|
httplib_response.length,
|
||
|
|
)
|
||
|
|
|
||
|
|
try:
|
||
|
|
assert_header_parsing(httplib_response.msg)
|
||
|
|
except (HeaderParsingError, TypeError) as hpe: # Platform-specific: Python 3
|
||
|
|
log.warning(
|
||
|
|
"Failed to parse headers (url=%s): %s",
|
||
|
|
self._absolute_url(url),
|
||
|
|
hpe,
|
||
|
|
exc_info=True,
|
||
|
|
)
|
||
|
|
|
||
|
|
return httplib_response
|
||
|
|
|
||
|
|
def _absolute_url(self, path):
|
||
|
|
return Url(scheme=self.scheme, host=self.host, port=self.port, path=path).url
|
||
|
|
|
||
|
|
def close(self):
|
||
|
|
"""
|
||
|
|
Close all pooled connections and disable the pool.
|
||
|
|
"""
|
||
|
|
if self.pool is None:
|
||
|
|
return
|
||
|
|
# Disable access to the pool
|
||
|
|
old_pool, self.pool = self.pool, None
|
||
|
|
|
||
|
|
# Close all the HTTPConnections in the pool.
|
||
|
|
_close_pool_connections(old_pool)
|
||
|
|
|
||
|
|
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)
|
||
|
|
if host is not None:
|
||
|
|
host = _normalize_host(host, scheme=scheme)
|
||
|
|
|
||
|
|
# 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=None,
|
||
|
|
redirect=True,
|
||
|
|
assert_same_host=True,
|
||
|
|
timeout=_Default,
|
||
|
|
pool_timeout=None,
|
||
|
|
release_conn=None,
|
||
|
|
chunked=False,
|
||
|
|
body_pos=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 url:
|
||
|
|
The URL to perform the request on.
|
||
|
|
|
||
|
|
:param body:
|
||
|
|
Data to send in the request body, either :class:`str`, :class:`bytes`,
|
||
|
|
an iterable of :class:`str`/:class:`bytes`, or a file-like object.
|
||
|
|
|
||
|
|
: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:
|
||
|
|
Configure the number of retries to allow before raising a
|
||
|
|
:class:`~urllib3.exceptions.MaxRetryError` exception.
|
||
|
|
|
||
|
|
Pass ``None`` to retry until you receive a response. Pass a
|
||
|
|
:class:`~urllib3.util.retry.Retry` object for fine-grained control
|
||
|
|
over different types of retries.
|
||
|
|
Pass an integer number to retry connection errors that many times,
|
||
|
|
but no other types of errors. Pass zero to never retry.
|
||
|
|
|
||
|
|
If ``False``, then retries are disabled and any exception is raised
|
||
|
|
immediately. Also, instead of raising a MaxRetryError on redirects,
|
||
|
|
the redirect response will be returned.
|
||
|
|
|
||
|
|
:type retries: :class:`~urllib3.util.retry.Retry`, False, or an int.
|
||
|
|
|
||
|
|
: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 chunked:
|
||
|
|
If True, urllib3 will send the body using chunked transfer
|
||
|
|
encoding. Otherwise, urllib3 will send the body using the standard
|
||
|
|
content-length form. Defaults to False.
|
||
|
|
|
||
|
|
:param int body_pos:
|
||
|
|
Position to seek to in file-like body in the event of a retry or
|
||
|
|
redirect. Typically this won't need to be set because urllib3 will
|
||
|
|
auto-populate the value when needed.
|
||
|
|
|
||
|
|
:param \\**response_kw:
|
||
|
|
Additional parameters are passed to
|
||
|
|
:meth:`urllib3.response.HTTPResponse.from_httplib`
|
||
|
|
"""
|
||
|
|
|
||
|
|
parsed_url = parse_url(url)
|
||
|
|
destination_scheme = parsed_url.scheme
|
||
|
|
|
||
|
|
if headers is None:
|
||
|
|
headers = self.headers
|
||
|
|
|
||
|
|
if not isinstance(retries, Retry):
|
||
|
|
retries = Retry.from_int(retries, redirect=redirect, default=self.retries)
|
||
|
|
|
||
|
|
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)
|
||
|
|
|
||
|
|
# Ensure that the URL we're connecting to is properly encoded
|
||
|
|
if url.startswith("/"):
|
||
|
|
url = six.ensure_str(_encode_target(url))
|
||
|
|
else:
|
||
|
|
url = six.ensure_str(parsed_url.url)
|
||
|
|
|
||
|
|
conn = None
|
||
|
|
|
||
|
|
# Track whether `conn` needs to be released before
|
||
|
|
# returning/raising/recursing. Update this variable if necessary, and
|
||
|
|
# leave `release_conn` constant throughout the function. That way, if
|
||
|
|
# the function recurses, the original value of `release_conn` will be
|
||
|
|
# passed down into the recursive call, and its value will be respected.
|
||
|
|
#
|
||
|
|
# See issue #651 [1] for details.
|
||
|
|
#
|
||
|
|
# [1] <https://github.com/urllib3/urllib3/issues/651>
|
||
|
|
release_this_conn = release_conn
|
||
|
|
|
||
|
|
http_tunnel_required = connection_requires_http_tunnel(
|
||
|
|
self.proxy, self.proxy_config, destination_scheme
|
||
|
|
)
|
||
|
|
|
||
|
|
# Merge the proxy headers. Only done when not using HTTP CONNECT. We
|
||
|
|
# have to copy the headers dict so we can safely change it without those
|
||
|
|
# changes being reflected in anyone else's copy.
|
||
|
|
if not http_tunnel_required:
|
||
|
|
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
|
||
|
|
|
||
|
|
# Keep track of whether we cleanly exited the except block. This
|
||
|
|
# ensures we do proper cleanup in finally.
|
||
|
|
clean_exit = False
|
||
|
|
|
||
|
|
# Rewind body position, if needed. Record current position
|
||
|
|
# for future rewinds in the event of a redirect/retry.
|
||
|
|
body_pos = set_file_position(body, body_pos)
|
||
|
|
|
||
|
|
try:
|
||
|
|
# Request a connection from the queue.
|
||
|
|
timeout_obj = self._get_timeout(timeout)
|
||
|
|
conn = self._get_conn(timeout=pool_timeout)
|
||
|
|
|
||
|
|
conn.timeout = timeout_obj.connect_timeout
|
||
|
|
|
||
|
|
is_new_proxy_conn = self.proxy is not None and not getattr(
|
||
|
|
conn, "sock", None
|
||
|
|
)
|
||
|
|
if is_new_proxy_conn and http_tunnel_required:
|
||
|
|
self._prepare_proxy(conn)
|
||
|
|
|
||
|
|
# Make the request on the httplib connection object.
|
||
|
|
httplib_response = self._make_request(
|
||
|
|
conn,
|
||
|
|
method,
|
||
|
|
url,
|
||
|
|
timeout=timeout_obj,
|
||
|
|
body=body,
|
||
|
|
headers=headers,
|
||
|
|
chunked=chunked,
|
||
|
|
)
|
||
|
|
|
||
|
|
# If we're going to release the connection in ``finally:``, then
|
||
|
|
# the response 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 = conn if not release_conn else None
|
||
|
|
|
||
|
|
# Pass method to Response for length checking
|
||
|
|
response_kw["request_method"] = method
|
||
|
|
|
||
|
|
# Import httplib's response into our own wrapper object
|
||
|
|
response = self.ResponseCls.from_httplib(
|
||
|
|
httplib_response,
|
||
|
|
pool=self,
|
||
|
|
connection=response_conn,
|
||
|
|
retries=retries,
|
||
|
|
**response_kw
|
||
|
|
)
|
||
|
|
|
||
|
|
# Everything went great!
|
||
|
|
clean_exit = True
|
||
|
|
|
||
|
|
except EmptyPoolError:
|
||
|
|
# Didn't get a connection from the pool, no need to clean up
|
||
|
|
clean_exit = True
|
||
|
|
release_this_conn = False
|
||
|
|
raise
|
||
|
|
|
||
|
|
except (
|
||
|
|
TimeoutError,
|
||
|
|
HTTPException,
|
||
|
|
SocketError,
|
||
|
|
ProtocolError,
|
||
|
|
BaseSSLError,
|
||
|
|
SSLError,
|
||
|
|
CertificateError,
|
||
|
|
) as e:
|
||
|
|
# Discard the connection for these exceptions. It will be
|
||
|
|
# replaced during the next _get_conn() call.
|
||
|
|
clean_exit = False
|
||
|
|
|
||
|
|
def _is_ssl_error_message_from_http_proxy(ssl_error):
|
||
|
|
# We're trying to detect the message 'WRONG_VERSION_NUMBER' but
|
||
|
|
# SSLErrors are kinda all over the place when it comes to the message,
|
||
|
|
# so we try to cover our bases here!
|
||
|
|
message = " ".join(re.split("[^a-z]", str(ssl_error).lower()))
|
||
|
|
return (
|
||
|
|
"wrong version number" in message or "unknown protocol" in message
|
||
|
|
)
|
||
|
|
|
||
|
|
# Try to detect a common user error with proxies which is to
|
||
|
|
# set an HTTP proxy to be HTTPS when it should be 'http://'
|
||
|
|
# (ie {'http': 'http://proxy', 'https': 'https://proxy'})
|
||
|
|
# Instead we add a nice error message and point to a URL.
|
||
|
|
if (
|
||
|
|
isinstance(e, BaseSSLError)
|
||
|
|
and self.proxy
|
||
|
|
and _is_ssl_error_message_from_http_proxy(e)
|
||
|
|
and conn.proxy
|
||
|
|
and conn.proxy.scheme == "https"
|
||
|
|
):
|
||
|
|
e = ProxyError(
|
||
|
|
"Your proxy appears to only use HTTP and not HTTPS, "
|
||
|
|
"try changing your proxy URL to be HTTP. See: "
|
||
|
|
"https://urllib3.readthedocs.io/en/1.26.x/advanced-usage.html"
|
||
|
|
"#https-proxy-error-http-proxy",
|
||
|
|
SSLError(e),
|
||
|
|
)
|
||
|
|
elif isinstance(e, (BaseSSLError, CertificateError)):
|
||
|
|
e = SSLError(e)
|
||
|
|
elif isinstance(e, (SocketError, NewConnectionError)) and self.proxy:
|
||
|
|
e = ProxyError("Cannot connect to proxy.", e)
|
||
|
|
elif isinstance(e, (SocketError, HTTPException)):
|
||
|
|
e = ProtocolError("Connection aborted.", e)
|
||
|
|
|
||
|
|
retries = retries.increment(
|
||
|
|
method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
|
||
|
|
)
|
||
|
|
retries.sleep()
|
||
|
|
|
||
|
|
# Keep track of the error for the retry warning.
|
||
|
|
err = e
|
||
|
|
|
||
|
|
finally:
|
||
|
|
if not clean_exit:
|
||
|
|
# We hit some kind of exception, handled or otherwise. We need
|
||
|
|
# to throw the connection away unless explicitly told not to.
|
||
|
|
# Close the connection, set the variable to None, and make sure
|
||
|
|
# we put the None back in the pool to avoid leaking it.
|
||
|
|
conn = conn and conn.close()
|
||
|
|
release_this_conn = True
|
||
|
|
|
||
|
|
if release_this_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 (%r) after connection broken by '%r': %s", retries, err, url
|
||
|
|
)
|
||
|
|
return self.urlopen(
|
||
|
|
method,
|
||
|
|
url,
|
||
|
|
body,
|
||
|
|
headers,
|
||
|
|
retries,
|
||
|
|
redirect,
|
||
|
|
assert_same_host,
|
||
|
|
timeout=timeout,
|
||
|
|
pool_timeout=pool_timeout,
|
||
|
|
release_conn=release_conn,
|
||
|
|
chunked=chunked,
|
||
|
|
body_pos=body_pos,
|
||
|
|
**response_kw
|
||
|
|
)
|
||
|
|
|
||
|
|
# Handle redirect?
|
||
|
|
redirect_location = redirect and response.get_redirect_location()
|
||
|
|
if redirect_location:
|
||
|
|
if response.status == 303:
|
||
|
|
method = "GET"
|
||
|
|
|
||
|
|
try:
|
||
|
|
retries = retries.increment(method, url, response=response, _pool=self)
|
||
|
|
except MaxRetryError:
|
||
|
|
if retries.raise_on_redirect:
|
||
|
|
response.drain_conn()
|
||
|
|
raise
|
||
|
|
return response
|
||
|
|
|
||
|
|
response.drain_conn()
|
||
|
|
retries.sleep_for_retry(response)
|
||
|
|
log.debug("Redirecting %s -> %s", url, redirect_location)
|
||
|
|
return self.urlopen(
|
||
|
|
method,
|
||
|
|
redirect_location,
|
||
|
|
body,
|
||
|
|
headers,
|
||
|
|
retries=retries,
|
||
|
|
redirect=redirect,
|
||
|
|
assert_same_host=assert_same_host,
|
||
|
|
timeout=timeout,
|
||
|
|
pool_timeout=pool_timeout,
|
||
|
|
release_conn=release_conn,
|
||
|
|
chunked=chunked,
|
||
|
|
body_pos=body_pos,
|
||
|
|
**response_kw
|
||
|
|
)
|
||
|
|
|
||
|
|
# Check if we should retry the HTTP response.
|
||
|
|
has_retry_after = bool(response.headers.get("Retry-After"))
|
||
|
|
if retries.is_retry(method, response.status, has_retry_after):
|
||
|
|
try:
|
||
|
|
retries = retries.increment(method, url, response=response, _pool=self)
|
||
|
|
except MaxRetryError:
|
||
|
|
if retries.raise_on_status:
|
||
|
|
response.drain_conn()
|
||
|
|
raise
|
||
|
|
return response
|
||
|
|
|
||
|
|
response.drain_conn()
|
||
|
|
retries.sleep(response)
|
||
|
|
log.debug("Retry: %s", url)
|
||
|
|
return self.urlopen(
|
||
|
|
method,
|
||
|
|
url,
|
||
|
|
body,
|
||
|
|
headers,
|
||
|
|
retries=retries,
|
||
|
|
redirect=redirect,
|
||
|
|
assert_same_host=assert_same_host,
|
||
|
|
timeout=timeout,
|
||
|
|
pool_timeout=pool_timeout,
|
||
|
|
release_conn=release_conn,
|
||
|
|
chunked=chunked,
|
||
|
|
body_pos=body_pos,
|
||
|
|
**response_kw
|
||
|
|
)
|
||
|
|
|
||
|
|
return response
|
||
|
|
|
||
|
|
|
||
|
|
class HTTPSConnectionPool(HTTPConnectionPool):
|
||
|
|
"""
|
||
|
|
Same as :class:`.HTTPConnectionPool`, but HTTPS.
|
||
|
|
|
||
|
|
:class:`.HTTPSConnection` 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``,
|
||
|
|
``ca_cert_dir``, ``ssl_version``, ``key_password`` 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=Timeout.DEFAULT_TIMEOUT,
|
||
|
|
maxsize=1,
|
||
|
|
block=False,
|
||
|
|
headers=None,
|
||
|
|
retries=None,
|
||
|
|
_proxy=None,
|
||
|
|
_proxy_headers=None,
|
||
|
|
key_file=None,
|
||
|
|
cert_file=None,
|
||
|
|
cert_reqs=None,
|
||
|
|
key_password=None,
|
||
|
|
ca_certs=None,
|
||
|
|
ssl_version=None,
|
||
|
|
assert_hostname=None,
|
||
|
|
assert_fingerprint=None,
|
||
|
|
ca_cert_dir=None,
|
||
|
|
**conn_kw
|
||
|
|
):
|
||
|
|
|
||
|
|
HTTPConnectionPool.__init__(
|
||
|
|
self,
|
||
|
|
host,
|
||
|
|
port,
|
||
|
|
strict,
|
||
|
|
timeout,
|
||
|
|
maxsize,
|
||
|
|
block,
|
||
|
|
headers,
|
||
|
|
retries,
|
||
|
|
_proxy,
|
||
|
|
_proxy_headers,
|
||
|
|
**conn_kw
|
||
|
|
)
|
||
|
|
|
||
|
|
self.key_file = key_file
|
||
|
|
self.cert_file = cert_file
|
||
|
|
self.cert_reqs = cert_reqs
|
||
|
|
self.key_password = key_password
|
||
|
|
self.ca_certs = ca_certs
|
||
|
|
self.ca_cert_dir = ca_cert_dir
|
||
|
|
self.ssl_version = ssl_version
|
||
|
|
self.assert_hostname = assert_hostname
|
||
|
|
self.assert_fingerprint = assert_fingerprint
|
||
|
|
|
||
|
|
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,
|
||
|
|
key_password=self.key_password,
|
||
|
|
cert_file=self.cert_file,
|
||
|
|
cert_reqs=self.cert_reqs,
|
||
|
|
ca_certs=self.ca_certs,
|
||
|
|
ca_cert_dir=self.ca_cert_dir,
|
||
|
|
assert_hostname=self.assert_hostname,
|
||
|
|
assert_fingerprint=self.assert_fingerprint,
|
||
|
|
)
|
||
|
|
conn.ssl_version = self.ssl_version
|
||
|
|
return conn
|
||
|
|
|
||
|
|
def _prepare_proxy(self, conn):
|
||
|
|
"""
|
||
|
|
Establishes a tunnel connection through HTTP CONNECT.
|
||
|
|
|
||
|
|
Tunnel connection is established early because otherwise httplib would
|
||
|
|
improperly set Host: header to proxy's IP:port.
|
||
|
|
"""
|
||
|
|
|
||
|
|
conn.set_tunnel(self._proxy_host, self.port, self.proxy_headers)
|
||
|
|
|
||
|
|
if self.proxy.scheme == "https":
|
||
|
|
conn.tls_in_tls_required = True
|
||
|
|
|
||
|
|
conn.connect()
|
||
|
|
|
||
|
|
def _new_conn(self):
|
||
|
|
"""
|
||
|
|
Return a fresh :class:`http.client.HTTPSConnection`.
|
||
|
|
"""
|
||
|
|
self.num_connections += 1
|
||
|
|
log.debug(
|
||
|
|
"Starting new HTTPS connection (%d): %s:%s",
|
||
|
|
self.num_connections,
|
||
|
|
self.host,
|
||
|
|
self.port or "443",
|
||
|
|
)
|
||
|
|
|
||
|
|
if not self.ConnectionCls or self.ConnectionCls is DummyConnection:
|
||
|
|
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
|
||
|
|
|
||
|
|
conn = self.ConnectionCls(
|
||
|
|
host=actual_host,
|
||
|
|
port=actual_port,
|
||
|
|
timeout=self.timeout.connect_timeout,
|
||
|
|
strict=self.strict,
|
||
|
|
cert_file=self.cert_file,
|
||
|
|
key_file=self.key_file,
|
||
|
|
key_password=self.key_password,
|
||
|
|
**self.conn_kw
|
||
|
|
)
|
||
|
|
|
||
|
|
return self._prepare_conn(conn)
|
||
|
|
|
||
|
|
def _validate_conn(self, conn):
|
||
|
|
"""
|
||
|
|
Called right before a request is made, after the socket is created.
|
||
|
|
"""
|
||
|
|
super(HTTPSConnectionPool, self)._validate_conn(conn)
|
||
|
|
|
||
|
|
# Force connect early to allow us to validate the connection.
|
||
|
|
if not getattr(conn, "sock", None): # AppEngine might not have `.sock`
|
||
|
|
conn.connect()
|
||
|
|
|
||
|
|
if not conn.is_verified:
|
||
|
|
warnings.warn(
|
||
|
|
(
|
||
|
|
"Unverified HTTPS request is being made to host '%s'. "
|
||
|
|
"Adding certificate verification is strongly advised. See: "
|
||
|
|
"https://urllib3.readthedocs.io/en/1.26.x/advanced-usage.html"
|
||
|
|
"#ssl-warnings" % conn.host
|
||
|
|
),
|
||
|
|
InsecureRequestWarning,
|
||
|
|
)
|
||
|
|
|
||
|
|
if getattr(conn, "proxy_is_verified", None) is False:
|
||
|
|
warnings.warn(
|
||
|
|
(
|
||
|
|
"Unverified HTTPS connection done to an HTTPS proxy. "
|
||
|
|
"Adding certificate verification is strongly advised. See: "
|
||
|
|
"https://urllib3.readthedocs.io/en/1.26.x/advanced-usage.html"
|
||
|
|
"#ssl-warnings"
|
||
|
|
),
|
||
|
|
InsecureRequestWarning,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
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)
|
||
|
|
port = port or port_by_scheme.get(scheme, 80)
|
||
|
|
if scheme == "https":
|
||
|
|
return HTTPSConnectionPool(host, port=port, **kw)
|
||
|
|
else:
|
||
|
|
return HTTPConnectionPool(host, port=port, **kw)
|
||
|
|
|
||
|
|
|
||
|
|
def _normalize_host(host, scheme):
|
||
|
|
"""
|
||
|
|
Normalize hosts for comparisons and use with sockets.
|
||
|
|
"""
|
||
|
|
|
||
|
|
host = normalize_host(host, scheme)
|
||
|
|
|
||
|
|
# httplib doesn't like it when we include brackets in IPv6 addresses
|
||
|
|
# Specifically, if we include brackets but also pass the port then
|
||
|
|
# httplib crazily doubles up the square brackets on the Host header.
|
||
|
|
# Instead, we need to make sure we never pass ``None`` as the port.
|
||
|
|
# However, for backward compatibility reasons we can't actually
|
||
|
|
# *assert* that. See http://bugs.python.org/issue28539
|
||
|
|
if host.startswith("[") and host.endswith("]"):
|
||
|
|
host = host[1:-1]
|
||
|
|
return host
|
||
|
|
|
||
|
|
|
||
|
|
def _close_pool_connections(pool):
|
||
|
|
"""Drains a queue of connections and closes each one."""
|
||
|
|
try:
|
||
|
|
while True:
|
||
|
|
conn = pool.get(block=False)
|
||
|
|
if conn:
|
||
|
|
conn.close()
|
||
|
|
except queue.Empty:
|
||
|
|
pass # Done.
|