Edit: connectionpool.py
from __future__ import absolute_import import errno import logging import socket import sys import warnings from socket import error as SocketError from socket import timeout as SocketTimeout from .connection import ( BaseSSLError, BrokenPipeError, DummyConnection, HTTPConnection, HTTPException, HTTPSConnection, VerifiedHTTPSConnection, port_by_scheme, ) from .exceptions import ( ClosedPoolError, EmptyPoolError, HeaderParsingError, HostChangedError, InsecureRequestWarning, LocationValueError, MaxRetryError, NewConnectionError, ProtocolError, ProxyError, ReadTimeoutError, SSLError, TimeoutError, ) from .packages import six from .packages.six.moves import queue from .packages.ssl_match_hostname import CertificateError from .request import RequestMethods from .response import HTTPResponse from .util.connection import is_connection_dropped from .util.proxy import connection_requires_http_tunnel from .util.queue import LifoQueue from .util.request import set_file_position from .util.response import assert_header_parsing from .util.retry import Retry from .util.timeout import Timeout from .util.url import Url, _encode_target from .util.url import _normalize_host as normalize_host from .util.url import get_host, parse_url 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`. .. note:: ConnectionPool.urlopen() does not normalize or percent-encode target URIs which is useful if your target server doesn't support percent-encoded target URIs. """ scheme = None QueueCls = LifoQueue def __init__(self, host, port=None): if not host: raise LocationValueError("No host specified.") self.host = _normalize_host(host, scheme=self.scheme) self._proxy_host = host.lower() self.port = port def __str__(self): return "%s(host=%r, port=%r)" % (type(self).__name__, self.host, self.port) def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): self.close() # Return False to re-raise any potential exceptions return False def close(self): """ Close all pooled connections and disable the pool. """ pass # This is taken from http://hg.python.org/cpython/file/7aaba721ebc0/Lib/socket.py#l252 _blocking_errnos = {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:`http.client.HTTPConnection`. :param port: Port used for this HTTP Connection (None is equivalent to 80), passed into :class:`http.client.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:`http.client.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 retries: Retry configuration to use by default with requests in this pool. :param _proxy: Parsed proxy URL, should not be used directly, instead, see :class:`urllib3.ProxyManager` :param _proxy_headers: A dictionary with proxy headers, should not be used directly, instead, see :class:`urllib3.ProxyManager` :param \\**conn_kw: Additional parameters are used to create fresh :class:`urllib3.connection.HTTPConnection`, :class:`urllib3.connection.HTTPSConnection` instances. """ scheme = "http" ConnectionCls = HTTPConnection ResponseCls = HTTPResponse 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, _proxy_config=None, **conn_kw ): ConnectionPool.__init__(self, host, port) RequestMethods.__init__(self, headers) self.strict = strict if not isinstance(timeout, Timeout): timeout = Timeout.from_float(timeout) if retries is None: retries = Retry.DEFAULT self.timeout = timeout self.retries = retries self.pool = self.QueueCls(maxsize) self.block = block self.proxy = _proxy self.proxy_headers = _proxy_headers or {} self.proxy_config = _proxy_config # 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 self.conn_kw = conn_kw if self.proxy: # Enable Nagle's algorithm for proxies, to avoid packet fragmentation. # We cannot know if the user has added default socket options, so we cannot replace the # list. self.conn_kw.setdefault("socket_options", []) self.conn_kw["proxy"] = self.proxy self.conn_kw["proxy_config"] = self.proxy_config def _new_conn(self): """ Return a fresh :class:`HTTPConnection`. """ self.num_connections += 1 log.debug( "Starting new HTTP connection (%d): %s:%s", self.num_connections, self.host, self.port or "80", ) conn = self.ConnectionCls( host=self.host, port=self.port, timeout=self.timeout.connect_timeout, strict=self.strict, **self.conn_kw ) 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 queue.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.debug("Resetting dropped connection: %s", self.host) conn.close() if getattr(conn, "auto_open", 1) == 0: # This is a proxied connection that has been mutated by # http.client._tunnel() and cannot be reused (since it would # attempt to bypass the proxy) conn = None 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 queue.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 _validate_conn(self, conn): """ Called right before a request is made, after the socket is created. """ pass def _prepare_proxy(self, conn): # Nothing to do for HTTP connections. pass 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 _raise_timeout(self, err, url, timeout_value): """Is the error actually a timeout? Will raise a ReadTimeout or pass""" if isinstance(err, SocketTimeout): raise ReadTimeoutError( self, url, "Read timed out. (read timeout=%s)" % timeout_value ) # See the above comment about EAGAIN in Python 3. In Python 2 we have # to specifically catch it and throw the timeout error if hasattr(err, "errno") and err.errno in _blocking_errnos: raise ReadTimeoutError( self, url, "Read timed out. (read timeout=%s)" % timeout_value ) # 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 raise ReadTimeoutError( self, url, "Read timed out. (read timeout=%s)" % timeout_value ) def _make_request( 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_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 try: while True: conn = old_pool.get(block=False) if conn: conn.close() except queue.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) 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 if 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.getheader("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, ) 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
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