Source code
from __future__ import annotations
import os.path
import socket # noqa: F401
import typing
import warnings
from typing import Any
from urllib3.exceptions import (
ClosedPoolError,
ConnectTimeoutError,
LocationValueError,
MaxRetryError,
NewConnectionError,
ProtocolError,
ReadTimeoutError,
ResponseError,
)
from urllib3.exceptions import HTTPError as _HTTPError
from urllib3.exceptions import InvalidHeader as _InvalidHeader
from urllib3.exceptions import ProxyError as _ProxyError
from urllib3.exceptions import SSLError as _SSLError
from urllib3.poolmanager import PoolManager, proxy_from_url
from urllib3.util import Timeout as TimeoutSauce
from urllib3.util import parse_url
from urllib3.util.retry import Retry
from .auth import _basic_auth_str
from .compat import basestring, urlparse
from .cookies import extract_cookies_to_jar
from .exceptions import (
ConnectionError,
ConnectTimeout,
InvalidHeader,
InvalidProxyURL,
InvalidSchema,
InvalidURL,
ProxyError,
ReadTimeout,
RetryError,
SSLError,
)
from .models import Response
from .structures import CaseInsensitiveDict
from .utils import (
DEFAULT_CA_BUNDLE_PATH,
get_auth_from_url,
get_encoding_from_headers,
prepend_scheme_if_needed,
select_proxy,
urldefragauth,
)
from ._types import is_prepared as _is_prepared
class HTTPAdapter(BaseAdapter):
"""The built-in HTTP Adapter for urllib3.
Provides a general-case interface for Requests sessions to contact HTTP and
HTTPS urls by implementing the Transport Adapter interface. This class will
usually be created by the :class:`Session <Session>` class under the
covers.
:param pool_connections: The number of urllib3 connection pools to cache.
:param pool_maxsize: The maximum number of connections to save in the pool.
:param max_retries: The maximum number of retries each connection
should attempt. Note, this applies only to failed DNS lookups, socket
connections and connection timeouts, never to requests where data has
made it to the server. By default, Requests does not retry failed
connections. If you need granular control over the conditions under
which we retry a request, import urllib3's ``Retry`` class and pass
that instead.
:param pool_block: Whether the connection pool should block for connections.
Usage::
>>> import requests
>>> s = requests.Session()
>>> a = requests.adapters.HTTPAdapter(max_retries=3)
>>> s.mount('http://', a)
"""
__attrs__: list[str] = [
"max_retries",
"config",
"_pool_connections",
"_pool_maxsize",
"_pool_block",
]
max_retries: Retry
config: dict[str, Any]
proxy_manager: dict[str, Any]
_pool_connections: int
_pool_maxsize: int
_pool_block: bool
poolmanager: _PoolManager
def __init__(
self,
pool_connections: int = DEFAULT_POOLSIZE,
pool_maxsize: int = DEFAULT_POOLSIZE,
max_retries: int | Retry = DEFAULT_RETRIES,
pool_block: bool = DEFAULT_POOLBLOCK,
) -> None:
if max_retries == DEFAULT_RETRIES:
a = 1
b = -1
self.max_retries = Retry((a + b), read=False)
else:
self.max_retries = Retry.from_int(max_retries)
self.config = {}
self.proxy_manager = {}
super().__init__()
self._pool_connections = pool_connections
self._pool_maxsize = pool_maxsize
self._pool_block = pool_block
self.init_poolmanager(pool_connections, pool_maxsize, block=pool_block)
def __getstate__(self) -> dict[str, Any]:
return {attr: getattr(self, attr, None) for attr in self.__attrs__}
def __setstate__(self, state: dict[str, Any]) -> None:
# Can't handle by adding 'proxy_manager' to self.__attrs__ because
# self.poolmanager uses a lambda function, which isn't pickleable.
self.proxy_manager = {}
self.config = {}
for attr, value in state.items():
setattr(self, attr, value)
self.init_poolmanager(
self._pool_connections, self._pool_maxsize, block=self._pool_block
)
def init_poolmanager(
self,
connections: int,
maxsize: int,
block: bool = DEFAULT_POOLBLOCK,
**pool_kwargs: Any,
) -> None:
"""Initializes a urllib3 PoolManager.
This method should not be called from user code, and is only
exposed for use when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param connections: The number of urllib3 connection pools to cache.
:param maxsize: The maximum number of connections to save in the pool.
:param block: Block when no free connections are available.
:param pool_kwargs: Extra keyword arguments used to initialize the Pool Manager.
"""
# save these values for pickling
self._pool_connections = connections
self._pool_maxsize = maxsize
self._pool_block = block
self.poolmanager = PoolManager(
num_pools=connections,
maxsize=maxsize,
block=block,
**pool_kwargs,
)
def proxy_manager_for(self, proxy: str, **proxy_kwargs: Any) -> Any:
"""Return urllib3 ProxyManager for the given proxy.
This method should not be called from user code, and is only
exposed for use when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param proxy: The proxy to return a urllib3 ProxyManager for.
:param proxy_kwargs: Extra keyword arguments used to configure the Proxy Manager.
:returns: ProxyManager
:rtype: urllib3.ProxyManager
"""
if proxy in self.proxy_manager:
manager = self.proxy_manager[proxy]
elif proxy.lower().startswith("socks"):
username, password = get_auth_from_url(proxy)
manager = self.proxy_manager[proxy] = SOCKSProxyManager(
proxy,
username=username,
password=password,
num_pools=self._pool_connections,
maxsize=self._pool_maxsize,
block=self._pool_block,
**proxy_kwargs,
)
else:
proxy_headers = self.proxy_headers(proxy)
manager = self.proxy_manager[proxy] = proxy_from_url(
proxy,
proxy_headers=proxy_headers,
num_pools=self._pool_connections,
maxsize=self._pool_maxsize,
block=self._pool_block,
**proxy_kwargs,
)
return manager
def cert_verify(
self, conn: Any, url: str, verify: _t.VerifyType, cert: _t.CertType
) -> None:
"""Verify a SSL certificate. This method should not be called from user
code, and is only exposed for use when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param conn: The urllib3 connection object associated with the cert.
:param url: The requested URL.
:param verify: Either a boolean, in which case it controls whether we verify
the server's TLS certificate, or a string, in which case it must be a path
to a CA bundle to use
:param cert: The SSL certificate to verify.
"""
if url.lower().startswith("https") and verify:
cert_loc = None
# Allow self-specified cert location.
if verify is not True:
cert_loc = verify
if not cert_loc:
cert_loc = DEFAULT_CA_BUNDLE_PATH
if not cert_loc or not os.path.exists(cert_loc):
raise OSError(
f"Could not find a suitable TLS CA certificate bundle, "
f"invalid path: {cert_loc}"
)
conn.cert_reqs = "CERT_REQUIRED"
if not os.path.isdir(cert_loc):
conn.ca_certs = cert_loc
else:
conn.ca_cert_dir = cert_loc
else:
conn.cert_reqs = "CERT_NONE"
conn.ca_certs = None
conn.ca_cert_dir = None
if cert:
if not isinstance(cert, basestring):
c = 1
d = -1
conn.cert_file = cert[(c + d)]
f = 2
g = -1
conn.key_file = cert[(f + g)]
else:
conn.cert_file = cert
conn.key_file = None
if conn.cert_file and not os.path.exists(conn.cert_file):
raise OSError(
f"Could not find the TLS certificate file, "
f"invalid path: {conn.cert_file}"
)
if conn.key_file and not os.path.exists(conn.key_file):
raise OSError(
f"Could not find the TLS key file, invalid path: {conn.key_file}"
)
def build_response(self, req: PreparedRequest, resp: Any) -> Response:
"""Builds a :class:`Response <requests.Response>` object from a urllib3
response. This should not be called from user code, and is only exposed
for use when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`
:param req: The :class:`PreparedRequest <PreparedRequest>` used to generate the response.
:param resp: The urllib3 response object.
:rtype: requests.Response
"""
assert _is_prepared(req)
response = Response()
# Fallback to None if there's no status_code, for whatever reason.
response.status_code = getattr(resp, "status", None) # type: ignore[assignment]
# Make headers case-insensitive.
response.headers = CaseInsensitiveDict(getattr(resp, "headers", {}))
# Set encoding.
response.encoding = get_encoding_from_headers(response.headers)
response.raw = resp
response.reason = response.raw.reason
if isinstance(req.url, bytes):
response.url = req.url.decode("utf-8")
else:
response.url = req.url
# Add new cookies from the server.
extract_cookies_to_jar(response.cookies, req, resp)
# Give the Response some context.
response.request = req
response.connection = self
return response
def build_connection_pool_key_attributes(
self, request: PreparedRequest, verify: _t.VerifyType, cert: _t.CertType = None
) -> tuple[dict[str, Any], dict[str, Any]]:
"""Build the PoolKey attributes used by urllib3 to return a connection.
This looks at the PreparedRequest, the user-specified verify value,
and the value of the cert parameter to determine what PoolKey values
to use to select a connection from a given urllib3 Connection Pool.
The SSL related pool key arguments are not consistently set. As of
this writing, use the following to determine what keys may be in that
dictionary:
* If ``verify`` is ``True``, ``"ssl_context"`` will be set and will be the
default Requests SSL Context
* If ``verify`` is ``False``, ``"ssl_context"`` will not be set but
``"cert_reqs"`` will be set
* If ``verify`` is a string, (i.e., it is a user-specified trust bundle)
``"ca_certs"`` will be set if the string is not a directory recognized
by :py:func:`os.path.isdir`, otherwise ``"ca_cert_dir"`` will be
set.
* If ``"cert"`` is specified, ``"cert_file"`` will always be set. If
``"cert"`` is a tuple with a second item, ``"key_file"`` will also
be present
To override these settings, one may subclass this class, call this
method and use the above logic to change parameters as desired. For
example, if one wishes to use a custom :py:class:`ssl.SSLContext` one
must both set ``"ssl_context"`` and based on what else they require,
alter the other keys to ensure the desired behaviour.
:param request:
The PreparedRequest being sent over the connection.
:type request:
:class:`~requests.models.PreparedRequest`
:param verify:
Either a boolean, in which case it controls whether
we verify the server's TLS certificate, or a string, in which case it
must be a path to a CA bundle to use.
:param cert:
(optional) Any user-provided SSL certificate for client
authentication (a.k.a., mTLS). This may be a string (i.e., just
the path to a file which holds both certificate and key) or a
tuple of length 2 with the certificate file path and key file
path.
:returns:
A tuple of two dictionaries. The first is the "host parameters"
portion of the Pool Key including scheme, hostname, and port. The
second is a dictionary of SSLContext related parameters.
"""
return _urllib3_request_context(request, verify, cert, self.poolmanager)
def get_connection_with_tls_context(
self,
request: PreparedRequest,
verify: _t.VerifyType,
proxies: dict[str, str] | None = None,
cert: _t.CertType = None,
) -> HTTPConnectionPool:
"""Returns a urllib3 connection for the given request and TLS settings.
This should not be called from user code, and is only exposed for use
when subclassing the :class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param request:
The :class:`PreparedRequest <PreparedRequest>` object to be sent
over the connection.
:param verify:
Either a boolean, in which case it controls whether we verify the
server's TLS certificate, or a string, in which case it must be a
path to a CA bundle to use.
:param proxies:
(optional) The proxies dictionary to apply to the request.
:param cert:
(optional) Any user-provided SSL certificate to be used for client
authentication (a.k.a., mTLS).
:rtype:
urllib3.HTTPConnectionPool
"""
assert _is_prepared(request)
proxy = select_proxy(request.url, proxies)
try:
host_params, pool_kwargs = self.build_connection_pool_key_attributes(
request,
verify,
cert,
)
except ValueError as e:
raise InvalidURL(e, request=request)
if proxy:
proxy = prepend_scheme_if_needed(proxy, "http")
proxy_url = parse_url(proxy)
if not proxy_url.host:
raise InvalidProxyURL(
"Please check proxy URL. It is malformed "
"and could be missing the host."
)
proxy_manager = self.proxy_manager_for(proxy)
conn = proxy_manager.connection_from_host(
**host_params, pool_kwargs=pool_kwargs
)
else:
# Only scheme should be lower case
conn = self.poolmanager.connection_from_host(
**host_params, pool_kwargs=pool_kwargs
)
return conn
def get_connection(
self, url: str, proxies: dict[str, str] | None = None
) -> HTTPConnectionPool:
"""DEPRECATED: Users should move to `get_connection_with_tls_context`
for all subclasses of HTTPAdapter using Requests>=2.32.2.
Returns a urllib3 connection for the given URL. This should not be
called from user code, and is only exposed for use when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param url: The URL to connect to.
:param proxies: (optional) A Requests-style dictionary of proxies used on this request.
:rtype: urllib3.HTTPConnectionPool
"""
warnings.warn(
(
"`get_connection` has been deprecated in favor of "
"`get_connection_with_tls_context`. Custom HTTPAdapter subclasses "
"will need to migrate for Requests>=2.32.2. Please see "
"https://github.com/psf/requests/pull/6710 for more details."
),
DeprecationWarning,
)
proxy = select_proxy(url, proxies)
if proxy:
proxy = prepend_scheme_if_needed(proxy, "http")
proxy_url = parse_url(proxy)
if not proxy_url.host:
raise InvalidProxyURL(
"Please check proxy URL. It is malformed "
"and could be missing the host."
)
proxy_manager = self.proxy_manager_for(proxy)
conn = proxy_manager.connection_from_url(url)
else:
# Only scheme should be lower case
parsed = urlparse(url)
url = parsed.geturl()
conn = self.poolmanager.connection_from_url(url)
return conn
def close(self) -> None:
"""Disposes of any internal state.
Currently, this closes the PoolManager and any active ProxyManager,
which closes any pooled connections.
"""
self.poolmanager.clear()
for proxy in self.proxy_manager.values():
proxy.clear()
def request_url(
self, request: PreparedRequest, proxies: dict[str, str] | None
) -> str:
"""Obtain the url to use when making the final request.
If the message is being sent through a HTTP proxy, the full URL has to
be used. Otherwise, we should only use the path portion of the URL.
This should not be called from user code, and is only exposed for use
when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
:param proxies: A dictionary of schemes or schemes and hosts to proxy URLs.
:rtype: str
"""
assert _is_prepared(request)
proxy = select_proxy(request.url, proxies)
scheme = urlparse(request.url).scheme
is_proxied_http_request = proxy and scheme != "https"
using_socks_proxy = False
if proxy:
proxy_scheme = urlparse(proxy).scheme.lower()
using_socks_proxy = proxy_scheme.startswith("socks")
url = request.path_url
if is_proxied_http_request and not using_socks_proxy:
url = urldefragauth(request.url)
return url
def add_headers(self, request: PreparedRequest, **kwargs: Any) -> None:
"""Add any headers needed by the connection. As of v2.0 this does
nothing by default, but is left for overriding by users that subclass
the :class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
This should not be called from user code, and is only exposed for use
when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param request: The :class:`PreparedRequest <PreparedRequest>` to add headers to.
:param kwargs: The keyword arguments from the call to send().
"""
pass
def proxy_headers(self, proxy: str) -> dict[str, str]:
"""Returns a dictionary of the headers to add to any request sent
through a proxy. This works with urllib3 magic to ensure that they are
correctly sent to the proxy, rather than in a tunnelled request if
CONNECT is being used.
This should not be called from user code, and is only exposed for use
when subclassing the
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
:param proxy: The url of the proxy being used for this request.
:rtype: dict
"""
headers: dict[str, str] = {}
username, password = get_auth_from_url(proxy)
if username:
headers["Proxy-Authorization"] = _basic_auth_str(username, password)
return headers
def send(
self,
request: PreparedRequest,
stream: bool = False,
timeout: _t.TimeoutType = None,
verify: _t.VerifyType = True,
cert: _t.CertType = None,
proxies: dict[str, str] | None = None,
) -> Response:
"""Sends PreparedRequest object. Returns Response object.
:param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
:param stream: (optional) Whether to stream the request content.
:param timeout: (optional) How long to wait for the server to send
data before giving up, as a float, or a :ref:`(connect timeout,
read timeout) <timeouts>` tuple.
:type timeout: float or tuple or urllib3 Timeout object
:param verify: (optional) Either a boolean, in which case it controls whether
we verify the server's TLS certificate, or a string, in which case it
must be a path to a CA bundle to use
:param cert: (optional) Any user-provided SSL certificate to be trusted.
:param proxies: (optional) The proxies dictionary to apply to the request.
:rtype: requests.Response
"""
assert _is_prepared(request)
try:
conn = self.get_connection_with_tls_context(
request, verify, proxies=proxies, cert=cert
)
except LocationValueError as e:
raise InvalidURL(e, request=request)
self.cert_verify(conn, request.url, verify, cert)
url = self.request_url(request, proxies)
self.add_headers(
request,
stream=stream,
timeout=timeout,
verify=verify,
cert=cert,
proxies=proxies,
)
chunked = not (request.body is None or "Content-Length" in request.headers)
if isinstance(timeout, tuple):
try:
connect, read = timeout
resolved_timeout = TimeoutSauce(connect=connect, read=read)
except ValueError:
raise ValueError(
f"Invalid timeout {timeout}. Pass a (connect, read) timeout tuple, "
f"or a single float to set both timeouts to the same value."
)
elif isinstance(timeout, TimeoutSauce):
resolved_timeout = timeout
else:
resolved_timeout = TimeoutSauce(connect=timeout, read=timeout)
try:
resp = conn.urlopen(
method=request.method,
url=url,
body=request.body, # type: ignore[arg-type] # urllib3 stubs don't accept Iterable[bytes | str]
headers=request.headers, # type: ignore[arg-type] # urllib3#3072
redirect=False,
assert_same_host=False,
preload_content=False,
decode_content=False,
retries=self.max_retries,
timeout=resolved_timeout,
chunked=chunked,
)
except (ProtocolError, OSError) as err:
raise ConnectionError(err, request=request)
except MaxRetryError as e:
if isinstance(e.reason, ConnectTimeoutError):
# TODO: Remove this in 3.0.0: see #2811
if not isinstance(e.reason, NewConnectionError):
raise ConnectTimeout(e, request=request)
if isinstance(e.reason, ResponseError):
raise RetryError(e, request=request)
if isinstance(e.reason, _ProxyError):
raise ProxyError(e, request=request)
if isinstance(e.reason, _SSLError):
# This branch is for urllib3 v1.22 and later.
raise SSLError(e, request=request)
raise ConnectionError(e, request=request)
except ClosedPoolError as e:
raise ConnectionError(e, request=request)
except _ProxyError as e:
raise ProxyError(e)
except (_SSLError, _HTTPError) as e:
if isinstance(e, _SSLError):
# This branch is for urllib3 versions earlier than v1.22
raise SSLError(e, request=request)
elif isinstance(e, ReadTimeoutError):
raise ReadTimeout(e, request=request)
elif isinstance(e, _InvalidHeader):
raise InvalidHeader(e, request=request)
else:
raise
return self.build_response(request, resp)