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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fusr%2F'>usr</a>/<a href='?path=%2Fusr%2Flib%2F'>lib</a>/<a href='?path=%2Fusr%2Flib%2Fpython3.6%2F'>python3.6</a>/<a href='?path=%2Fusr%2Flib%2Fpython3.6%2Fsite-packages%2F'>site-packages</a>/<a href='?path=%2Fusr%2Flib%2Fpython3.6%2Fsite-packages%2Frequests%2F'>requests</a>/</p><hr><h3>✏️ Editing: sessions.py</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'># -*- coding: utf-8 -*-

&quot;&quot;&quot;
requests.session
~~~~~~~~~~~~~~~~

This module provides a Session object to manage and persist settings across
requests (cookies, auth, proxies).
&quot;&quot;&quot;
import os
import sys
import time
from datetime import timedelta

from .auth import _basic_auth_str
from .compat import cookielib, is_py3, OrderedDict, urljoin, urlparse, Mapping
from .cookies import (
    cookiejar_from_dict, extract_cookies_to_jar, RequestsCookieJar, merge_cookies)
from .models import Request, PreparedRequest, DEFAULT_REDIRECT_LIMIT
from .hooks import default_hooks, dispatch_hook
from ._internal_utils import to_native_string
from .utils import to_key_val_list, default_headers, DEFAULT_PORTS
from .exceptions import (
    TooManyRedirects, InvalidSchema, ChunkedEncodingError, ContentDecodingError)

from .structures import CaseInsensitiveDict
from .adapters import HTTPAdapter

from .utils import (
    requote_uri, get_environ_proxies, get_netrc_auth, should_bypass_proxies,
    get_auth_from_url, rewind_body
)

from .status_codes import codes

# formerly defined here, reexposed here for backward compatibility
from .models import REDIRECT_STATI

# Preferred clock, based on which one is more accurate on a given system.
if sys.platform == 'win32':
    try:  # Python 3.4+
        preferred_clock = time.perf_counter
    except AttributeError:  # Earlier than Python 3.
        preferred_clock = time.clock
else:
    preferred_clock = time.time


def merge_setting(request_setting, session_setting, dict_class=OrderedDict):
    &quot;&quot;&quot;Determines appropriate setting for a given request, taking into account
    the explicit setting on that request, and the setting in the session. If a
    setting is a dictionary, they will be merged together using `dict_class`
    &quot;&quot;&quot;

    if session_setting is None:
        return request_setting

    if request_setting is None:
        return session_setting

    # Bypass if not a dictionary (e.g. verify)
    if not (
            isinstance(session_setting, Mapping) and
            isinstance(request_setting, Mapping)
    ):
        return request_setting

    merged_setting = dict_class(to_key_val_list(session_setting))
    merged_setting.update(to_key_val_list(request_setting))

    # Remove keys that are set to None. Extract keys first to avoid altering
    # the dictionary during iteration.
    none_keys = [k for (k, v) in merged_setting.items() if v is None]
    for key in none_keys:
        del merged_setting[key]

    return merged_setting


def merge_hooks(request_hooks, session_hooks, dict_class=OrderedDict):
    &quot;&quot;&quot;Properly merges both requests and session hooks.

    This is necessary because when request_hooks == {'response': []}, the
    merge breaks Session hooks entirely.
    &quot;&quot;&quot;
    if session_hooks is None or session_hooks.get('response') == []:
        return request_hooks

    if request_hooks is None or request_hooks.get('response') == []:
        return session_hooks

    return merge_setting(request_hooks, session_hooks, dict_class)


class SessionRedirectMixin(object):

    def get_redirect_target(self, resp):
        &quot;&quot;&quot;Receives a Response. Returns a redirect URI or ``None``&quot;&quot;&quot;
        # Due to the nature of how requests processes redirects this method will
        # be called at least once upon the original response and at least twice
        # on each subsequent redirect response (if any).
        # If a custom mixin is used to handle this logic, it may be advantageous
        # to cache the redirect location onto the response object as a private
        # attribute.
        if resp.is_redirect:
            location = resp.headers['location']
            # Currently the underlying http module on py3 decode headers
            # in latin1, but empirical evidence suggests that latin1 is very
            # rarely used with non-ASCII characters in HTTP headers.
            # It is more likely to get UTF8 header rather than latin1.
            # This causes incorrect handling of UTF8 encoded location headers.
            # To solve this, we re-encode the location in latin1.
            if is_py3:
                location = location.encode('latin1')
            return to_native_string(location, 'utf8')
        return None

    def should_strip_auth(self, old_url, new_url):
        &quot;&quot;&quot;Decide whether Authorization header should be removed when redirecting&quot;&quot;&quot;
        old_parsed = urlparse(old_url)
        new_parsed = urlparse(new_url)
        if old_parsed.hostname != new_parsed.hostname:
            return True
        # Special case: allow http -&gt; https redirect when using the standard
        # ports. This isn't specified by RFC 7235, but is kept to avoid
        # breaking backwards compatibility with older versions of requests
        # that allowed any redirects on the same host.
        if (old_parsed.scheme == 'http' and old_parsed.port in (80, None)
                and new_parsed.scheme == 'https' and new_parsed.port in (443, None)):
            return False

        # Handle default port usage corresponding to scheme.
        changed_port = old_parsed.port != new_parsed.port
        changed_scheme = old_parsed.scheme != new_parsed.scheme
        default_port = (DEFAULT_PORTS.get(old_parsed.scheme, None), None)
        if (not changed_scheme and old_parsed.port in default_port
                and new_parsed.port in default_port):
            return False

        # Standard case: root URI must match
        return changed_port or changed_scheme

    def resolve_redirects(self, resp, req, stream=False, timeout=None,
                          verify=True, cert=None, proxies=None, yield_requests=False, **adapter_kwargs):
        &quot;&quot;&quot;Receives a Response. Returns a generator of Responses or Requests.&quot;&quot;&quot;

        hist = []  # keep track of history

        url = self.get_redirect_target(resp)
        previous_fragment = urlparse(req.url).fragment
        while url:
            prepared_request = req.copy()

            # Update history and keep track of redirects.
            # resp.history must ignore the original request in this loop
            hist.append(resp)
            resp.history = hist[1:]

            try:
                resp.content  # Consume socket so it can be released
            except (ChunkedEncodingError, ContentDecodingError, RuntimeError):
                resp.raw.read(decode_content=False)

            if len(resp.history) &gt;= self.max_redirects:
                raise TooManyRedirects('Exceeded %s redirects.' % self.max_redirects, response=resp)

            # Release the connection back into the pool.
            resp.close()

            # Handle redirection without scheme (see: RFC 1808 Section 4)
            if url.startswith('//'):
                parsed_rurl = urlparse(resp.url)
                url = '%s:%s' % (to_native_string(parsed_rurl.scheme), url)

            # Normalize url case and attach previous fragment if needed (RFC 7231 7.1.2)
            parsed = urlparse(url)
            if parsed.fragment == '' and previous_fragment:
                parsed = parsed._replace(fragment=previous_fragment)
            elif parsed.fragment:
                previous_fragment = parsed.fragment
            url = parsed.geturl()

            # Facilitate relative 'location' headers, as allowed by RFC 7231.
            # (e.g. '/path/to/resource' instead of 'http://domain.tld/path/to/resource')
            # Compliant with RFC3986, we percent encode the url.
            if not parsed.netloc:
                url = urljoin(resp.url, requote_uri(url))
            else:
                url = requote_uri(url)

            prepared_request.url = to_native_string(url)

            self.rebuild_method(prepared_request, resp)

            # https://github.com/requests/requests/issues/1084
            if resp.status_code not in (codes.temporary_redirect, codes.permanent_redirect):
                # https://github.com/requests/requests/issues/3490
                purged_headers = ('Content-Length', 'Content-Type', 'Transfer-Encoding')
                for header in purged_headers:
                    prepared_request.headers.pop(header, None)
                prepared_request.body = None

            headers = prepared_request.headers
            try:
                del headers['Cookie']
            except KeyError:
                pass

            # Extract any cookies sent on the response to the cookiejar
            # in the new request. Because we've mutated our copied prepared
            # request, use the old one that we haven't yet touched.
            extract_cookies_to_jar(prepared_request._cookies, req, resp.raw)
            merge_cookies(prepared_request._cookies, self.cookies)
            prepared_request.prepare_cookies(prepared_request._cookies)

            # Rebuild auth and proxy information.
            proxies = self.rebuild_proxies(prepared_request, proxies)
            self.rebuild_auth(prepared_request, resp)

            # A failed tell() sets `_body_position` to `object()`. This non-None
            # value ensures `rewindable` will be True, allowing us to raise an
            # UnrewindableBodyError, instead of hanging the connection.
            rewindable = (
                prepared_request._body_position is not None and
                ('Content-Length' in headers or 'Transfer-Encoding' in headers)
            )

            # Attempt to rewind consumed file-like object.
            if rewindable:
                rewind_body(prepared_request)

            # Override the original request.
            req = prepared_request

            if yield_requests:
                yield req
            else:

                resp = self.send(
                    req,
                    stream=stream,
                    timeout=timeout,
                    verify=verify,
                    cert=cert,
                    proxies=proxies,
                    allow_redirects=False,
                    **adapter_kwargs
                )

                extract_cookies_to_jar(self.cookies, prepared_request, resp.raw)

                # extract redirect url, if any, for the next loop
                url = self.get_redirect_target(resp)
                yield resp

    def rebuild_auth(self, prepared_request, response):
        &quot;&quot;&quot;When being redirected we may want to strip authentication from the
        request to avoid leaking credentials. This method intelligently removes
        and reapplies authentication where possible to avoid credential loss.
        &quot;&quot;&quot;
        headers = prepared_request.headers
        url = prepared_request.url

        if 'Authorization' in headers and self.should_strip_auth(response.request.url, url):
            # If we get redirected to a new host, we should strip out any
            # authentication headers.
            del headers['Authorization']

        # .netrc might have more auth for us on our new host.
        new_auth = get_netrc_auth(url) if self.trust_env else None
        if new_auth is not None:
            prepared_request.prepare_auth(new_auth)

        return

    def rebuild_proxies(self, prepared_request, proxies):
        &quot;&quot;&quot;This method re-evaluates the proxy configuration by considering the
        environment variables. If we are redirected to a URL covered by
        NO_PROXY, we strip the proxy configuration. Otherwise, we set missing
        proxy keys for this URL (in case they were stripped by a previous
        redirect).

        This method also replaces the Proxy-Authorization header where
        necessary.

        :rtype: dict
        &quot;&quot;&quot;
        proxies = proxies if proxies is not None else {}
        headers = prepared_request.headers
        url = prepared_request.url
        scheme = urlparse(url).scheme
        new_proxies = proxies.copy()
        no_proxy = proxies.get('no_proxy')

        bypass_proxy = should_bypass_proxies(url, no_proxy=no_proxy)
        if self.trust_env and not bypass_proxy:
            environ_proxies = get_environ_proxies(url, no_proxy=no_proxy)

            proxy = environ_proxies.get(scheme, environ_proxies.get('all'))

            if proxy:
                new_proxies.setdefault(scheme, proxy)

        if 'Proxy-Authorization' in headers:
            del headers['Proxy-Authorization']

        try:
            username, password = get_auth_from_url(new_proxies[scheme])
        except KeyError:
            username, password = None, None

        # urllib3 handles proxy authorization for us in the standard adapter.
        # Avoid appending this to TLS tunneled requests where it may be leaked.
        if not scheme.startswith('https') and username and password:
            headers['Proxy-Authorization'] = _basic_auth_str(username, password)

        return new_proxies

    def rebuild_method(self, prepared_request, response):
        &quot;&quot;&quot;When being redirected we may want to change the method of the request
        based on certain specs or browser behavior.
        &quot;&quot;&quot;
        method = prepared_request.method

        # https://tools.ietf.org/html/rfc7231#section-6.4.4
        if response.status_code == codes.see_other and method != 'HEAD':
            method = 'GET'

        # Do what the browsers do, despite standards...
        # First, turn 302s into GETs.
        if response.status_code == codes.found and method != 'HEAD':
            method = 'GET'

        # Second, if a POST is responded to with a 301, turn it into a GET.
        # This bizarre behaviour is explained in Issue 1704.
        if response.status_code == codes.moved and method == 'POST':
            method = 'GET'

        prepared_request.method = method


class Session(SessionRedirectMixin):
    &quot;&quot;&quot;A Requests session.

    Provides cookie persistence, connection-pooling, and configuration.

    Basic Usage::

      &gt;&gt;&gt; import requests
      &gt;&gt;&gt; s = requests.Session()
      &gt;&gt;&gt; s.get('https://httpbin.org/get')
      &lt;Response [200]&gt;

    Or as a context manager::

      &gt;&gt;&gt; with requests.Session() as s:
      &gt;&gt;&gt;     s.get('https://httpbin.org/get')
      &lt;Response [200]&gt;
    &quot;&quot;&quot;

    __attrs__ = [
        'headers', 'cookies', 'auth', 'proxies', 'hooks', 'params', 'verify',
        'cert', 'prefetch', 'adapters', 'stream', 'trust_env',
        'max_redirects',
    ]

    def __init__(self):

        #: A case-insensitive dictionary of headers to be sent on each
        #: :class:`Request &lt;Request&gt;` sent from this
        #: :class:`Session &lt;Session&gt;`.
        self.headers = default_headers()

        #: Default Authentication tuple or object to attach to
        #: :class:`Request &lt;Request&gt;`.
        self.auth = None

        #: Dictionary mapping protocol or protocol and host to the URL of the proxy
        #: (e.g. {'http': 'foo.bar:3128', 'http://host.name': 'foo.bar:4012'}) to
        #: be used on each :class:`Request &lt;Request&gt;`.
        self.proxies = {}

        #: Event-handling hooks.
        self.hooks = default_hooks()

        #: Dictionary of querystring data to attach to each
        #: :class:`Request &lt;Request&gt;`. The dictionary values may be lists for
        #: representing multivalued query parameters.
        self.params = {}

        #: Stream response content default.
        self.stream = False

        #: SSL Verification default.
        self.verify = True

        #: SSL client certificate default, if String, path to ssl client
        #: cert file (.pem). If Tuple, ('cert', 'key') pair.
        self.cert = None

        #: Maximum number of redirects allowed. If the request exceeds this
        #: limit, a :class:`TooManyRedirects` exception is raised.
        #: This defaults to requests.models.DEFAULT_REDIRECT_LIMIT, which is
        #: 30.
        self.max_redirects = DEFAULT_REDIRECT_LIMIT

        #: Trust environment settings for proxy configuration, default
        #: authentication and similar.
        self.trust_env = True

        #: A CookieJar containing all currently outstanding cookies set on this
        #: session. By default it is a
        #: :class:`RequestsCookieJar &lt;requests.cookies.RequestsCookieJar&gt;`, but
        #: may be any other ``cookielib.CookieJar`` compatible object.
        self.cookies = cookiejar_from_dict({})

        # Default connection adapters.
        self.adapters = OrderedDict()
        self.mount('https://', HTTPAdapter())
        self.mount('http://', HTTPAdapter())

    def __enter__(self):
        return self

    def __exit__(self, *args):
        self.close()

    def prepare_request(self, request):
        &quot;&quot;&quot;Constructs a :class:`PreparedRequest &lt;PreparedRequest&gt;` for
        transmission and returns it. The :class:`PreparedRequest` has settings
        merged from the :class:`Request &lt;Request&gt;` instance and those of the
        :class:`Session`.

        :param request: :class:`Request` instance to prepare with this
            session's settings.
        :rtype: requests.PreparedRequest
        &quot;&quot;&quot;
        cookies = request.cookies or {}

        # Bootstrap CookieJar.
        if not isinstance(cookies, cookielib.CookieJar):
            cookies = cookiejar_from_dict(cookies)

        # Merge with session cookies
        merged_cookies = merge_cookies(
            merge_cookies(RequestsCookieJar(), self.cookies), cookies)

        # Set environment's basic authentication if not explicitly set.
        auth = request.auth
        if self.trust_env and not auth and not self.auth:
            auth = get_netrc_auth(request.url)

        p = PreparedRequest()
        p.prepare(
            method=request.method.upper(),
            url=request.url,
            files=request.files,
            data=request.data,
            json=request.json,
            headers=merge_setting(request.headers, self.headers, dict_class=CaseInsensitiveDict),
            params=merge_setting(request.params, self.params),
            auth=merge_setting(auth, self.auth),
            cookies=merged_cookies,
            hooks=merge_hooks(request.hooks, self.hooks),
        )
        return p

    def request(self, method, url,
            params=None, data=None, headers=None, cookies=None, files=None,
            auth=None, timeout=None, allow_redirects=True, proxies=None,
            hooks=None, stream=None, verify=None, cert=None, json=None):
        &quot;&quot;&quot;Constructs a :class:`Request &lt;Request&gt;`, prepares it and sends it.
        Returns :class:`Response &lt;Response&gt;` object.

        :param method: method for the new :class:`Request` object.
        :param url: URL for the new :class:`Request` object.
        :param params: (optional) Dictionary or bytes to be sent in the query
            string for the :class:`Request`.
        :param data: (optional) Dictionary, list of tuples, bytes, or file-like
            object to send in the body of the :class:`Request`.
        :param json: (optional) json to send in the body of the
            :class:`Request`.
        :param headers: (optional) Dictionary of HTTP Headers to send with the
            :class:`Request`.
        :param cookies: (optional) Dict or CookieJar object to send with the
            :class:`Request`.
        :param files: (optional) Dictionary of ``'filename': file-like-objects``
            for multipart encoding upload.
        :param auth: (optional) Auth tuple or callable to enable
            Basic/Digest/Custom HTTP Auth.
        :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) &lt;timeouts&gt;` tuple.
        :type timeout: float or tuple
        :param allow_redirects: (optional) Set to True by default.
        :type allow_redirects: bool
        :param proxies: (optional) Dictionary mapping protocol or protocol and
            hostname to the URL of the proxy.
        :param stream: (optional) whether to immediately download the response
            content. Defaults to ``False``.
        :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. Defaults to ``True``.
        :param cert: (optional) if String, path to ssl client cert file (.pem).
            If Tuple, ('cert', 'key') pair.
        :rtype: requests.Response
        &quot;&quot;&quot;
        # Create the Request.
        req = Request(
            method=method.upper(),
            url=url,
            headers=headers,
            files=files,
            data=data or {},
            json=json,
            params=params or {},
            auth=auth,
            cookies=cookies,
            hooks=hooks,
        )
        prep = self.prepare_request(req)

        proxies = proxies or {}

        settings = self.merge_environment_settings(
            prep.url, proxies, stream, verify, cert
        )

        # Send the request.
        send_kwargs = {
            'timeout': timeout,
            'allow_redirects': allow_redirects,
        }
        send_kwargs.update(settings)
        resp = self.send(prep, **send_kwargs)

        return resp

    def get(self, url, **kwargs):
        r&quot;&quot;&quot;Sends a GET request. Returns :class:`Response` object.

        :param url: URL for the new :class:`Request` object.
        :param \*\*kwargs: Optional arguments that ``request`` takes.
        :rtype: requests.Response
        &quot;&quot;&quot;

        kwargs.setdefault('allow_redirects', True)
        return self.request('GET', url, **kwargs)

    def options(self, url, **kwargs):
        r&quot;&quot;&quot;Sends a OPTIONS request. Returns :class:`Response` object.

        :param url: URL for the new :class:`Request` object.
        :param \*\*kwargs: Optional arguments that ``request`` takes.
        :rtype: requests.Response
        &quot;&quot;&quot;

        kwargs.setdefault('allow_redirects', True)
        return self.request('OPTIONS', url, **kwargs)

    def head(self, url, **kwargs):
        r&quot;&quot;&quot;Sends a HEAD request. Returns :class:`Response` object.

        :param url: URL for the new :class:`Request` object.
        :param \*\*kwargs: Optional arguments that ``request`` takes.
        :rtype: requests.Response
        &quot;&quot;&quot;

        kwargs.setdefault('allow_redirects', False)
        return self.request('HEAD', url, **kwargs)

    def post(self, url, data=None, json=None, **kwargs):
        r&quot;&quot;&quot;Sends a POST request. Returns :class:`Response` object.

        :param url: URL for the new :class:`Request` object.
        :param data: (optional) Dictionary, list of tuples, bytes, or file-like
            object to send in the body of the :class:`Request`.
        :param json: (optional) json to send in the body of the :class:`Request`.
        :param \*\*kwargs: Optional arguments that ``request`` takes.
        :rtype: requests.Response
        &quot;&quot;&quot;

        return self.request('POST', url, data=data, json=json, **kwargs)

    def put(self, url, data=None, **kwargs):
        r&quot;&quot;&quot;Sends a PUT request. Returns :class:`Response` object.

        :param url: URL for the new :class:`Request` object.
        :param data: (optional) Dictionary, list of tuples, bytes, or file-like
            object to send in the body of the :class:`Request`.
        :param \*\*kwargs: Optional arguments that ``request`` takes.
        :rtype: requests.Response
        &quot;&quot;&quot;

        return self.request('PUT', url, data=data, **kwargs)

    def patch(self, url, data=None, **kwargs):
        r&quot;&quot;&quot;Sends a PATCH request. Returns :class:`Response` object.

        :param url: URL for the new :class:`Request` object.
        :param data: (optional) Dictionary, list of tuples, bytes, or file-like
            object to send in the body of the :class:`Request`.
        :param \*\*kwargs: Optional arguments that ``request`` takes.
        :rtype: requests.Response
        &quot;&quot;&quot;

        return self.request('PATCH', url, data=data, **kwargs)

    def delete(self, url, **kwargs):
        r&quot;&quot;&quot;Sends a DELETE request. Returns :class:`Response` object.

        :param url: URL for the new :class:`Request` object.
        :param \*\*kwargs: Optional arguments that ``request`` takes.
        :rtype: requests.Response
        &quot;&quot;&quot;

        return self.request('DELETE', url, **kwargs)

    def send(self, request, **kwargs):
        &quot;&quot;&quot;Send a given PreparedRequest.

        :rtype: requests.Response
        &quot;&quot;&quot;
        # Set defaults that the hooks can utilize to ensure they always have
        # the correct parameters to reproduce the previous request.
        kwargs.setdefault('stream', self.stream)
        kwargs.setdefault('verify', self.verify)
        kwargs.setdefault('cert', self.cert)
        kwargs.setdefault('proxies', self.proxies)

        # It's possible that users might accidentally send a Request object.
        # Guard against that specific failure case.
        if isinstance(request, Request):
            raise ValueError('You can only send PreparedRequests.')

        # Set up variables needed for resolve_redirects and dispatching of hooks
        allow_redirects = kwargs.pop('allow_redirects', True)
        stream = kwargs.get('stream')
        hooks = request.hooks

        # Get the appropriate adapter to use
        adapter = self.get_adapter(url=request.url)

        # Start time (approximately) of the request
        start = preferred_clock()

        # Send the request
        r = adapter.send(request, **kwargs)

        # Total elapsed time of the request (approximately)
        elapsed = preferred_clock() - start
        r.elapsed = timedelta(seconds=elapsed)

        # Response manipulation hooks
        r = dispatch_hook('response', hooks, r, **kwargs)

        # Persist cookies
        if r.history:

            # If the hooks create history then we want those cookies too
            for resp in r.history:
                extract_cookies_to_jar(self.cookies, resp.request, resp.raw)

        extract_cookies_to_jar(self.cookies, request, r.raw)

        # Redirect resolving generator.
        gen = self.resolve_redirects(r, request, **kwargs)

        # Resolve redirects if allowed.
        history = [resp for resp in gen] if allow_redirects else []

        # Shuffle things around if there's history.
        if history:
            # Insert the first (original) request at the start
            history.insert(0, r)
            # Get the last request made
            r = history.pop()
            r.history = history

        # If redirects aren't being followed, store the response on the Request for Response.next().
        if not allow_redirects:
            try:
                r._next = next(self.resolve_redirects(r, request, yield_requests=True, **kwargs))
            except StopIteration:
                pass

        if not stream:
            r.content

        return r

    def merge_environment_settings(self, url, proxies, stream, verify, cert):
        &quot;&quot;&quot;
        Check the environment and merge it with some settings.

        :rtype: dict
        &quot;&quot;&quot;
        # Gather clues from the surrounding environment.
        if self.trust_env:
            # Set environment's proxies.
            no_proxy = proxies.get('no_proxy') if proxies is not None else None
            env_proxies = get_environ_proxies(url, no_proxy=no_proxy)
            for (k, v) in env_proxies.items():
                proxies.setdefault(k, v)

            # Look for requests environment configuration and be compatible
            # with cURL.
            if verify is True or verify is None:
                verify = (os.environ.get('REQUESTS_CA_BUNDLE') or
                          os.environ.get('CURL_CA_BUNDLE'))

        # Merge all the kwargs.
        proxies = merge_setting(proxies, self.proxies)
        stream = merge_setting(stream, self.stream)
        verify = merge_setting(verify, self.verify)
        cert = merge_setting(cert, self.cert)

        return {'verify': verify, 'proxies': proxies, 'stream': stream,
                'cert': cert}

    def get_adapter(self, url):
        &quot;&quot;&quot;
        Returns the appropriate connection adapter for the given URL.

        :rtype: requests.adapters.BaseAdapter
        &quot;&quot;&quot;
        for (prefix, adapter) in self.adapters.items():

            if url.lower().startswith(prefix.lower()):
                return adapter

        # Nothing matches :-/
        raise InvalidSchema(&quot;No connection adapters were found for '%s'&quot; % url)

    def close(self):
        &quot;&quot;&quot;Closes all adapters and as such the session&quot;&quot;&quot;
        for v in self.adapters.values():
            v.close()

    def mount(self, prefix, adapter):
        &quot;&quot;&quot;Registers a connection adapter to a prefix.

        Adapters are sorted in descending order by prefix length.
        &quot;&quot;&quot;
        self.adapters[prefix] = adapter
        keys_to_move = [k for k in self.adapters if len(k) &lt; len(prefix)]

        for key in keys_to_move:
            self.adapters[key] = self.adapters.pop(key)

    def __getstate__(self):
        state = {attr: getattr(self, attr, None) for attr in self.__attrs__}
        return state

    def __setstate__(self, state):
        for attr, value in state.items():
            setattr(self, attr, value)


def session():
    &quot;&quot;&quot;
    Returns a :class:`Session` for context-management.

    .. deprecated:: 1.0.0

        This method has been deprecated since version 1.0.0 and is only kept for
        backwards compatibility. New code should use :class:`~requests.sessions.Session`
        to create a session. This may be removed at a future date.

    :rtype: Session
    &quot;&quot;&quot;
    return Session()
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