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annotate lib/python3.8/site-packages/pip/_vendor/urllib3/poolmanager.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 from __future__ import absolute_import
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2 import collections
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3 import functools
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4 import logging
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5
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6 from ._collections import RecentlyUsedContainer
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7 from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool
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8 from .connectionpool import port_by_scheme
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9 from .exceptions import LocationValueError, MaxRetryError, ProxySchemeUnknown
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10 from .packages import six
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11 from .packages.six.moves.urllib.parse import urljoin
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12 from .request import RequestMethods
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13 from .util.url import parse_url
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14 from .util.retry import Retry
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16
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17 __all__ = ["PoolManager", "ProxyManager", "proxy_from_url"]
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18
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19
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20 log = logging.getLogger(__name__)
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21
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22 SSL_KEYWORDS = (
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23 "key_file",
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24 "cert_file",
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25 "cert_reqs",
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26 "ca_certs",
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27 "ssl_version",
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28 "ca_cert_dir",
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29 "ssl_context",
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30 "key_password",
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31 )
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32
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33 # All known keyword arguments that could be provided to the pool manager, its
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34 # pools, or the underlying connections. This is used to construct a pool key.
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35 _key_fields = (
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36 "key_scheme", # str
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37 "key_host", # str
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38 "key_port", # int
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39 "key_timeout", # int or float or Timeout
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40 "key_retries", # int or Retry
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41 "key_strict", # bool
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42 "key_block", # bool
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43 "key_source_address", # str
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44 "key_key_file", # str
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45 "key_key_password", # str
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46 "key_cert_file", # str
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47 "key_cert_reqs", # str
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48 "key_ca_certs", # str
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49 "key_ssl_version", # str
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50 "key_ca_cert_dir", # str
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51 "key_ssl_context", # instance of ssl.SSLContext or urllib3.util.ssl_.SSLContext
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52 "key_maxsize", # int
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53 "key_headers", # dict
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54 "key__proxy", # parsed proxy url
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55 "key__proxy_headers", # dict
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56 "key_socket_options", # list of (level (int), optname (int), value (int or str)) tuples
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57 "key__socks_options", # dict
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58 "key_assert_hostname", # bool or string
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59 "key_assert_fingerprint", # str
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60 "key_server_hostname", # str
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61 )
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62
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63 #: The namedtuple class used to construct keys for the connection pool.
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64 #: All custom key schemes should include the fields in this key at a minimum.
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65 PoolKey = collections.namedtuple("PoolKey", _key_fields)
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66
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67
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68 def _default_key_normalizer(key_class, request_context):
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69 """
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70 Create a pool key out of a request context dictionary.
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71
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72 According to RFC 3986, both the scheme and host are case-insensitive.
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73 Therefore, this function normalizes both before constructing the pool
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74 key for an HTTPS request. If you wish to change this behaviour, provide
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75 alternate callables to ``key_fn_by_scheme``.
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76
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77 :param key_class:
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78 The class to use when constructing the key. This should be a namedtuple
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79 with the ``scheme`` and ``host`` keys at a minimum.
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80 :type key_class: namedtuple
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81 :param request_context:
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82 A dictionary-like object that contain the context for a request.
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83 :type request_context: dict
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84
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85 :return: A namedtuple that can be used as a connection pool key.
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86 :rtype: PoolKey
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87 """
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88 # Since we mutate the dictionary, make a copy first
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89 context = request_context.copy()
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90 context["scheme"] = context["scheme"].lower()
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91 context["host"] = context["host"].lower()
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92
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93 # These are both dictionaries and need to be transformed into frozensets
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94 for key in ("headers", "_proxy_headers", "_socks_options"):
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95 if key in context and context[key] is not None:
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96 context[key] = frozenset(context[key].items())
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97
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98 # The socket_options key may be a list and needs to be transformed into a
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99 # tuple.
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100 socket_opts = context.get("socket_options")
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101 if socket_opts is not None:
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102 context["socket_options"] = tuple(socket_opts)
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103
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104 # Map the kwargs to the names in the namedtuple - this is necessary since
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105 # namedtuples can't have fields starting with '_'.
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106 for key in list(context.keys()):
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107 context["key_" + key] = context.pop(key)
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108
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109 # Default to ``None`` for keys missing from the context
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110 for field in key_class._fields:
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111 if field not in context:
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112 context[field] = None
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113
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114 return key_class(**context)
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115
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116
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117 #: A dictionary that maps a scheme to a callable that creates a pool key.
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118 #: This can be used to alter the way pool keys are constructed, if desired.
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119 #: Each PoolManager makes a copy of this dictionary so they can be configured
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120 #: globally here, or individually on the instance.
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121 key_fn_by_scheme = {
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122 "http": functools.partial(_default_key_normalizer, PoolKey),
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123 "https": functools.partial(_default_key_normalizer, PoolKey),
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124 }
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125
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126 pool_classes_by_scheme = {"http": HTTPConnectionPool, "https": HTTPSConnectionPool}
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127
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128
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129 class PoolManager(RequestMethods):
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130 """
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131 Allows for arbitrary requests while transparently keeping track of
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132 necessary connection pools for you.
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133
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134 :param num_pools:
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135 Number of connection pools to cache before discarding the least
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136 recently used pool.
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137
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138 :param headers:
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139 Headers to include with all requests, unless other headers are given
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140 explicitly.
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141
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142 :param \\**connection_pool_kw:
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143 Additional parameters are used to create fresh
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144 :class:`urllib3.connectionpool.ConnectionPool` instances.
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145
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146 Example::
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147
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148 >>> manager = PoolManager(num_pools=2)
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149 >>> r = manager.request('GET', 'http://google.com/')
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150 >>> r = manager.request('GET', 'http://google.com/mail')
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151 >>> r = manager.request('GET', 'http://yahoo.com/')
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152 >>> len(manager.pools)
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153 2
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154
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155 """
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156
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157 proxy = None
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158
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159 def __init__(self, num_pools=10, headers=None, **connection_pool_kw):
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160 RequestMethods.__init__(self, headers)
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161 self.connection_pool_kw = connection_pool_kw
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162 self.pools = RecentlyUsedContainer(num_pools, dispose_func=lambda p: p.close())
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163
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164 # Locally set the pool classes and keys so other PoolManagers can
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165 # override them.
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166 self.pool_classes_by_scheme = pool_classes_by_scheme
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167 self.key_fn_by_scheme = key_fn_by_scheme.copy()
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168
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169 def __enter__(self):
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170 return self
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171
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172 def __exit__(self, exc_type, exc_val, exc_tb):
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173 self.clear()
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174 # Return False to re-raise any potential exceptions
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175 return False
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176
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177 def _new_pool(self, scheme, host, port, request_context=None):
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178 """
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179 Create a new :class:`ConnectionPool` based on host, port, scheme, and
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180 any additional pool keyword arguments.
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181
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182 If ``request_context`` is provided, it is provided as keyword arguments
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183 to the pool class used. This method is used to actually create the
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184 connection pools handed out by :meth:`connection_from_url` and
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185 companion methods. It is intended to be overridden for customization.
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186 """
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187 pool_cls = self.pool_classes_by_scheme[scheme]
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188 if request_context is None:
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189 request_context = self.connection_pool_kw.copy()
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190
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191 # Although the context has everything necessary to create the pool,
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192 # this function has historically only used the scheme, host, and port
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193 # in the positional args. When an API change is acceptable these can
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194 # be removed.
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195 for key in ("scheme", "host", "port"):
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196 request_context.pop(key, None)
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197
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198 if scheme == "http":
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199 for kw in SSL_KEYWORDS:
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200 request_context.pop(kw, None)
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201
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202 return pool_cls(host, port, **request_context)
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203
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204 def clear(self):
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205 """
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206 Empty our store of pools and direct them all to close.
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207
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208 This will not affect in-flight connections, but they will not be
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209 re-used after completion.
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210 """
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211 self.pools.clear()
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212
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213 def connection_from_host(self, host, port=None, scheme="http", pool_kwargs=None):
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214 """
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215 Get a :class:`ConnectionPool` based on the host, port, and scheme.
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216
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217 If ``port`` isn't given, it will be derived from the ``scheme`` using
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218 ``urllib3.connectionpool.port_by_scheme``. If ``pool_kwargs`` is
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219 provided, it is merged with the instance's ``connection_pool_kw``
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220 variable and used to create the new connection pool, if one is
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221 needed.
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222 """
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223
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224 if not host:
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225 raise LocationValueError("No host specified.")
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226
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227 request_context = self._merge_pool_kwargs(pool_kwargs)
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228 request_context["scheme"] = scheme or "http"
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229 if not port:
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230 port = port_by_scheme.get(request_context["scheme"].lower(), 80)
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231 request_context["port"] = port
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232 request_context["host"] = host
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233
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234 return self.connection_from_context(request_context)
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235
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236 def connection_from_context(self, request_context):
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237 """
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238 Get a :class:`ConnectionPool` based on the request context.
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239
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240 ``request_context`` must at least contain the ``scheme`` key and its
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241 value must be a key in ``key_fn_by_scheme`` instance variable.
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242 """
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243 scheme = request_context["scheme"].lower()
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244 pool_key_constructor = self.key_fn_by_scheme[scheme]
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245 pool_key = pool_key_constructor(request_context)
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246
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247 return self.connection_from_pool_key(pool_key, request_context=request_context)
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248
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249 def connection_from_pool_key(self, pool_key, request_context=None):
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250 """
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251 Get a :class:`ConnectionPool` based on the provided pool key.
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252
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253 ``pool_key`` should be a namedtuple that only contains immutable
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254 objects. At a minimum it must have the ``scheme``, ``host``, and
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255 ``port`` fields.
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256 """
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257 with self.pools.lock:
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258 # If the scheme, host, or port doesn't match existing open
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259 # connections, open a new ConnectionPool.
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260 pool = self.pools.get(pool_key)
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261 if pool:
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262 return pool
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263
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264 # Make a fresh ConnectionPool of the desired type
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265 scheme = request_context["scheme"]
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266 host = request_context["host"]
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267 port = request_context["port"]
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268 pool = self._new_pool(scheme, host, port, request_context=request_context)
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269 self.pools[pool_key] = pool
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270
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271 return pool
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272
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273 def connection_from_url(self, url, pool_kwargs=None):
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274 """
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275 Similar to :func:`urllib3.connectionpool.connection_from_url`.
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276
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277 If ``pool_kwargs`` is not provided and a new pool needs to be
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278 constructed, ``self.connection_pool_kw`` is used to initialize
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279 the :class:`urllib3.connectionpool.ConnectionPool`. If ``pool_kwargs``
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280 is provided, it is used instead. Note that if a new pool does not
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281 need to be created for the request, the provided ``pool_kwargs`` are
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282 not used.
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283 """
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284 u = parse_url(url)
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285 return self.connection_from_host(
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286 u.host, port=u.port, scheme=u.scheme, pool_kwargs=pool_kwargs
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287 )
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288
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289 def _merge_pool_kwargs(self, override):
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290 """
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291 Merge a dictionary of override values for self.connection_pool_kw.
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292
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293 This does not modify self.connection_pool_kw and returns a new dict.
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294 Any keys in the override dictionary with a value of ``None`` are
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295 removed from the merged dictionary.
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296 """
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297 base_pool_kwargs = self.connection_pool_kw.copy()
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298 if override:
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299 for key, value in override.items():
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300 if value is None:
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301 try:
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302 del base_pool_kwargs[key]
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303 except KeyError:
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304 pass
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305 else:
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306 base_pool_kwargs[key] = value
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307 return base_pool_kwargs
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308
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309 def urlopen(self, method, url, redirect=True, **kw):
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310 """
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311 Same as :meth:`urllib3.connectionpool.HTTPConnectionPool.urlopen`
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312 with custom cross-host redirect logic and only sends the request-uri
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313 portion of the ``url``.
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314
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315 The given ``url`` parameter must be absolute, such that an appropriate
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316 :class:`urllib3.connectionpool.ConnectionPool` can be chosen for it.
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317 """
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318 u = parse_url(url)
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319 conn = self.connection_from_host(u.host, port=u.port, scheme=u.scheme)
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320
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321 kw["assert_same_host"] = False
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322 kw["redirect"] = False
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323
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324 if "headers" not in kw:
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325 kw["headers"] = self.headers.copy()
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326
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327 if self.proxy is not None and u.scheme == "http":
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328 response = conn.urlopen(method, url, **kw)
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329 else:
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330 response = conn.urlopen(method, u.request_uri, **kw)
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331
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332 redirect_location = redirect and response.get_redirect_location()
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333 if not redirect_location:
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334 return response
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335
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336 # Support relative URLs for redirecting.
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337 redirect_location = urljoin(url, redirect_location)
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338
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339 # RFC 7231, Section 6.4.4
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340 if response.status == 303:
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341 method = "GET"
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342
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343 retries = kw.get("retries")
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344 if not isinstance(retries, Retry):
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345 retries = Retry.from_int(retries, redirect=redirect)
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346
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347 # Strip headers marked as unsafe to forward to the redirected location.
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348 # Check remove_headers_on_redirect to avoid a potential network call within
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349 # conn.is_same_host() which may use socket.gethostbyname() in the future.
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350 if retries.remove_headers_on_redirect and not conn.is_same_host(
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351 redirect_location
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352 ):
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353 headers = list(six.iterkeys(kw["headers"]))
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354 for header in headers:
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355 if header.lower() in retries.remove_headers_on_redirect:
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356 kw["headers"].pop(header, None)
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357
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358 try:
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359 retries = retries.increment(method, url, response=response, _pool=conn)
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360 except MaxRetryError:
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361 if retries.raise_on_redirect:
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362 raise
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363 return response
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364
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365 kw["retries"] = retries
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366 kw["redirect"] = redirect
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367
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368 log.info("Redirecting %s -> %s", url, redirect_location)
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369 return self.urlopen(method, redirect_location, **kw)
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370
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371
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372 class ProxyManager(PoolManager):
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373 """
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374 Behaves just like :class:`PoolManager`, but sends all requests through
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375 the defined proxy, using the CONNECT method for HTTPS URLs.
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376
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377 :param proxy_url:
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378 The URL of the proxy to be used.
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379
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380 :param proxy_headers:
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381 A dictionary containing headers that will be sent to the proxy. In case
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382 of HTTP they are being sent with each request, while in the
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383 HTTPS/CONNECT case they are sent only once. Could be used for proxy
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384 authentication.
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385
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386 Example:
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387 >>> proxy = urllib3.ProxyManager('http://localhost:3128/')
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388 >>> r1 = proxy.request('GET', 'http://google.com/')
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389 >>> r2 = proxy.request('GET', 'http://httpbin.org/')
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390 >>> len(proxy.pools)
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391 1
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392 >>> r3 = proxy.request('GET', 'https://httpbin.org/')
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393 >>> r4 = proxy.request('GET', 'https://twitter.com/')
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394 >>> len(proxy.pools)
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395 3
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396
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397 """
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398
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399 def __init__(
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400 self,
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401 proxy_url,
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402 num_pools=10,
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403 headers=None,
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404 proxy_headers=None,
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405 **connection_pool_kw
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406 ):
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407
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408 if isinstance(proxy_url, HTTPConnectionPool):
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409 proxy_url = "%s://%s:%i" % (
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410 proxy_url.scheme,
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411 proxy_url.host,
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412 proxy_url.port,
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413 )
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414 proxy = parse_url(proxy_url)
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415 if not proxy.port:
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416 port = port_by_scheme.get(proxy.scheme, 80)
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417 proxy = proxy._replace(port=port)
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418
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419 if proxy.scheme not in ("http", "https"):
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420 raise ProxySchemeUnknown(proxy.scheme)
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421
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422 self.proxy = proxy
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423 self.proxy_headers = proxy_headers or {}
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424
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425 connection_pool_kw["_proxy"] = self.proxy
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426 connection_pool_kw["_proxy_headers"] = self.proxy_headers
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427
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428 super(ProxyManager, self).__init__(num_pools, headers, **connection_pool_kw)
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429
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430 def connection_from_host(self, host, port=None, scheme="http", pool_kwargs=None):
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431 if scheme == "https":
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432 return super(ProxyManager, self).connection_from_host(
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433 host, port, scheme, pool_kwargs=pool_kwargs
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434 )
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435
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436 return super(ProxyManager, self).connection_from_host(
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437 self.proxy.host, self.proxy.port, self.proxy.scheme, pool_kwargs=pool_kwargs
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438 )
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439
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440 def _set_proxy_headers(self, url, headers=None):
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441 """
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442 Sets headers needed by proxies: specifically, the Accept and Host
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443 headers. Only sets headers not provided by the user.
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444 """
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445 headers_ = {"Accept": "*/*"}
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446
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447 netloc = parse_url(url).netloc
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448 if netloc:
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449 headers_["Host"] = netloc
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450
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451 if headers:
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452 headers_.update(headers)
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453 return headers_
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454
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455 def urlopen(self, method, url, redirect=True, **kw):
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456 "Same as HTTP(S)ConnectionPool.urlopen, ``url`` must be absolute."
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457 u = parse_url(url)
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458
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459 if u.scheme == "http":
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460 # For proxied HTTPS requests, httplib sets the necessary headers
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461 # on the CONNECT to the proxy. For HTTP, we'll definitely
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462 # need to set 'Host' at the very least.
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463 headers = kw.get("headers", self.headers)
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464 kw["headers"] = self._set_proxy_headers(url, headers)
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465
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466 return super(ProxyManager, self).urlopen(method, url, redirect=redirect, **kw)
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467
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468
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469 def proxy_from_url(url, **kw):
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470 return ProxyManager(proxy_url=url, **kw)