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annotate env/lib/python3.7/site-packages/requests_toolbelt/adapters/appengine.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 # -*- coding: utf-8 -*-
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2 """The App Engine Transport Adapter for requests.
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3
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4 .. versionadded:: 0.6.0
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5
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6 This requires a version of requests >= 2.10.0 and Python 2.
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7
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8 There are two ways to use this library:
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9
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10 #. If you're using requests directly, you can use code like:
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11
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12 .. code-block:: python
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13
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14 >>> import requests
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15 >>> import ssl
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16 >>> import requests.packages.urllib3.contrib.appengine as ul_appengine
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17 >>> from requests_toolbelt.adapters import appengine
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18 >>> s = requests.Session()
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19 >>> if ul_appengine.is_appengine_sandbox():
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20 ... s.mount('http://', appengine.AppEngineAdapter())
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21 ... s.mount('https://', appengine.AppEngineAdapter())
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22
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23 #. If you depend on external libraries which use requests, you can use code
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24 like:
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25
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26 .. code-block:: python
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27
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28 >>> from requests_toolbelt.adapters import appengine
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29 >>> appengine.monkeypatch()
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30
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31 which will ensure all requests.Session objects use AppEngineAdapter properly.
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32
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33 You are also able to :ref:`disable certificate validation <insecure_appengine>`
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34 when monkey-patching.
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35 """
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36 import requests
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37 import warnings
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38 from requests import adapters
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39 from requests import sessions
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40
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41 from .. import exceptions as exc
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42 from .._compat import gaecontrib
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43 from .._compat import timeout
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44
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45
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46 class AppEngineMROHack(adapters.HTTPAdapter):
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47 """Resolves infinite recursion when monkeypatching.
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48
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49 This works by injecting itself as the base class of both the
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50 :class:`AppEngineAdapter` and Requests' default HTTPAdapter, which needs to
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51 be done because default HTTPAdapter's MRO is recompiled when we
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52 monkeypatch, at which point this class becomes HTTPAdapter's base class.
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53 In addition, we use an instantiation flag to avoid infinite recursion.
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54 """
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55 _initialized = False
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56
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57 def __init__(self, *args, **kwargs):
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58 if not self._initialized:
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59 self._initialized = True
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60 super(AppEngineMROHack, self).__init__(*args, **kwargs)
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61
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62
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63 class AppEngineAdapter(AppEngineMROHack, adapters.HTTPAdapter):
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64 """The transport adapter for Requests to use urllib3's GAE support.
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65
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66 Implements Requests's HTTPAdapter API.
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67
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68 When deploying to Google's App Engine service, some of Requests'
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69 functionality is broken. There is underlying support for GAE in urllib3.
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70 This functionality, however, is opt-in and needs to be enabled explicitly
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71 for Requests to be able to use it.
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72 """
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73
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74 __attrs__ = adapters.HTTPAdapter.__attrs__ + ['_validate_certificate']
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75
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76 def __init__(self, validate_certificate=True, *args, **kwargs):
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77 _check_version()
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78 self._validate_certificate = validate_certificate
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79 super(AppEngineAdapter, self).__init__(*args, **kwargs)
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80
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81 def init_poolmanager(self, connections, maxsize, block=False):
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82 self.poolmanager = _AppEnginePoolManager(self._validate_certificate)
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83
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84
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85 class InsecureAppEngineAdapter(AppEngineAdapter):
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86 """An always-insecure GAE adapter for Requests.
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87
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88 This is a variant of the the transport adapter for Requests to use
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89 urllib3's GAE support that does not validate certificates. Use with
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90 caution!
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91
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92 .. note::
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93 The ``validate_certificate`` keyword argument will not be honored here
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94 and is not part of the signature because we always force it to
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95 ``False``.
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96
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97 See :class:`AppEngineAdapter` for further details.
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98 """
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99
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100 def __init__(self, *args, **kwargs):
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101 if kwargs.pop("validate_certificate", False):
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102 warnings.warn("Certificate validation cannot be specified on the "
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103 "InsecureAppEngineAdapter, but was present. This "
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104 "will be ignored and certificate validation will "
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105 "remain off.", exc.IgnoringGAECertificateValidation)
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106
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107 super(InsecureAppEngineAdapter, self).__init__(
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108 validate_certificate=False, *args, **kwargs)
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109
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110
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111 class _AppEnginePoolManager(object):
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112 """Implements urllib3's PoolManager API expected by requests.
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113
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114 While a real PoolManager map hostnames to reusable Connections,
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115 AppEngine has no concept of a reusable connection to a host.
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116 So instead, this class constructs a small Connection per request,
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117 that is returned to the Adapter and used to access the URL.
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118 """
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119
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120 def __init__(self, validate_certificate=True):
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121 self.appengine_manager = gaecontrib.AppEngineManager(
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122 validate_certificate=validate_certificate)
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123
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124 def connection_from_url(self, url):
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125 return _AppEngineConnection(self.appengine_manager, url)
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126
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127 def clear(self):
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128 pass
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129
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130
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131 class _AppEngineConnection(object):
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132 """Implements urllib3's HTTPConnectionPool API's urlopen().
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133
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134 This Connection's urlopen() is called with a host-relative path,
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135 so in order to properly support opening the URL, we need to store
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136 the full URL when this Connection is constructed from the PoolManager.
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137
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138 This code wraps AppEngineManager.urlopen(), which exposes a different
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139 API than in the original urllib3 urlopen(), and thus needs this adapter.
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140 """
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141
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142 def __init__(self, appengine_manager, url):
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143 self.appengine_manager = appengine_manager
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144 self.url = url
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145
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146 def urlopen(self, method, url, body=None, headers=None, retries=None,
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147 redirect=True, assert_same_host=True,
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148 timeout=timeout.Timeout.DEFAULT_TIMEOUT,
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149 pool_timeout=None, release_conn=None, **response_kw):
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150 # This function's url argument is a host-relative URL,
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151 # but the AppEngineManager expects an absolute URL.
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152 # So we saved out the self.url when the AppEngineConnection
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153 # was constructed, which we then can use down below instead.
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154
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155 # We once tried to verify our assumptions here, but sometimes the
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156 # passed-in URL differs on url fragments, or "http://a.com" vs "/".
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157
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158 # urllib3's App Engine adapter only uses Timeout.total, not read or
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159 # connect.
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160 if not timeout.total:
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161 timeout.total = timeout._read or timeout._connect
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162
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163 # Jump through the hoops necessary to call AppEngineManager's API.
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164 return self.appengine_manager.urlopen(
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165 method,
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166 self.url,
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167 body=body,
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168 headers=headers,
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169 retries=retries,
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170 redirect=redirect,
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171 timeout=timeout,
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172 **response_kw)
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173
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174
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175 def monkeypatch(validate_certificate=True):
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176 """Sets up all Sessions to use AppEngineAdapter by default.
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177
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178 If you don't want to deal with configuring your own Sessions,
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179 or if you use libraries that use requests directly (ie requests.post),
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180 then you may prefer to monkeypatch and auto-configure all Sessions.
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181
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182 .. warning: :
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183
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184 If ``validate_certificate`` is ``False``, certification validation will
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185 effectively be disabled for all requests.
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186 """
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187 _check_version()
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188 # HACK: We should consider modifying urllib3 to support this cleanly,
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189 # so that we can set a module-level variable in the sessions module,
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190 # instead of overriding an imported HTTPAdapter as is done here.
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191 adapter = AppEngineAdapter
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192 if not validate_certificate:
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193 adapter = InsecureAppEngineAdapter
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194
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195 sessions.HTTPAdapter = adapter
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196 adapters.HTTPAdapter = adapter
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197
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198
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199 def _check_version():
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200 if gaecontrib is None:
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201 raise exc.VersionMismatchError(
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202 "The toolbelt requires at least Requests 2.10.0 to be "
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203 "installed. Version {0} was found instead.".format(
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204 requests.__version__
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205 )
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206 )