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    <p>The following code needs requests from git (especially <code>requests.packages.urllib3.poolmanager.PoolManager._new_pool()</code>)</p> <p>I tested it using <code>ncat -v -l 127.0.0.1 8000</code></p> <p>The problem is the fact, that the connection isn't opened by urllib3 but by httplib from the standard library.</p> <pre><code>import socket import requests from requests.adapters import HTTPAdapter from requests.packages.urllib3 import PoolManager, HTTPConnectionPool try: from http.client import HTTPConnection except ImportError: from httplib import HTTPConnection class MyAdapter(HTTPAdapter): def init_poolmanager(self, connections, maxsize): self.poolmanager = MyPoolManager(num_pools=connections, maxsize=maxsize) class MyPoolManager(PoolManager): def _new_pool(self, scheme, host, port): # Important! if scheme == 'http' and host == my_host and port == my_port: return MyHTTPConnectionPool(host, port, **self.connection_pool_kw) return super(PoolManager, self)._new_pool(self, scheme, host, port) class MyHTTPConnectionPool(HTTPConnectionPool): def _new_conn(self): self.num_connections += 1 return MyHTTPConnection(host=self.host, port=self.port, strict=self.strict) class MyHTTPConnection(HTTPConnection): def connect(self): """Connect to the host and port specified in __init__.""" # Original # self.sock = socket.create_connection((self.host, self.port), # self.timeout, self.source_address) # Important! self.sock = my_socket if self._tunnel_host: self._tunnel() if __name__ == '__main__': import time my_host = '127.0.0.1' my_port = 8000 my_socket = socket.create_connection((my_host, my_port)) time.sleep(4) s = requests.Session() s.mount('http://', MyAdapter()) s.get('http://127.0.0.1:8000/foo') </code></pre> <p>Edit:</p> <p>Or direct monkeypatching of the connectionpool:</p> <pre><code>class MyHTTPConnection(HTTPConnection): def connect(self): self.sock = my_socket if self._tunnel_host: self._tunnel() requests.packages.urllib3.connectionpool.HTTPConnection = MyHTTPConnection if __name__ == '__main__': my_host = '127.0.0.1' my_port = 8000 my_socket = socket.create_connection((my_host, my_port)) requests.get('http://127.0.0.1:8000/foo') </code></pre>
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