Implemented #439. Added supporting test.

requests/sessions.py

@@ -52,7 +52,7 @@ class Session(object):
 
     __attrs__ = [
         'headers', 'cookies', 'auth', 'timeout', 'proxies', 'hooks',
-        'params', 'config']
+        'params', 'config', 'verify']
 
 
     def __init__(self,
@@ -79,10 +79,7 @@ class Session(object):
         for (k, v) in list(defaults.items()):
             self.config.setdefault(k, v)
 
-        self.poolmanager = PoolManager(
-            num_pools=self.config.get('pool_connections'),
-            maxsize=self.config.get('pool_maxsize')
-        )
+        self.init_poolmanager()
 
         # Set up a CookieJar to be used by default
         self.cookies = {}
@@ -91,6 +88,12 @@ class Session(object):
         if cookies is not None:
             self.cookies.update(cookies)
 
+    def init_poolmanager(self):
+        self.poolmanager = PoolManager(
+            num_pools=self.config.get('pool_connections'),
+            maxsize=self.config.get('pool_maxsize')
+        )
+
     def __repr__(self):
         return '<requests-client at 0x%x>' % (id(self))
 
@@ -146,9 +149,6 @@ class Session(object):
         params = {} if params is None else params
         hooks = {} if hooks is None else hooks
 
-        if verify is None:
-            verify = self.verify
-
         # use session's hooks as defaults
         for key, cb in list(self.hooks.items()):
             hooks.setdefault(key, cb)
@@ -281,6 +281,15 @@ class Session(object):
 
         return self.request('delete', url, **kwargs)
 
+    def __getstate__(self):
+        return dict((attr, getattr(self, attr, None)) for attr in self.__attrs__)
+
+    def __setstate__(self, state):
+        for attr, value in state.items():
+            setattr(self, attr, value)
+
+        self.init_poolmanager()
+
 
 def session(**kwargs):
     """Returns a :class:`Session` for context-management."""

tests/test_requests.py

@@ -13,6 +13,7 @@ import time
 import os
 import sys
 import unittest
+import pickle
 
 import requests
 from requests.compat import str, bytes, StringIO
@@ -729,6 +730,19 @@ class RequestsTestSuite(TestSetup, unittest.TestCase):
         assert params3['b'] in r3.text
         assert params3['c'] in r3.text
 
+    def test_session_pickling(self):
+
+        s = requests.session(
+                headers={'header': 'value'},
+                cookies={'a-cookie': 'cookie-value'},
+                auth=('username', 'password'))
+
+        ds = pickle.loads(pickle.dumps(s))
+
+        self.assertEqual(s.headers, ds.headers)
+        self.assertEqual(s.cookies, ds.cookies)
+        self.assertEqual(s.auth, ds.auth)
+
     def test_invalid_content(self):
         # WARNING: if you're using a terrible DNS provider (comcast),
         # this will fail.