Merge pull request #133 from IvanMalison/custom_patches

Custom patches

.travis.yml

@@ -8,6 +8,7 @@ env:
     - WITH_LIB="requests2.2"
     - WITH_LIB="requests2.3"
     - WITH_LIB="requests2.4"
+    - WITH_LIB="requests2.5"
     - WITH_LIB="requests1.x"
     - WITH_LIB="httplib2"
     - WITH_LIB="boto"
@@ -33,6 +34,7 @@ install:
 - if [ $WITH_LIB = "requests2.2" ] ; then pip install requests==2.2.1; fi
 - if [ $WITH_LIB = "requests2.3" ] ; then pip install requests==2.3.0; fi
 - if [ $WITH_LIB = "requests2.4" ] ; then pip install requests==2.4.0; fi
+- if [ $WITH_LIB = "requests2.5" ] ; then pip install requests==2.5.0; fi
 - if [ $WITH_LIB = "httplib2" ] ; then pip install httplib2; fi
 - if [ $WITH_LIB = "boto" ] ; then pip install boto; fi
 script: python setup.py test

README.md

@@ -457,6 +457,15 @@ API in version 1.0.x
 
 
 ## Changelog
+  * 1.2.0 Add custom_patches argument to VCR/Cassette objects to allow
+    users to stub custom classes when cassettes become active.
+  * 1.1.4 Add force reset around calls to actual connection from stubs, to ensure
+    compatibility with the version of httplib/urlib2 in python 2.7.9.
+  * 1.1.3 Fix python3 headers field (thanks @rtaboada), fix boto test (thanks
+    @telaviv), fix new_episodes record mode (thanks @jashugan), fix Windows
+    connectionpool stub bug (thanks @gazpachoking), add support for requests 2.5
+  * 1.1.2 Add urllib==1.7.1 support. Make json serialize error handling correct
+    Improve logging of match failures.
   * 1.1.1 Use function signature preserving `wrapt.decorator` to write the
     decorator version of use_cassette in order to ensure compatibility with
     py.test fixtures and python 2. Move all request filtering into the

setup.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+##!/usr/bin/env python
 
 import sys
 from setuptools import setup
@@ -20,7 +20,7 @@ class PyTest(TestCommand):
 
 setup(
     name='vcrpy',
-    version='1.1.1',
+    version='1.2.0',
     description=(
         "Automatically mock your HTTP interactions to simplify and "
         "speed up testing"

tests/integration/test_basic.py

@@ -1,4 +1,4 @@
-'''Basic tests about cassettes'''
+'''Basic tests for cassettes'''
 # coding=utf-8
 
 # External imports

tests/integration/test_boto.py

@@ -14,7 +14,7 @@ def test_boto_stubs(tmpdir):
         from boto.https_connection import CertValidatingHTTPSConnection
         from vcr.stubs.boto_stubs import VCRCertValidatingHTTPSConnection
         # Prove that the class was patched by the stub and that we can instantiate it.
-        assert CertValidatingHTTPSConnection is VCRCertValidatingHTTPSConnection
+        assert issubclass(CertValidatingHTTPSConnection, VCRCertValidatingHTTPSConnection)
         CertValidatingHTTPSConnection('hostname.does.not.matter')
 
 def test_boto_without_vcr():

tests/integration/test_record_mode.py

@@ -72,6 +72,31 @@ def test_new_episodes_record_mode(tmpdir):
         assert len(cass.responses) == 2
 
 
+def test_new_episodes_record_mode_two_times(tmpdir):
+    testfile = str(tmpdir.join('recordmode.yml'))
+    url = 'http://httpbin.org/bytes/1024'
+    with vcr.use_cassette(testfile, record_mode="new_episodes"):
+        # cassette file doesn't exist, so create.
+        original_first_response = urlopen(url).read()
+
+    with vcr.use_cassette(testfile, record_mode="new_episodes"):
+        # make the same request again
+        assert urlopen(url).read() == original_first_response
+
+        # in the "new_episodes" record mode, we can add the same request
+        # to the cassette without repercussions
+        original_second_response = urlopen(url).read()
+
+    with vcr.use_cassette(testfile, record_mode="once"):
+        # make the same request again
+        assert urlopen(url).read() == original_first_response
+        assert urlopen(url).read() == original_second_response
+        # now that we are back in once mode, this should raise
+        # an error.
+        with pytest.raises(Exception):
+            urlopen(url).read()
+
+
 def test_all_record_mode(tmpdir):
     testfile = str(tmpdir.join('recordmode.yml'))
 

tests/unit/test_cassettes.py

@@ -7,8 +7,10 @@ import pytest
 import yaml
 
 from vcr.cassette import Cassette
-from vcr.patch import force_reset
 from vcr.errors import UnhandledHTTPRequestError
+from vcr.patch import force_reset
+from vcr.stubs import VCRHTTPSConnection
+
 
 
 def test_cassette_load(tmpdir):
@@ -181,3 +183,21 @@ def test_nesting_context_managers_by_checking_references_of_http_connection():
                     assert httplib.HTTPConnection is original
             assert httplib.HTTPConnection is second_cassette_HTTPConnection
         assert httplib.HTTPConnection is first_cassette_HTTPConnection
+
+
+def test_custom_patchers():
+    class Test(object):
+        attribute = None
+    with Cassette.use('custom_patches', custom_patches=((Test, 'attribute', VCRHTTPSConnection),)):
+        assert issubclass(Test.attribute, VCRHTTPSConnection)
+        assert VCRHTTPSConnection is not Test.attribute
+        old_attribute = Test.attribute
+
+        with Cassette.use('custom_patches', custom_patches=((Test, 'attribute', VCRHTTPSConnection),)):
+            assert issubclass(Test.attribute, VCRHTTPSConnection)
+            assert VCRHTTPSConnection is not Test.attribute
+            assert  Test.attribute is not old_attribute
+
+        assert issubclass(Test.attribute, VCRHTTPSConnection)
+        assert VCRHTTPSConnection is not Test.attribute
+        assert  Test.attribute is old_attribute

tests/unit/test_response.py

@@ -0,0 +1,68 @@
+# coding: UTF-8
+from vcr.stubs import VCRHTTPResponse
+
+
+def test_response_should_have_headers_field():
+    recorded_response = {
+        "status": {
+            "message": "OK",
+            "code": 200
+        },
+        "headers": {
+            "content-length": ["0"],
+            "server": ["gunicorn/18.0"],
+            "connection": ["Close"],
+            "access-control-allow-credentials": ["true"],
+            "date": ["Fri, 24 Oct 2014 18:35:37 GMT"],
+            "access-control-allow-origin": ["*"],
+            "content-type": ["text/html; charset=utf-8"],
+        },
+        "body": {
+            "string": b""
+        }
+    }
+    response = VCRHTTPResponse(recorded_response)
+
+    assert response.headers is not None
+
+
+def test_response_headers_should_be_equal_to_msg():
+    recorded_response = {
+        "status": {
+            "message": b"OK",
+            "code": 200
+        },
+        "headers": {
+            "content-length": ["0"],
+            "server": ["gunicorn/18.0"],
+            "connection": ["Close"],
+            "content-type": ["text/html; charset=utf-8"],
+        },
+        "body": {
+            "string": b""
+        }
+    }
+    response = VCRHTTPResponse(recorded_response)
+
+    assert response.headers == response.msg
+
+
+def test_response_headers_should_have_correct_values():
+    recorded_response = {
+        "status": {
+            "message": "OK",
+            "code": 200
+        },
+        "headers": {
+            "content-length": ["10806"],
+            "date": ["Fri, 24 Oct 2014 18:35:37 GMT"],
+            "content-type": ["text/html; charset=utf-8"],
+        },
+        "body": {
+            "string": b""
+        }
+    }
+    response = VCRHTTPResponse(recorded_response)
+
+    assert response.headers.get('content-length') == "10806"
+    assert response.headers.get('date') == "Fri, 24 Oct 2014 18:35:37 GMT"

tests/unit/test_serialize.py

@@ -1,21 +1,35 @@
+import mock
 import pytest
+
 from vcr.serialize import deserialize
 from vcr.serializers import yamlserializer, jsonserializer
 
+
 def test_deserialize_old_yaml_cassette():
     with open('tests/fixtures/migration/old_cassette.yaml', 'r') as f:
         with pytest.raises(ValueError):
             deserialize(f.read(), yamlserializer)
 
+
 def test_deserialize_old_json_cassette():
     with open('tests/fixtures/migration/old_cassette.json', 'r') as f:
         with pytest.raises(ValueError):
             deserialize(f.read(), jsonserializer)
 
+
 def test_deserialize_new_yaml_cassette():
     with open('tests/fixtures/migration/new_cassette.yaml', 'r') as f:
         deserialize(f.read(), yamlserializer)
 
+
 def test_deserialize_new_json_cassette():
     with open('tests/fixtures/migration/new_cassette.json', 'r') as f:
         deserialize(f.read(), jsonserializer)
+
+
+@mock.patch.object(jsonserializer.json, 'dumps',
+                   side_effect=UnicodeDecodeError('utf-8', b'unicode error in serialization',
+                                                  0, 10, 'blew up'))
+def test_serialize_constructs_UnicodeDecodeError(mock_dumps):
+    with pytest.raises(UnicodeDecodeError):
+        jsonserializer.serialize({})

tests/unit/test_vcr.py

@@ -3,6 +3,7 @@ import pytest
 
 from vcr import VCR, use_cassette
 from vcr.request import Request
+from vcr.stubs import VCRHTTPSConnection
 
 
 def test_vcr_use_cassette():
@@ -74,3 +75,18 @@ def test_fixtures_with_use_cassette(random_fixture):
     # fixtures. It is admittedly a bit strange because the test would never even
     # run if the relevant feature were broken.
     pass
+
+
+def test_custom_patchers():
+    class Test(object):
+        attribute = None
+        attribute2 = None
+    test_vcr = VCR(custom_patches=((Test, 'attribute', VCRHTTPSConnection),))
+    with test_vcr.use_cassette('custom_patches'):
+        assert issubclass(Test.attribute, VCRHTTPSConnection)
+        assert VCRHTTPSConnection is not Test.attribute
+
+    with test_vcr.use_cassette('custom_patches', custom_patches=((Test, 'attribute2', VCRHTTPSConnection),)):
+        assert issubclass(Test.attribute, VCRHTTPSConnection)
+        assert VCRHTTPSConnection is not Test.attribute
+        assert Test.attribute is Test.attribute2

tox.ini

@@ -1,188 +1,25 @@
-# Tox (http://tox.testrun.org/) is a tool for running tests
-# in multiple virtualenvs. This configuration file will run the
-# test suite on all supported python versions. To use it, "pip install tox"
-# and then run "tox" from this directory.
-
 [tox]
-envlist = 
-    py26,
-    py27,
-    py33,
-    py34,
-    pypy,
-    py26requests24,
-    py27requests24,
-    py34requests24,
-    pypyrequests24,
-    py26requests23,
-    py27requests23,
-    py34requests23,
-    pypyrequests23,
-    py26requests22,
-    py27requests22,
-    py34requests22,
-    pypyrequests22,
-    py26requests1,
-    py27requests1,
-    py33requests1,
-    pypyrequests1,
-    py26httplib2,
-    py27httplib2,
-    py33httplib2,
-    py34httplib2,
-    pypyhttplib2,
+envlist = {py26,py27,py33,py34,pypy}-{requests25,requests24,requests23,requests22,requests1,httplib2,urllib3,boto}
 
 [testenv]
 commands =
     py.test {posargs}
+basepython =
+    py26: python2.6
+    py27: python2.7
+    py33: python3.3
+    py34: python3.4
+    pypy: pypy
 deps =
     mock
     pytest
     pytest-localserver
     PyYAML
-    ipdb
-
-[testenv:py26requests1]
-basepython = python2.6
-deps =
-    {[testenv]deps}
-    requests==1.2.3
-
-[testenv:py27requests1]
-basepython = python2.7
-deps =
-    {[testenv]deps}
-    requests==1.2.3
-
-[testenv:py33requests1]
-basepython = python3.3
-deps =
-    {[testenv]deps}
-    requests==1.2.3
-
-[testenv:pypyrequests1]
-basepython = pypy
-deps =
-    {[testenv]deps}
-    requests==1.2.3
-
-[testenv:py26requests24]
-basepython = python2.6
-deps =
-    {[testenv]deps}
-    requests==2.4.0
-
-[testenv:py27requests24]
-basepython = python2.7
-deps =
-    {[testenv]deps}
-    requests==2.4.0
-
-[testenv:py33requests24]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    requests==2.4.0
-
-[testenv:py34requests24]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    requests==2.4.0
-
-[testenv:pypyrequests24]
-basepython = pypy
-deps =
-    {[testenv]deps}
-    requests==2.4.0
-
-[testenv:py26requests23]
-basepython = python2.6
-deps =
-    {[testenv]deps}
-    requests==2.3.0
-
-[testenv:py27requests23]
-basepython = python2.7
-deps =
-    {[testenv]deps}
-    requests==2.3.0
-
-[testenv:py33requests23]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    requests==2.3.0
-
-[testenv:py34requests23]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    requests==2.3.0
-
-[testenv:pypyrequests23]
-basepython = pypy
-deps =
-    {[testenv]deps}
-    requests==2.3.0
-
-[testenv:py26requests22]
-basepython = python2.6
-deps =
-    {[testenv]deps}
-    requests==2.2.1
-
-[testenv:py27requests22]
-basepython = python2.7
-deps =
-    {[testenv]deps}
-    requests==2.2.1
-
-[testenv:py33requests22]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    requests==2.2.1
-
-[testenv:py34requests22]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    requests==2.2.1
-    
-
-[testenv:pypyrequests22]
-basepython = pypy
-deps =
-    {[testenv]deps}
-    requests==2.2.1
-
-[testenv:py26httplib2]
-basepython = python2.6
-deps =
-    {[testenv]deps}
-    httplib2
-
-[testenv:py27httplib2]
-basepython = python2.7
-deps =
-    {[testenv]deps}
-    httplib2
-
-[testenv:py33httplib2]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    httplib2
-
-[testenv:py34httplib2]
-basepython = python3.4
-deps =
-    {[testenv]deps}
-    httplib2
-
-[testenv:pypyhttplib2]
-basepython = pypy
-deps =
-    {[testenv]deps}
-    httplib2
+    requests1: requests==1.2.3
+    requests25: requests==2.5.0
+    requests24: requests==2.4.0
+    requests23: requests==2.3.0
+    requests22: requests==2.2.1
+    httplib2: httplib2
+    urllib3: urllib3==1.7.1
+    boto: boto

vcr/cassette.py

@@ -1,4 +1,4 @@
-'''The container for recorded requests and responses'''
+"""The container for recorded requests and responses"""
 import logging
 
 import contextlib2
@@ -24,7 +24,7 @@ class CassetteContextDecorator(object):
     removing cassettes.
 
     This class defers the creation of a new cassette instance until the point at
-    which it is installned by context manager or decorator. The fact that a new
+    which it is installed by context manager or decorator. The fact that a new
     cassette is used with each application prevents the state of any cassette
     from interfering with another.
     """
@@ -45,7 +45,8 @@ class CassetteContextDecorator(object):
             log.debug('Entered context for cassette at {0}.'.format(cassette._path))
             yield cassette
             log.debug('Exiting context for cassette at {0}.'.format(cassette._path))
-             # TODO(@IvanMalison): Hmmm. it kind of feels like this should be somewhere else.
+            # TODO(@IvanMalison): Hmmm. it kind of feels like this should be
+            # somewhere else.
             cassette._save()
 
     def __enter__(self):
@@ -65,11 +66,11 @@ class CassetteContextDecorator(object):
 
 
 class Cassette(object):
-    '''A container for recorded requests and responses'''
+    """A container for recorded requests and responses"""
 
     @classmethod
     def load(cls, path, **kwargs):
-        '''Instantiate and load the cassette stored at the specified path.'''
+        """Instantiate and load the cassette stored at the specified path."""
         new_cassette = cls(path, **kwargs)
         new_cassette._load()
         return new_cassette
@@ -85,7 +86,8 @@ class Cassette(object):
     def __init__(self, path, serializer=yamlserializer, record_mode='once',
                  match_on=(uri, method), filter_headers=(),
                  filter_query_parameters=(), before_record_request=None,
-                 before_record_response=None, ignore_hosts=(), ignore_localhost=()):
+                 before_record_response=None, ignore_hosts=(),
+                 ignore_localhost=(), custom_patches=()):
         self._path = path
         self._serializer = serializer
         self._match_on = match_on
@@ -98,6 +100,7 @@ class Cassette(object):
         self.dirty = False
         self.rewound = False
         self.record_mode = record_mode
+        self.custom_patches = custom_patches
 
     @property
     def play_count(self):
@@ -105,9 +108,7 @@ class Cassette(object):
 
     @property
     def all_played(self):
-        """
-        Returns True if all responses have been played, False otherwise.
-        """
+        """Returns True if all responses have been played, False otherwise."""
         return self.play_count == len(self)
 
     @property
@@ -124,7 +125,7 @@ class Cassette(object):
             self.record_mode == 'none'
 
     def append(self, request, response):
-        '''Add a request, response pair to this cassette'''
+        """Add a request, response pair to this cassette"""
         request = self._before_record_request(request)
         if not request:
             return
@@ -153,10 +154,10 @@ class Cassette(object):
             self.rewound
 
     def play_response(self, request):
-        '''
+        """
         Get the response corresponding to a request, but only if it
         hasn't been played back before, and mark it as played
-        '''
+        """
         for index, response in self._responses(request):
             if self.play_counts[index] == 0:
                 self.play_counts[index] += 1
@@ -168,11 +169,11 @@ class Cassette(object):
         )
 
     def responses_of(self, request):
-        '''
+        """
         Find the responses corresponding to a request.
         This function isn't actually used by VCR internally, but is
         provided as an external API.
-        '''
+        """
         responses = [response for index, response in self._responses(request)]
 
         if responses:
@@ -214,11 +215,12 @@ class Cassette(object):
         )
 
     def __len__(self):
-        '''Return the number of request,response pairs stored in here'''
+        """Return the number of request,response pairs stored in here"""
         return len(self.data)
 
     def __contains__(self, request):
-        '''Return whether or not a request has been stored'''
-        for response in self._responses(request):
-            return True
+        """Return whether or not a request has been stored"""
+        for index, response in self._responses(request):
+            if self.play_counts[index] == 0:
+                return True
         return False

vcr/config.py

@@ -12,7 +12,7 @@ from . import filters
 class VCR(object):
 
     def __init__(self, serializer='yaml', cassette_library_dir=None,
-                 record_mode="once", filter_headers=(),
+                 record_mode="once", filter_headers=(), custom_patches=(),
                  filter_query_parameters=(), before_record_request=None,
                  before_record_response=None, ignore_hosts=(),
                  match_on=('method', 'scheme', 'host', 'port', 'path', 'query',),
@@ -43,6 +43,7 @@ class VCR(object):
         self.before_record_response = before_record_response
         self.ignore_hosts = ignore_hosts
         self.ignore_localhost = ignore_localhost
+        self._custom_patches = tuple(custom_patches)
 
     def _get_serializer(self, serializer_name):
         try:
@@ -68,6 +69,9 @@ class VCR(object):
     def use_cassette(self, path, with_current_defaults=False, **kwargs):
         if with_current_defaults:
             return Cassette.use(path, self.get_path_and_merged_config(path, **kwargs))
+        # This is made a function that evaluates every time a cassette is made so that
+        # changes that are made to this VCR instance that occur AFTER the use_cassette
+        # decorator is applied still affect subsequent calls to the decorated function.
         args_getter = functools.partial(self.get_path_and_merged_config, path, **kwargs)
         return Cassette.use_arg_getter(args_getter)
 
@@ -86,7 +90,8 @@ class VCR(object):
             'match_on': self._get_matchers(matcher_names),
             'record_mode': kwargs.get('record_mode', self.record_mode),
             'before_record_request': self._build_before_record_request(kwargs),
-            'before_record_response': self._build_before_record_response(kwargs)
+            'before_record_response': self._build_before_record_response(kwargs),
+            'custom_patches': self._custom_patches + kwargs.get('custom_patches', ())
         }
         return path, merged_config
 

vcr/matchers.py

@@ -38,16 +38,16 @@ def headers(r1, r2):
     return r1.headers == r2.headers
 
 
-def _log_matches(matches):
+def _log_matches(r1, r2, matches):
     differences = [m for m in matches if not m[0]]
     if differences:
         log.debug(
-            'Requests differ according to the following matchers: ' +
-            str(differences)
+            "Requests {0} and {1} differ according to "
+            "the following matchers: {2}".format(r1, r2, differences)
         )
 
 
 def requests_match(r1, r2, matchers):
     matches = [(m(r1, r2), m) for m in matchers]
-    _log_matches(matches)
+    _log_matches(r1, r2, matches)
     return all([m[0] for m in matches])

vcr/patch.py

@@ -59,7 +59,9 @@ class CassettePatcherBuilder(object):
     def _build_patchers_from_mock_triples_decorator(function):
         @functools.wraps(function)
         def wrapped(self, *args, **kwargs):
-            return self._build_patchers_from_mock_triples(function(self, *args, **kwargs))
+            return self._build_patchers_from_mock_triples(
+                function(self, *args, **kwargs)
+            )
         return wrapped
 
     def __init__(self, cassette):
@@ -67,9 +69,12 @@ class CassettePatcherBuilder(object):
         self._class_to_cassette_subclass = {}
 
     def build(self):
-        return itertools.chain(self._httplib(), self._requests(),
-                               self._urllib3(), self._httplib2(),
-                               self._boto())
+        return itertools.chain(
+            self._httplib(), self._requests(), self._urllib3(), self._httplib2(),
+            self._boto(), self._build_patchers_from_mock_triples(
+                self._cassette.custom_patches
+            )
+        )
 
     def _build_patchers_from_mock_triples(self, mock_triples):
         for args in mock_triples:
@@ -86,6 +91,17 @@ class CassettePatcherBuilder(object):
                                      replacement_class))
 
     def _recursively_apply_get_cassette_subclass(self, replacement_dict_or_obj):
+        """One of the subtleties of this class is that it does not directly
+        replace HTTPSConnection with VCRRequestsHTTPSConnection, but a
+        subclass of this class that has cassette assigned to the
+        appropriate value. This behavior is necessary to properly
+        support nested cassette contexts
+
+        This function exists to ensure that we use the same class
+        object (reference) to patch everything that replaces
+        VCRRequestHTTP[S]Connection, but that we can talk about
+        patching them with the raw references instead.
+        """
         if isinstance(replacement_dict_or_obj, dict):
             for key, replacement_obj  in replacement_dict_or_obj.items():
                 replacement_obj = self._recursively_apply_get_cassette_subclass(
@@ -134,6 +150,7 @@ class CassettePatcherBuilder(object):
             (cpool, 'VerifiedHTTPSConnection', VCRRequestsHTTPSConnection),
             (cpool, 'HTTPConnection', VCRRequestsHTTPConnection),
             (cpool, 'HTTPSConnection', VCRRequestsHTTPSConnection),
+            (cpool, 'is_connection_dropped', mock.Mock(return_value=False)),  # Needed on Windows only
             (cpool.HTTPConnectionPool, 'ConnectionCls', VCRRequestsHTTPConnection),
             (cpool.HTTPSConnectionPool, 'ConnectionCls', VCRRequestsHTTPSConnection),
         )
@@ -234,7 +251,7 @@ class ConnectionRemover(object):
     def __exit__(self, *args):
         for pool, connections in self._connection_pool_to_connections.items():
             readd_connections = []
-            while not pool.pool.empty() and connections:
+            while pool.pool and not pool.pool.empty() and connections:
                 connection = pool.pool.get()
                 if isinstance(connection, self._connection_class):
                     connections.remove(connection)
@@ -273,8 +290,9 @@ def reset_patchers():
         yield mock.patch.object(cpool, 'VerifiedHTTPSConnection', _VerifiedHTTPSConnection)
         yield mock.patch.object(cpool, 'HTTPConnection', _HTTPConnection)
         yield mock.patch.object(cpool, 'HTTPSConnection', _HTTPSConnection)
-        yield mock.patch.object(cpool.HTTPConnectionPool, 'ConnectionCls', _HTTPConnection)
-        yield mock.patch.object(cpool.HTTPSConnectionPool, 'ConnectionCls', _HTTPSConnection)
+        if hasattr(cpool.HTTPConnectionPool, 'ConnectionCls'):
+            yield mock.patch.object(cpool.HTTPConnectionPool, 'ConnectionCls', _HTTPConnection)
+            yield mock.patch.object(cpool.HTTPSConnectionPool, 'ConnectionCls', _HTTPSConnection)
 
     try:
         import httplib2 as cpool

vcr/serializers/jsonserializer.py

@@ -11,10 +11,14 @@ def deserialize(cassette_string):
 def serialize(cassette_dict):
     try:
         return json.dumps(cassette_dict, indent=4)
-    except UnicodeDecodeError:
+    except UnicodeDecodeError as original:
         raise UnicodeDecodeError(
-            "Error serializing cassette to JSON. ",
-            "Does this HTTP interaction contain binary data? ",
-            "If so, use a different serializer (like the yaml serializer) ",
-            "for this request"
+            original.encoding,
+            b"Error serializing cassette to JSON",
+            original.start,
+            original.end,
+            original.args[-1] +
+            ("Does this HTTP interaction contain binary data? "
+             "If so, use a different serializer (like the yaml serializer) "
+             "for this request?")
         )

vcr/stubs/__init__.py

@@ -76,7 +76,7 @@ class VCRHTTPResponse(HTTPResponse):
         self._closed = False
 
         headers = self.recorded_response['headers']
-        self.msg = parse_headers(headers)
+        self.headers = self.msg = parse_headers(headers)
 
         self.length = compat.get_header(self.msg, 'content-length') or None
 
@@ -217,11 +217,15 @@ class VCRConnection(object):
             response = self.cassette.play_response(self._vcr_request)
             return VCRHTTPResponse(response)
         else:
-            if self.cassette.write_protected and self.cassette.filter_request(self._vcr_request):
+            if self.cassette.write_protected and self.cassette.filter_request(
+                self._vcr_request
+            ):
                 raise CannotOverwriteExistingCassetteException(
+                    "No match for the request (%r) was found. "
                     "Can't overwrite existing cassette (%r) in "
                     "your current record mode (%r)."
-                    % (self.cassette._path, self.cassette.record_mode)
+                    % (self._vcr_request, self.cassette._path,
+                       self.cassette.record_mode)
                 )
 
             # Otherwise, we should send the request, then get the response
@@ -232,12 +236,16 @@ class VCRConnection(object):
                     self._vcr_request
                 )
             )
-            self.real_connection.request(
-                method=self._vcr_request.method,
-                url=self._url(self._vcr_request.uri),
-                body=self._vcr_request.body,
-                headers=self._vcr_request.headers,
-            )
+            # This is imported here to avoid circular import.
+            # TODO(@IvanMalison): Refactor to allow normal import.
+            from vcr.patch import force_reset
+            with force_reset():
+                self.real_connection.request(
+                    method=self._vcr_request.method,
+                    url=self._url(self._vcr_request.uri),
+                    body=self._vcr_request.body,
+                    headers=self._vcr_request.headers,
+                )
 
             # get the response
             response = self.real_connection.getresponse()
@@ -310,3 +318,4 @@ class VCRHTTPSConnection(VCRConnection):
     '''A Mocked class for HTTPS requests'''
     _baseclass = HTTPSConnection
     _protocol = 'https'
+    is_verified = True