allow match_on to be passed as an argument VCR

tests/integration/test_config.py

@@ -34,3 +34,14 @@ def test_override_set_cassette_library_dir(tmpdir):
 
     assert os.path.exists(str(tmpdir.join('subdir2').join('test.json')))
     assert not os.path.exists(str(tmpdir.join('subdir').join('test.json')))
+
+
+def test_override_match_on(tmpdir):
+    my_vcr = vcr.VCR(match_on=['method'])
+
+    with my_vcr.use_cassette(str(tmpdir.join('test.json'))) as cass:
+        urllib2.urlopen('http://httpbin.org/')
+        urllib2.urlopen('http://httpbin.org/get')
+
+    assert len(cass) == 1
+    assert cass.play_count == 1

vcr/config.py

@@ -8,9 +8,11 @@ class VCR(object):
     def __init__(self,
                  serializer='yaml',
                  cassette_library_dir=None,
-                 record_mode="once"):
+                 record_mode="once",
+                 match_on=['url','method'],
+                 ):
         self.serializer = serializer
-        self.match_on = ['url', 'method']
+        self.match_on = match_on
         self.cassette_library_dir = cassette_library_dir
         self.serializers = {
             'yaml': yamlserializer,