Ensure body is consumed only once

Fixes: #846
Signed-off-by: Mathieu Parent <[email protected]>

vcr/stubs/__init__.py

@@ -252,6 +252,11 @@ def endheaders(self, message_body=None):
 
     def getresponse(self, _=False, **kwargs):
         """Retrieve the response"""
+        # Some file-like objects or iterators can only be consumed once
+        if hasattr(self._vcr_request.body, 'read'):
+            self._vcr_request.body = self._vcr_request.body.read()
+        elif not isinstance(self._vcr_request.body, (str, bytes, bytearray, list)):
+            self._vcr_request.body = list(self._vcr_request.body)
         # Check to see if the cassette has a response for this request. If so,
         # then return it
         if self.cassette.can_play_response_for(self._vcr_request):