Ensure body is consumed only once

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

vcr/stubs/__init__.py

@@ -254,6 +254,12 @@ def getresponse(self, _=False, **kwargs):
         """Retrieve the response"""
         # Check to see if the cassette has a response for this request. If so,
         # then return it
+        if self._vcr_request.headers.get('Transfer-Encoding', '') == 'chunked':
+            if not (isinstance(self._vcr_request.body, str) or isinstance(self._vcr_request.body, bytes) or isinstance(self._vcr_request.body, bytearray)):
+                if hasattr(self._vcr_request.body, 'read'):
+                    self._vcr_request.body = self._vcr_request.body.read()
+                else:
+                    self._vcr_request.body = list(self._vcr_request.body)
         if self.cassette.can_play_response_for(self._vcr_request):
             log.info(f"Playing response for {self._vcr_request} from cassette")
             response = self.cassette.play_response(self._vcr_request)