This is the expected behavior. By default, Fiddler buffers request and response traffic. Although, Audio/Video response traffic is streamed automatically.
The reason the problem disappears is the oSession.bBufferResponse flag is forcing all response traffic to buffer and by commenting the flag, this allows it to stream. Note that streamed requests and responses cannot be modified using Fiddler Inspectors.
To determine whether a given response was streamed, test the Session's BitFlags using the following code in the OnBeforeResponse event.
bool bWasStreamed = oSession.isFlagSet(SessionFlags.ResponseStreamed);
I hope this helps. Please let me know if you need any additional information. Thank you.
Eric R | Technical Support Engineer
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