By default Fiddler buffers Requests and Responses. Additionally, the 2 GB setting is because .NET is unable to buffer Arrays of that size. In this case, streamed Requests and Responses are used as to resolve this.
With that said, only audio and video Responses are configured to stream by default. Although, streamed Responses cannot be modified using Fiddler's Inspectors.
I hope this helps. Please let me know if you need any additional information. Thank you for using the Fiddler Forums.
Eric R | Technical Support Engineer
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