The request should contain the 'Content-Encoding: gzip' header. Then Fiddler would recognize it and if the 'Decode' button on the toolbar is pressed, Fiddler would decode the request automatically. If the 'Decode' button is not pressed, Fiddler will show a 'Request body is encoded. Click to decode.' button, which decodes the request on click.
Regards,
Simeon
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