Mobile apps, such as NBC News on Android, access resources that have responses which are encoded with Content-Type: application/x-zip-compressed. Try it out using this URL from a browser. http://data.nbcnews.com/drone/api/query/devices/nbcnews_android/5.10.5/prod_assets It would be convenient to have Fiddler offer to decompress this content, just like what it does for gzip