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Editorial Team
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Asked: 2026-05-23T13:42:49+00:00

Great tool, does everything I need. Love its Transform tab that allows compression of

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Great tool, does everything I need. Love its Transform tab that allows compression of the response. But what about request? Seems like a simple thing but I don’t see that functionality. Am I missing something?

Fiddler Web Debugger, V2.3.4.4.

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1 Answer

  1. Editorial Team

    You can write a bit of script to compress the request body. Click Rules > Customize Rules, and add something like this:

    static function OnBeforeRequest(oSession: Session){
  if (oSession.requestBodyBytes != null && oSession.requestBodyBytes.Length>0){
    oSession.requestBodyBytes = Utilities.GzipCompress(oSession.requestBodyBytes);
    oSession["Content-Length"] = oSession.requestBodyBytes.Length.ToString();
    oSession["Content-Encoding"] = "gzip";
  }

    However, I’m not aware of any servers that actually support compressed requests. There’s no good way for a server to signal that it supports compressed requests, and Zip Bomb attacks are a real threat for servers.

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