Decompress gzip content removes the content

4 posts, 0 answers
  1. M
    M avatar
    1 posts
    Member since:
    Jan 2014

    Posted 20 Oct 2014 Link to this post

    Hi Eric -- Thx a lot for a great product and I have been using this close to a decade. 

    I have seen this issue and I thought try to figure out what's going on, is this a bug or a somekind of security feature that this page invented (sorry this shows up in one of the application and am not able to get you the direct url, so I thought capture it -- but I can save the response if you want). Thx.

  2. Eric Lawrence
    Eric Lawrence avatar
    832 posts

    Posted 20 Oct 2014 Link to this post

    Cool! This looks like a bug in Fiddler's decompression code or a 3rd party library; I'd love to have a look and fix it. Please use File > Save Session Archive to save the session that exhibits this behavior, and attach the .SAZ file to an email you send to me using Help > Send Feedback.

    thanks a bunch!

    Eric Lawrence

    Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.

  3. Kurt
    Kurt avatar
    3 posts
    Member since:
    May 2015

    Posted 11 Oct 2016 Link to this post

    Hey, Eric

    I'm having a similar problem with a specific website.   The web request is proprietary (API) and includes client credentials so I can't really post it here.

    When I send the request to the url via a .NET application, it communicates fine, receives the result and displays it to me without any issue.  However when I attempt to view the response data through Fiddler, I am prompted with the following message:

    "Fiddler: UnGZip failed

    The content could not be decompressed.

    The magic number in GZip header is not correct. Make sure you are passing in a GZip stream"

    This is on latest version of Fiddler (

    I have talked to the developer of the website, and they have suggested they are setting some headers improperly, but aren't sure how to fix on their end.  I'm not sure what the issue is exactly.  Is there a way to "relax" the error checking on the GZip in the same way that allows .NET and web browsers to load the content fine without any errors?


    ~ Kurt

  4. zohaib
    zohaib avatar
    3 posts
    Member since:
    May 2012

    Posted 3 days and 2 hours ago Link to this post

    The content could not be decompressed.
    The magic number in GZip header is not correct. make sure you passing ini a GZip stream.


    Any solution of this problem ? 

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