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Error 431 Request Header Fields Too Large

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Hi, 

 

Have a flow that was previously working (a few months ago), was idle and now when we run it we get this "Error 431 Request Headers Too Large". I have tried calling the API with Postman and everything works fine, but when we do the same request with Power Automate we get this error. 

Any general tips? I have for instance cleared cookies and checked the request with Fiddler together with MS but no concrete answers as of yet. 

 

It is triggered from a button in a Model driven app record where the GUID from the record is sent in. And does a POST call to a api with a token. And it all works in Postman with the same values/information.  

  • Kiddojazz Profile Picture
    Kiddojazz 3 on at
    Re: Error 431 Request Header Fields Too Large

    Thanks, this worked perfectly for me!!!😊

  • Verified answer
    davejust Profile Picture
    davejust 9 on at
    Re: Error 431 Request Header Fields Too Large

    I case anyone else comes here for an answer, I ran into this yesterday. There is an option in the settings of the HTTP action to "suppress workflow headers". Enabling this fixed the issue for me.

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