apiasp.net-corepostmanidentityserver3

Postman Bad Request - Request Too Long

I am using Asp.Net Core 3.1 API with Identity Server and I am using Postman as an API tester from long time and it is working perfect, but, after version update to 8.+.+ the Postman return me this error:

<HEAD>
    <TITLE>Bad Request</TITLE>
    <META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii">
</HEAD>

<BODY>
    <h2>Bad Request - Request Too Long</h2>
    <hr>
    <p>HTTP Error 400. The size of the request headers is too long.</p>
</BODY>

I putted in header key (Content-Type) and the value (application/json) and authorization is in type of bearer token with empty body.

I followed many questions to solve this issue like the bellow mentioned:

How can I solve Postman (Bad Request - Request Too Long) issue?

Solution

  • After many research, it is very easy and simple way to delete the cookies from the Postman application as shown below:

    Cookies location

    Then delete the cookies as shown below:

    Delete cookies

    Now try to apply the request, it should work, but, this is only temporary solution, I hope there is a full solution from Postman team or someone.