how create new POST request with C#?

[Max]

Hello, please tell me how to create a separate POST request using the C# language.
Initially, I tried to change the outgoing POST request from another application and resend it, but I get an error - "HTTP/1.1 504 Fiddler - Receive Failure".
And now you need to write a new request, specifying the headers and receiving a response.
And the whole question is how to do it all in C#?

I tried to use this code

 

    public static void OnBeforeResponse(Session oSession)
        {
           
        
            if (oSession.HTTPMethodIs("POST") ) 
            { 
    
    
                  String strBody =  oSession.GetRequestBodyAsString(); 
     
                  oSession.host="api.123.com";
      
                    string resultRequest = "request";
   
    
                    byte[] resulByte =   System.Text.Encoding.ASCII.GetBytes(resultRequest);
    
                
                    FiddlerApplication.oProxy.SendRequest (oSession.RequestHeaders, resulByte, null);            
    
               }

[Nick Iliev]

The error 504 indicates that the request was received from the server but then was dropped for some reason, and no information was sent back. The reason might vary - it could be that the server expects a specific header or information or that the IP is not allowed (or other security techniques). There might also be a temporary issue with the server (server down or problematic connection).

Refer to this forum thread for other possible reasons and troubleshoot ideas related to this kind of error message.