Why POST methos is not work?

[Monty Ree]

Hello, all.

I have setup vcl like below, and works well except POST method.
When I using POST Method like writing a message, the site is stops and 
trying to connect the backend server continuously.
and I have restarted the varnishd but the result is same.

What's the problem and is there any problem at this config?

====================================================================

backend server1 {
         set backend.host = "origin.abc.com";
         set backend.port = "80";
}


sub vcl_recv {
    if (req.http.Host == "www.abc.com")
     {
         set req.backend = server1;
         set req.http.host = "origin.abc.com";

     }
       if (req.request == "POST") {
                     pipe;
             }
        if (req.request == "GET" && req.http.cookie) {
                 lookup;
             }
        if (req.http.Authenticate) {
                  pipe;
                }

         if (req.url ~ "\.cgi|php)$") {
                  pipe;
                }

          if (req.url ~ "\.(pdf|png|gif|jpg|mp3|svf)$") {
                   lookup;
                }
        
        }

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