chloe88 commented on issue #4942:
URL: https://github.com/apache/apisix/issues/4942#issuecomment-908970428


   the  response is not processed by the gateway (apisix).
   
   See the nginx conf
   
    ### the following x-forwarded-* headers is to send to upstream server
   
               set $var_x_forwarded_for        $remote_addr;
               set $var_x_forwarded_proto      $scheme;
               set $var_x_forwarded_host       $host;
               set $var_x_forwarded_port       $server_port;
   
               if ($http_x_forwarded_for != "") {
                   set $var_x_forwarded_for "${http_x_forwarded_for}, 
${realip_remote_addr}";
               }
               if ($http_x_forwarded_proto != "") {
                   set $var_x_forwarded_proto $http_x_forwarded_proto;
               }
               if ($http_x_forwarded_host != "") {
                   set $var_x_forwarded_host $http_x_forwarded_host;
               }
               if ($http_x_forwarded_port != "") {
                   set $var_x_forwarded_port $http_x_forwarded_port;
               }
   
               proxy_set_header   X-Forwarded-For      $var_x_forwarded_for;
               proxy_set_header   X-Forwarded-Proto    $var_x_forwarded_proto;
               proxy_set_header   X-Forwarded-Host     $var_x_forwarded_host;
               proxy_set_header   X-Forwarded-Port     $var_x_forwarded_port;
   
   
   so you can add some header to the previous proxy. set the   X-Forwarded-Port 
to 80 to  resolve it
   
   


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