Want to set proxy flag (like apache) in NGINX

In Apache

rewriterule  acution(.*)$ xyz.com$1 [P]

      

        
        
        
      

    

because of this flag, the [P]

user will only get the original IP address or domain.

In Nginx

rewrite acution(.*)$ http://xyz.com$1; 

      

        
        
        
      

    

now I want to do the same by setting the proxy flag [P]

so that the user only gets the original domain name instead of http://xyz.com .

Please indicate how to achieve the same.