how to config rest service with parameter in nginx

I am configuring rest and soap services in nginx. Soap service is working fine but for rest srvices its giving error 404 not found.In rest service I have parameter which is the problem.here is the config file for REST

events {}
http {
   default_type application/octet-stream;
    sendfile on;
    keepalive_timeout 65;
      charset utf-8;
    upstream backendserver {
    
        
        server 112.000.0.111:8000  backup;
        server 11.000.3.112:8000 max_fails=3 fail_timeout=180s ;
        
        keepalive 64;
    }
    server {
    listen 8000;
    include api_conf.d/*.conf;

        }
  location/services/ert/api/potentialvalue(.*)$ {
  limit_except GET {
                 deny all;
             }
       proxy_pass http://backendserver/