nginx.conf

worker_processes auto;

 events {
     worker_connections 2048;
     use epoll;
 }

 http {
     sendfile on;
     access_log off;
     error_log off;

     upstream api01 {
         server api01:8080;
     }

     upstream api02 {
         server api02:8080;
     }

     upstream api {
         server api01:8080;
         server api02:8080;
     }

     map $uri $api {
         default api;
         ~/clientes/[13579]+ api01;
         ~/clientes/[02468]+ api02;
     }

     server {
         listen 9999;
         location / {
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
             proxy_pass http://$api;
         }
     }
 }