nginx location based reverse proxy

services.conf

upstream serviceA {
  server 127.0.0.1:88;
  server 127.0.0.1:88;
}
upstream serviceB {
  server 127.0.0.1:89;
  server 127.0.0.1:89;
}
upstream serviceC {
  server 127.0.0.1:90;
  server 127.0.0.1:90;
}
server {
  listen       80;
  # your public server name here
  server_name  127.0.0.1;
  # proxy to Apache 2
  location / {
    proxy_redirect     off;
    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_max_temp_file_size 0;
    #more here ...
  }
  location /serviceA/ {
    proxy_pass         http://serviceA/;
  }
  location /serviceB/ {
    proxy_pass         http://serviceB/;
  }
  location /serviceC/ {
    proxy_pass         http://serviceC/;
  }
}