nginx.tmpl

### proxy to Gateway, adding CORS 
events { }

http {
  server {
    listen $PORT; 
    server_name proxy_to_gw; 
    location / {
      if ($request_method = 'OPTIONS') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Credentials' 'true';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS'; 
        add_header 'Access-Control-Allow-Headers' 'Origin,Accept,Content-Type'; 
        add_header 'Access-Control-Max-Age' 1728000;
        add_header 'Content-Type' 'text/plain charset=UTF-8';
        add_header 'Content-Length' 0;
        return 204;
      } 
      if ($request_method = 'GET') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Credentials' 'true';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'Origin,Accept,Content-Type';
      } 
      proxy_pass https://api-na.hosted.exlibrisgroup.com;
      proxy_set_header Host $host;
      proxy_set_header Authorization "apikey ${ALMA_API_KEY}"; 
      proxy_set_header Accept "application/json";
      proxy_set_header X-Real-IP $remote_addr;
    }  
  }
}