How to Setup Nginx Reverse Proxy

How to use Nginx as a reverse proxy server

You can configure Nginx as a proxy server using the code snippet below. You’ll set up a server block for your domain and specify a location to the backend server where Nginx should send incoming requests.

server {
    listen 80;
    server_name example.com;

    location /backend_app {
       proxy_pass http://127.0.0.1:8080;
    }
}

The configuration above tells Nginx to pass all requests to the /backdend_app location to the proxied server at http://127.0.0.1:8080.

For instance, if a client requests http://example.com/backend_app, Nginx will forward those requests to the backend server defined on the proxy_pass line: http://127.0.0.1:8080.

While that basic configuration shows the fundamentals, Nginx can do much more with proxy servers. For instance, proxy servers can also handle requests for non-HTTP servers like these:

• fastcgi_pass – reverse proxy to a FastCGI server.
• uwsgi_pass – reverse proxy to a uwsgi server.
• scgi_pass – reverse proxy to an SCGI server.

A common Nginx reverse proxy to non-HTTP hosts is done using PHP-FPM. An example is how Nginx serves PHP scripts.

server {

    # ... other server block configs

    location ~ .php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.4-fpm.sock;
    }
}

How to configure Nginx reverse proxy options

Reverse proxy servers have common options that define how requests are handled and served to the backend servers or apps. These configuration options are recommended when using Nginx as a proxy. In most cases, these headers and parameters will work across all environments where Nginx is deployed as a reverse proxy.

 location/ {
    proxy_pass http://127.0.0.1:8080;
    proxy_http_version  1.1;
    proxy_cache_bypass  $http_upgrade;

    proxy_set_header Upgrade           $http_upgrade;
    proxy_set_header Connection        "upgrade";
    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_set_header X-Forwarded-Host  $host;
    proxy_set_header X-Forwarded-Port  $server_port;
  }

You can visit the Nginx site for more options to use in your environment.

That should wrap things up!

Conclusion:

Setting up Nginx as a reverse proxy server can significantly enhance the efficiency and performance of your web applications. Here are the key takeaways:

• Flexibility: Nginx can handle both HTTP and non-HTTP requests, making it suitable for various backend applications.
• Efficiency: It offloads the processing from backend servers, managing tasks like SSL encryption and caching.
• Scalability: Load balancing features help distribute client requests efficiently across multiple servers, improving performance.
• Customizability: Nginx’s configuration options allow you to tailor the reverse proxy settings to meet your specific needs.
• Support for Modern Applications: Use Nginx with popular backend technologies like Node.js, Python, and PHP.

By following the basic configurations and using the options discussed, you can effectively implement Nginx as a reverse proxy in your environment.