Proxy headers forwarding in Nginx - Mini Project: Build & Apply

Proxy Headers Forwarding with Nginx

📖 Scenario: You are setting up a web server using Nginx as a reverse proxy. Your goal is to forward specific HTTP headers from the client to the backend server to preserve client information.

🎯 Goal: Configure Nginx to forward the X-Real-IP and X-Forwarded-For headers to the backend server.

📋 What You'll Learn

Create a basic Nginx server block listening on port 80

Set the backend server URL as http://backend.local

Add proxy headers X-Real-IP and X-Forwarded-For forwarding

Print the final Nginx configuration to verify the headers forwarding

💡 Why This Matters

🌍 Real World

In real websites, Nginx often acts as a reverse proxy. Forwarding headers like <code>X-Real-IP</code> helps backend servers log and respond based on the actual client IP, not the proxy's IP.

💼 Career

Understanding proxy headers is essential for DevOps roles managing web servers and load balancers to ensure accurate client information is preserved and security policies are correctly applied.

1

Create basic Nginx server block

Create an Nginx server block listening on port 80 with a location / that proxies requests to http://backend.local. Name the server block server.

Nginx

# Your code here

Need a hint?

Use listen 80; inside server { } and proxy_pass http://backend.local; inside location / { }.

2

Add proxy header for X-Real-IP

Inside the location / block, add the line proxy_set_header X-Real-IP $remote_addr; to forward the client's real IP address.

Nginx

server {
    listen 80;
    location / {
        proxy_pass http://backend.local;
        # Add proxy_set_header for X-Real-IP below
    }
}

Need a hint?

Use proxy_set_header X-Real-IP $remote_addr; inside the location / block.

3

Add proxy header for X-Forwarded-For

Inside the location / block, add the line proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; to forward the chain of client IP addresses.

Nginx

server {
    listen 80;
    location / {
        proxy_pass http://backend.local;
        proxy_set_header X-Real-IP $remote_addr;
        # Add proxy_set_header for X-Forwarded-For below
    }
}

Need a hint?

Use proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; inside the location / block.

4

Print the final Nginx configuration

Print the complete Nginx server block configuration to verify the proxy headers forwarding.

Nginx

# Print the Nginx configuration below
# Your code here

Need a hint?

Use a print statement to display the full configuration as shown.