Why reverse proxying serves backend applications in Nginx - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the server listening on port 80.

Nginx

server {
    listen [1];
    server_name example.com;
}

Drag options to blanks, or click blank then click option'

A80

B443

C22

D8080

Attempts:

3 left

💡 Hint

Common Mistakes

Using port 443 without SSL configuration

Using SSH port 22 instead of HTTP port

The listen directive sets the port where Nginx listens for incoming requests. Port 80 is the default for HTTP.

2fill in blank

medium

Complete the code to forward requests to the backend server at localhost port 3000.

Nginx

location / {
    proxy_pass http://[1];
}

Drag options to blanks, or click blank then click option'

A127.0.0.1:80

Blocalhost:22

C127.0.0.1:3000

D192.168.1.1:3000

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port number

Using external IP instead of localhost

The proxy_pass directive forwards requests to the backend server. Here, the backend runs on localhost at port 3000.

3fill in blank

hard

Fix the error in the proxy_pass directive to correctly forward to backend.

Nginx

location /api/ {
    proxy_pass http://127.0.0.1[1]3000/;
}

Drag options to blanks, or click blank then click option'

A.

B/

C;

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using slash instead of colon between IP and port

Omitting the port separator

The port number must be separated from the IP by a colon :. Without it, the address is invalid.

4fill in blank

hard

Fill both blanks to set headers that preserve the original client IP and host.

Nginx

location / {
    proxy_set_header [1] $remote_addr;
    proxy_set_header [2] $host;
}

Drag options to blanks, or click blank then click option'

AX-Real-IP

BHost

CX-Forwarded-For

DServer-Name

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect header names

Not setting headers to preserve client info

X-Real-IP forwards the client's IP address, and Host preserves the original host header.

5fill in blank

hard

Fill both blanks to create a reverse proxy that listens on port 80, forwards to backend at 5000, and sets the correct headers.

Nginx

server {
    listen [1];
    location / {
        proxy_pass http://127.0.0.1:5000;
        proxy_set_header [2] $remote_addr;
    }
}

Drag options to blanks, or click blank then click option'

A80

B:

CX-Real-IP

D443

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port in listen directive

Missing colon between IP and port

Not setting client IP header

This configuration listens on port 80, forwards requests to backend at port 5000, and sets X-Real-IP header to pass client IP.