Proxy headers in Nginx - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the original client's IP address in the proxy headers.

Nginx

proxy_set_header X-Real-IP [1];

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

A$http_user_agent

B$host

C$remote_addr

D$server_addr

Attempts:

3 left

💡 Hint

Common Mistakes

Using $host instead of $remote_addr causes the backend to see the server's hostname, not the client IP.

Using $server_addr sends the server's IP, not the client's.

The X-Real-IP header should be set to $remote_addr to pass the client's IP address to the backend server.

2fill in blank

medium

Complete the code to forward the original Host header to the backend server.

Nginx

proxy_set_header Host [1];

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

A$host

B$remote_addr

C$server_name

D$http_referer

Attempts:

3 left

💡 Hint

Common Mistakes

Using $remote_addr sends the client IP instead of the host.

Using $server_name sends the server's configured name, not the client's requested host.

The Host header should be set to $host to preserve the original host requested by the client.

3fill in blank

hard

Fix the error in the code to correctly set the X-Forwarded-For header to include the client IP and existing forwarded IPs.

Nginx

proxy_set_header X-Forwarded-For [1];

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

A$http_x_forwarded_for

B$server_addr

C$remote_addr

D$proxy_add_x_forwarded_for

Attempts:

3 left

💡 Hint

Common Mistakes

Using $remote_addr overwrites the existing forwarded IPs.

Using $http_x_forwarded_for alone does not add the current client IP.

The variable $proxy_add_x_forwarded_for appends the client IP to the existing X-Forwarded-For header, preserving the chain of IPs.

4fill in blank

hard

Fill both blanks to set headers that forward the original protocol and client IP to the backend.

Nginx

proxy_set_header X-Forwarded-Proto [1];
proxy_set_header X-Real-IP [2];

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

A$scheme

B$remote_addr

C$host

D$server_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using $host for X-Forwarded-Proto is incorrect.

Using $server_name for X-Real-IP sends the server name, not client IP.

X-Forwarded-Proto should be set to $scheme to indicate HTTP or HTTPS. X-Real-IP should be set to $remote_addr to pass the client IP.

5fill in blank

hard

Fill all three blanks to set headers that forward the original host, protocol, and client IP to the backend.

Nginx

proxy_set_header Host [1];
proxy_set_header X-Forwarded-Proto [2];
proxy_set_header X-Real-IP [3];

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

A$remote_addr

B$scheme

C$host

D$server_name

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up $server_name and $host.

Using $remote_addr for Host header.

Using $host for X-Real-IP.

Set Host to $host to preserve the original host. Set X-Forwarded-Proto to $scheme to indicate the protocol. Set X-Real-IP to $remote_addr to forward the client IP.