How to use nginx variables

How to use Nginx variables

What are Nginx variables?

Nginx variables are space placeholders that store specific information or values, used to dynamically generate text in Nginx configuration.

How to use Nginx variables?

To use an Nginx variable, use the dollar sign ($) followed by the variable name:

 <code>$variable_name</code>

Commonly used Nginx variables:

• $arg_variable_name: Extract URL parameters from request
• $host: The requested host name
• $http_host: Requested HTTP host header
• $method: Request method (such as GET, POST)
• $remote_addr: The IP address of the client
• $request_uri: The requested URI
• $server_name: Server name
• $time_local: Current server time (local time)

Example of usage:

The following example uses the $remote_addr variable to record the IP address of the client in the access log:

 <code>access_log /var/log/nginx/access.log $remote_addr;</code>

Other usage scenarios:

• Redirect requests based on request hostname
• Customize responses for different clients
• Record request information for debugging or analysis

Notice:

• Make sure the variable name is correct.
• Use backslash() when you need to escape special characters such as dollar signs.
• It is recommended to use a test environment to test variable usage.

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