To send custom headers using mod_setenv in the Lighttpd web server, you will need to add a setenv.add-response-header directive to your Lighttpd configuration file. This directive allows you to specify a custom header and its value that should be included in the response sent by the server.
Here's an example of how to use setenv.add-response-header to set a custom header:
setenv.add-response-header = ( "X-Custom-Header" => "custom header value" )
You can add multiple custom headers by including multiple setenv.add-response-header directives in your configuration file. For example:
setenv.add-response-header = ( "X-Custom-Header-1" => "custom header value 1" ) setenv.add-response-header = ( "X-Custom-Header-2" => "custom header value 2" )
After you have added the setenv.add-response-header directives to your Lighttpd configuration file, you will need to restart the Lighttpd server to apply the changes. You can do this by running the following command:
systemctl restart lighttpd
Keep in mind that custom headers are just one of the many ways you can customize the behavior of the Lighttpd web server. There are many other options and modules available that can help you fine-tune the performance and functionality of your web server.