mod_setenv: Lighttpd Send Custom Headers

In Lighttpd, you can use the mod_setenv module to send custom headers to the client. Here's how you can do it:

1. Enable the mod_setenv module: If the mod_setenv module is not already enabled, you'll need to enable it in your Lighttpd configuration file. Add the following line to the file:

   server.modules += ("mod_setenv")

2. Set the custom header: Once the mod_setenv module is enabled, you can set the custom header using the setenv.add-response-header option. For example, to set a custom header named "My-Custom-Header" with a value of "Custom Value", add the following line to your configuration file:

   setenv.add-response-header = ("My-Custom-Header" => "Custom Value")

   You can set multiple custom headers by adding multiple setenv.add-response-header lines to the file.

3. Restart Lighttpd: After adding the mod_setenv and setenv.add-response-header lines to your configuration file, save the file and restart Lighttpd for the changes to take effect.

   sudo service lighttpd restart

   Once Lighttpd has restarted, it will send the custom headers you specified to the client in the HTTP response.

rnNote that sending custom headers can be useful for adding extra information to the response, but it's important to make sure that the custom headers you send do not conflict with any existing HTTP standards or cause security vulnerabilities.