When creating a "HTTP response headers" rule on a Domino server there is an option for "Customer Header". The description of this field says:
(HTTP Response Header only) For each custom header you want to use, specify:
"Name" - files in the directory are displayed in the browser or downloaded.
"Value" - files in the directory are CGI files to be executed on the server.
"Override" - (override application's header)
In the "Value" field it says something about CGI, so my question is:
Is it possible to add some CGI variable or script in this value field or do it only accepts pure strings?
The code will be served AS TEXT by the server, the server will not execute it.
I guessed you've been fooled by the CGI term: it does not means that on server side a program (your code) will run.