CGI Programming Interview Question:

Can I run a CGI script without returning a new page to the browser?

Submitted by: Administrator

Yes, but think carefully first: How are your readers going to know
that their "submit" has succeeded? They may hit 'submit' many times!

The correct solution according to the HTTP specification is to
return HTTP status code 204. As an NPH script, this would be:

#!/bin/sh
# do processing (or launch it as background job)
echo "HTTP/1.0 204 No Change"
echo
Submitted by: Administrator