I don't think you are going to be abe to do it for just one step of a script, unless the url is unique and predictable at the step. Untested but I believe should work for apache 1.3+ for an entire script.

SetEnvIf Request_URI "path/to/yourscript.pl$" force-response-1.0
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-Lee

"To be civilized is to deny one's nature."