I have not seen any reference to "nph" in :
http://info.cern.ch/hypertext/WWW/Daemon/User/CGIBinDoc.html
> Results From Scripts
>
> Scripts return their results either outputting a document to their standard output, or by
> outputting the location of the result document (either a full URL or a local virtual
> path).
>
> Outputting a Document
>
> Script result must begin with a Content-Type: line giving the document content
> type, followed by an empty line. The actual document follows the empty line.
> Example:
>
> Content-Type: text/html
>
> <HEAD>
> <TITLE>Script test>
> </HEAD>
> <BODY>
> <H1>My First Virtual Document</H1>
> ....
> </BODY>
>
> Giving Document Location
>
> If the script wants to return an existing document (local or remote), it can give a
> Location: header followed by an empty line: Example:
>
.................................
Guy Decoux