cgi is more than parsing query strings, there are at least two other variable passing mechanisms x-www-form-encoded (query string as the POST body) and multipart/form-data - the sort that's required when uploading binary stuff.

Common Gateway Interface is a 36 page RFC : http://www.ietf.org/rfc/rfc3875

My form upload decoder is here if anyone is interested
http://www.proweb.co.uk/~matt/werc/cgilib.rc:35

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