USING NPH SCRIPTS

NPH, or ``no-parsed-header'', scripts bypass the server completely by sending the complete HTTP header directly to the browser. This has slight performance benefits, but is of most use for taking advantage of HTTP extensions that are not directly supported by your server, such as server push and PICS headers.

Servers use a variety of conventions for designating CGI scripts as NPH. Many Unix servers look at the beginning of the script's name for the prefix ``nph-''. The Macintosh WebSTAR server and Microsoft's Internet Information Server, in contrast, try to decide whether a program is an NPH script by examining the first line of script output.

CGI.pm supports NPH scripts with a special NPH mode. When in this mode, CGI.pm will output the necessary extra header information when the header and redirect methods are called.

The Microsoft Internet Information Server requires NPH mode. As of version 2.30, CGI.pm will automatically detect when the script is running under IIS and put itself into this mode. You do not need to do this manually, although it won't hurt anything if you do.

There are a number of ways to put CGI.pm into NPH mode:

In the use statement Simply add ":nph" to the list of symbols to be imported into your script: 
      use CGI qw(:standard :nph)

By calling the nph() method:
Call nph() with a non-zero parameter at any point after using CGI.pm in your program. 

      CGI->nph(1)

By using -nph parameters in the header() and redirect() statements: 
      print $q->header(-nph=>1);