IRIX Base Documentation 2001 May/SGI IRIX Base Documentation 2001 May.iso/usr/share/catman/p_man/cat3/perl5/CGI::Fast.z/CGI::Fast

Text File | 1998-10-30 | 6.4 KB | 199 lines

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     CGI::Fast - CGI Interface for Fast CGI

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         use CGI::Fast qw(:standard);
         $COUNTER = 0;
         while (new CGI::Fast) {
             print header;
             print start_html("Fast CGI Rocks");
             print
                 h1("Fast CGI Rocks"),
                 "Invocation number ",b($COUNTER++),
                 " PID ",b($$),".",
                 hr;
             print end_html;
         }


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     CGI::Fast is a subclass of the CGI object created by CGI.pm.  It is
     specialized to work well with the Open Market FastCGI standard, which
     greatly speeds up CGI scripts by turning them into persistently running
     server processes.  Scripts that perform time-consuming initialization
     processes, such as loading large modules or opening persistent database
     connections, will see large performance improvements.

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     In order to use CGI::Fast you'll need a FastCGI-enabled Web server.  Open
     Market's server is FastCGI-savvy.  There are also freely redistributable
     FastCGI modules for NCSA httpd 1.5 and Apache.  FastCGI-enabling modules
     for Microsoft Internet Information Server and Netscape Communications
     Server have been announced.

     In addition, you'll need a version of the Perl interpreter that has been
     linked with the FastCGI I/O library.  Precompiled binaries are available
     for several platforms, including DEC Alpha, HP-UX and SPARC/Solaris, or
     you can rebuild Perl from source with patches provided in the FastCGI
     developer's kit.  The FastCGI Perl interpreter can be used in place of
     your normal Perl without ill consequences.

     You can find FastCGI modules for Apache and NCSA httpd, precompiled Perl
     interpreters, and the FastCGI developer's kit all at URL:

       http://www.fastcgi.com/


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     FastCGI scripts are persistent: one or more copies of the script are
     started up when the server initializes, and stay around until the server
     exits or they die a natural death.  After performing whatever one-time
     initialization it needs, the script enters a loop waiting for incoming
     connections, processing the request, and waiting some more.



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     A typical FastCGI script will look like this:

         #!/usr/local/bin/perl    # must be a FastCGI version of perl!
         use CGI::Fast;
         &do_some_initialization();
         while ($q = new CGI::Fast) {
             &process_request($q);
         }

     Each time there's a new request, CGI::Fast returns a CGI object to your
     loop.  The rest of the time your script waits in the call to _n_e_w().  When
     the server requests that your script be terminated, _n_e_w() will return
     undef.  You can of course exit earlier if you choose.  A new version of
     the script will be respawned to take its place (this may be necessary in
     order to avoid Perl memory leaks in long-running scripts).

     CGI.pm's default CGI object mode also works.  Just modify the loop this
     way:

         while (new CGI::Fast) {
             &process_request;
         }

     Calls to _h_e_a_d_e_r(), _s_t_a_r_t__f_o_r_m(), etc. will all operate on the current
     request.

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     See the FastCGI developer's kit documentation for full details.  On the
     Apache server, the following line must be added to srm.conf:

         AddType application/x-httpd-fcgi .fcgi

     FastCGI scripts must end in the extension .fcgi.  For each script you
     install, you must add something like the following to srm.conf:

        AppClass /usr/etc/httpd/fcgi-bin/file_upload.fcgi -processes 2

     This instructs Apache to launch two copies of file_upload.fcgi at startup
     time.

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     Any script that works correctly as a FastCGI script will also work
     correctly when installed as a vanilla CGI script.  However it will not
     see any performance benefit.

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     I haven't tested this very much.

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     be used and modified freely, but I do request that this copyright notice
     remain attached to the file.  You may modify this module as you wish, but
     if you redistribute a modified version, please attach a note listing the



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     modifications you have made.

     Address bug reports and comments to:  [e-mail]

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     the _C_G_I::_C_a_r_p manpage, the _C_G_I manpage

     =cut












































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