"Refresh" http-equiv Meta Tag

This section provides a tutorial example on how to create 'Refresh' http-equiv Meta Tag in the HTML document header to ask the browser to refresh Web pages.

There is also another way to ask the browser to make a subsequent HTTP request after the current HTML document has been displayed. That is to use the "Refresh" "http-equiv" meta tag in the HTML document header.

Here is a simple example Perl CGI script, CGI-pm-Redirect-URI.pl, to show you how to create the "http-equiv" meta tag with the CGI.pm module.

#!c:/local/perl/bin/perl.exe
#- CGI-pm-http-equiv-Refresh.pl
#- Copyright (c) 2014, HerongYang.com, All Rights Reserved.
   
   use CGI;
   $query = CGI->new();
   print $query->header();

#- Set the HEAD elements
   print $query->start_html(
      -title=>'A Simple Web Clock',
      -head=>$query->meta({-http_equiv=>'Refresh',
         -content=>'1,http://localhost/CGI-pm-http-equiv-Refresh.pl'}));

   ($sec, $min, $hour) = localtime(time());
   print $query->p('Current time: '.$hour.':'.$min.':'.$sec."\n");
   print $query->end_html();

Copy CGI-pm-http-equiv-Refresh.pl to C:\local\apache\htdocs.

Now, enter this URI into your browser address: http://localhost/CGI-pm-http-equiv-Refresh.pl. You should see a simple text clock on the browser screen:

Current time: 20:28:33

Notice how the browser makes a request every second to update the time on the clock.

Last update: 2014.

Table of Contents

 About This Book

 Perl on Linux Systems

 ActivePerl on Windows Systems

 Data Types: Values and Variables

 Expressions, Operations and Simple Statements

 User Defined Subroutines

 Perl Built-in Debugger

 Name Spaces and Perl Module Files

 Symbolic (or Soft) References

 Hard References - Addresses of Memory Objects

 Objects (or References) and Classes (or Packages)

 Typeglob and Importing Identifiers from Other Packages

 String Built-in Functions and Performance

 File Handles and Data Input/Output

 Open Files in Binary Mode

 Open Directories and Read File Names

 File System Functions and Operations

 Converting Perl Script to Executable Binary

 Using DBM Database Files

 Using MySQL Database Server

 Socket Communication Over the Internet

 XML::Simple Module - XML Parser and Generator

 XML Communication Model

 SOAP::Lite - SOAP Server-Client Communication Module

 Perl Programs as IIS Server CGI Scripts

 CGI (Common Gateway Interface)

 XML-RPC - Remote Procedure Call with XML and HTTP

 RPC::XML - Perl Implementation of XML-RPC

 Integrating Perl with Apache Web Server

CGI.pm Module for Building Web Pages

 What Is CGI.pm?

 Generating HTML Document with CGI.pm

 Retrieving Query Parameters and Headers

 Retrieving Environment and Script Information

 Redirecting Browser to a URI

"Refresh" http-equiv Meta Tag

 What Is CGI::Cookie?

 Retrieving and Setting HTTP Cookies

 LWP::UserAgent and Web Site Testing

 References

 PDF Printing Version