Traffic-Meta Tags-Page Caching

This is another way to control browser caching. To use this tag, the value must be "no-cache". When this is included in a document, it prevents Netscape Navigator from caching a page locally.

<meta http-equiv="Pragma" content="no-cache" />

The META Cache-Control, META Expires and META Pragma tags can be used as together to keep your content current—but beware: There are reports that Internet Explorer refuses the META tag instructions, and caches the files anyway.

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Caching
Meta Tags can control the way browsers cache pages. For example, if you update a page you may want your visitors to see only current versions of the page.

To set an expiry date:

<meta http-equiv="expires" content="date">

To instruct browsers not to cache a page:

<meta http-equiv="pragma" content="no-cache">

How to prevent caching in Internet Explorer

A Pragma: no-cache META tag is treated identically to Expires: -1 if used in a non-secure page. ... Bring up the Properties dialog for that directory. ...

SUMMARY

This article describes the use of HTTP headers to control the caching of Web pages in Internet Explorer.

You can use Microsoft Internet Information Server (IIS) to easily mark highly volatile or sensitive pages using the following script at the extreme beginning of the specific Active Server Pages (ASP) pages:


				<% Response.CacheControl = "no-cache" %>
<% Response.AddHeader "Pragma", "no-cache" %>
<% Response.Expires = -1 %>
				 
				HTTP-EQUIV META Tags
				HTML pages allow for a special HTTP-EQUIV form of the META tag 
				that specifies particular HTTP headers from within the HTML 
				document. Here is a short example HTML page that uses both 
				Pragma: no-cache and Expires: -1: 
				<HTML><HEAD>
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="-1">
</HEAD><BODY>
</BODY>
</HTML>
				 
				Server Options for Caching When the Cache-Control header needs to be used on non-ASP pages, it may be necessary to use options in the server configuration to add this header automatically. Refer to your server documentation for the process of adding HTTP headers to server responses for a particular directory. For example, in IIS 4, follow these steps: 
				
					
						•
						Invoke the Internet Services Manager.
					
					
						•
						Using the computer and services tree, 
						open the Default Web Server (or web server in question) 
						and find the directory containing the content that needs 
						the Cache-Control header.
					
					
						•
						Bring up the Properties dialog for that 
						directory.
					
					
						•
						Choose the HTTP Headers tab.
					
					
						•
						Click the Add button in the Custom HTTP 
						Headers group and add "Cache-Control" for the header 
						name and "no-cache" for the header value.

Meta Tags and Their Uses - Each of the basic meta tags explained ...

Metty Online this meta tag generator is the online version of ... Directory Add your webmaster resources or webmaster related site to our directory ...

Page caching

Browsers cache pages by default Select the No-Cache option to stop caching of your page

Webmaster Forum - No Cache Tag

Does anyone have any experience with the 'No Cache' meta tag? ... Partners: BlueFind Web Directory .::. SevenSeek .::. V7 Web Hosting .::. Host Detective . ...

Basics of No cache is given below:

HTTP 1.1. Allowed values = PUBLIC | PRIVATE | NO-CACHE | NO-STORE.
Public - may be cached in public shared caches
Private - may only be cached in private cache
no-Cache - may not be cached
no-Store - may be cached but not archived

The directive CACHE-CONTROL:NO-CACHE indicates cached information should not be used and instead requests should be forwarded to the origin server. This directive has the same semantics as the PRAGMA:NO-CACHE.
Clients SHOULD include both PRAGMA:NO-CACHE and CACHE-CONTROL:NO-CACHE when a no-cache request is sent to a server not known to be HTTP/1.1 compliant.
Also see EXPIRES.

Note: It may be better to specify cache commands in HTTP than in META statements, where they can influence more than the browser, but proxies and other intermediaries that may cache information.

I strongy recomend to read the source file:
http://www.w3.org/Protocols/rfc2068/rfc2068
http://www.i18nguy.com/markup/metatags.html#expires

Meta Tags

If your directory has been mapped on the server to a different name, ie, if http://www.gpc.edu/~pjoseph/ ... The inverse is also true, thus this META tag: ...

Pragma

This is another way to control browser caching. To use this tag, the value must be "no-cache". When this is included in a document, it prevents Netscape Navigator from caching a page locally.
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">

These two tags can be used as together as shown to keep your content current—but beware. Many users have reported that Microsoft’s Internet Explorer refuses the META tag instructions, and caches the files anyway. So far, nobody has been able to supply a fix to this "bug." As of the release of MSIE 4.01, this problem still existed.

Add Me!

To submit your site to up to 500 search engines and directories, go to this URL: ... RATING YOUR CONTENT By using the rating META tag on your site, ...

PREVENT CACHING

If you want to prevent a page being saved in your visitor's cache
you can do so by inserting the following two tags:

<META HTTP-EQUIV="expires" CONTENT="0">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">

Why would you want a page not to be cached? If your site is
updated frequently and you always want your visitors to see the
newest content/changes, or if you want to ensure that a new
banner is loaded each time from your server when a page is
accessed, you'll want to use the two tags above.

A quick note here on banner caching: In addition to using the two
tags above, you'll want to append random numbers at the end of
the tag calling the image. The ad serving software that I use,
Spinbox, does this for me.

Learn About HTML Tags, and page design issues (Free Internet ...

The <head> tag tells the browser, and the reader, that all of the information included has a special meaning separate to the described page itself. Tags nested within can include <meta> (various attributes) and <title> (very important) - see below. Other tags found within the <head></head> tag are BASE, LINK, RANGE, STYLE, and ISINDEX (only style and base are used very much today).
<meta>
<meta http-equiv="Expires" content="when"> notifies caching servers when to refresh the page <meta name="Author" content="who"> use obvious - copyright or development team member info <meta http-equiv="Pragma" content="no-cache"> notifies browsers and servers not to save in cache, and always access original file <meta http-equiv="Refresh" content="4; URL=link.url"> content = seconds - refreshes the page with URL (active samples in the Frames tutorial)

Meta Tag Name:	HTML x.x / XHTML x.x /
Example:
Recommendation:
Length: Minimum n/a Maximum n/a Recommended n/a
Description:
Comments:
Indexed by Google: unknown
Indexed by Yahoo: unknown
Indexed by MSN: unknown
Indexed by AOL: unknown
Other Examples:

•	Invoke the Internet Services Manager.
•	Using the computer and services tree, open the Default Web Server (or web server in question) and find the directory containing the content that needs the Cache-Control header.
•	Bring up the Properties dialog for that directory.
•	Choose the HTTP Headers tab.
•	Click the Add button in the Custom HTTP Headers group and add "Cache-Control" for the header name and "no-cache" for the header value.