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CGI App - how to stop caching of pages?

Posted on 2001-06-03
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Last Modified: 2010-04-06
How can I get my CGI app to force the browser not to cache.  I want a particular action in my CGI app to always load from the server, not from cache.

I know the following html code works on plain html pages, but it doesn't work through my CGI app:
<head>
<meta HTTP-EQUIV="Pragma" CONTENT="no-cache">
<meta HTTP-EQUIV="Expires" CONTENT="Mon, 01 Jan 1996 23:59:59 GMT">
</head>

I've tried the following code in my CGI action, but it doesn't seem to work either:
Response.Date := Now-1;
Response.Expires := Now-1;

Any help will be appreciated
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Question by:cjclayton
10 Comments
 
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Expert Comment

by:Motaz
ID: 6151460
I have faced this problem befor, this code works fine in Win98 computers, and NT, but not with Win2000, I'm not sure is it a Web server problem or client problem.

Motaz
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Author Comment

by:cjclayton
ID: 6151475
I worked it out:
Response.SetCustomHeader('Cache-Control', 'no-store');
Response.SetCustomHeader('Pragma', 'no-store');
Response.SetCustomHeader('Expires', 'Mon, 01 Jan 1996 23:59:59 GMT');
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LVL 7

Expert Comment

by:Motaz
ID: 6151529
Did it works!! and in which windows version and web server

Motaz
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Author Comment

by:cjclayton
ID: 6151574
Should be:
Response.SetCustomHeader('Cache-Control', 'no-store');
Response.SetCustomHeader('Pragma', 'no-cache');
Response.SetCustomHeader('Expires', 'Mon, 01 Jan 1996 23:59:59 GMT');

Yes it did work! :)
I'm compiling on a W2K machine in Delphi 5 and releasing the exe on a NT 4 machine. I'm using IIS 4.

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LVL 7

Expert Comment

by:Motaz
ID: 6151760
cjclayton, I'll give you points for this solution, because I need it too.

btw. How did you know that solution? did you read it in a book?

Motaz
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LVL 7

Expert Comment

by:Motaz
ID: 6151767
I post points to you, did you find it?
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Author Comment

by:cjclayton
ID: 6151816
I was reading the delphi help for TWebResponse and came across the method SetCustomHeader().  I then found a couple of examples (found via www.yahoo.com - entered SetCustomHeader), but it wasn't for caching e.g.

SetCustomHeader('Content-Disposition', 'filename='+ExtractFilename(iFilename));
(I think it is used for downloading files, or something)

I then tried entering in the meta http-equiv caching values instead and it just worked!

Luck was on my side! :)
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Author Comment

by:cjclayton
ID: 6152274
How do I get the points?
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LVL 3

Expert Comment

by:nnbbb09
ID: 6174020
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Accepted Solution

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amp072397 earned 0 total points
ID: 6201923
PAQing this question.

amp
Community Support Moderator
Experts Exchange
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