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[Edward]

When i was logged into Knowledge is Power as Admin, i clicked "Add Page" in the administration section, then add_page.php section is loaded.

 

Then i entered some sample data which did not meet full validation.

 

I then clicked on the browser back button which reset the form data, then clicked on the browser forward button, which brought me to this error:

 

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This document is no longer available.

 

The requested document is not available in Firefox's cache.

As a security precaution, Firefox does not automatically re-request sensitive documents.

Click Try Again to re-request the document from the website.

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So what does this mean? How can this error be prevented? Is this something that frameworks like Yii handle automatically?

[Jaepee]

Hi Edward I had a similar error message with a search script I made(e.g. clicking the back button). The following code fixed my problem.

 

// call this before session_start(); // 
session_cache_limiter ('private, must-revalidate');
$cache_limiter = session_cache_limiter();
//
session_cache_expire(60); // 60 minutes

 

I beleive it keeps the form data from the headers stored in the server cache for 60 minutes.

 

jp

[Edward]

Thanks this is one of the best posts I've seen here, caching which is important seems to be a neglected topic in today's php books. I see this appearing frequently in frameworks.