Avoid form fields resetting when going back after following a link

I'd like to make sure that after editing and then navigating away from a form (pressing Back or clicking a link) and returning (using the Back or Forward button), the form data is not reset. I have verified that this works on another web site. What do I need to check?

Before answering, please note that I'm not submitting and then going back. Simply following links a开发者_StackOverflownd then returning.

Context:

• Firefox.
• JavaScript is disabled in the browser.
• The web site is on an intranet.
• A proxy is used system-wide, but it connects directly on the intranet.
• The web page is served over HTTP.
• The markup is valid XHTML 1.0 Transitional.
• The markup contains no frames.
• The back-end language is PHP.
• The web server is Apache.
• The server is a custom Linux distro.

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Most browsers cache form input values. So when user refreshes page, the inputs have same values.

You should check your code-behind for browser cache manipulations like:

<?
  Header('Cache-Control: no-cache');
  Header('Pragma: no-cache');
  ?>

and also your plain HTML-templates for:

<meta http-equiv="Expires" content="Tue, 01 Jan 2000 12:12:12 GMT">

or

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