Hello everybody, I write here to find out if this is possible:
I want to expire an static file in the web browser through an HTTP header (Expires, Cache-Control or something else) sent from a PHP program. The usual thing is that those headers apply only to the program or file sending those headers, what I want is that a program sends those headers to affect a different file in the browser cache. In more detail, My web app generates a JavaScript file from the information stored in the database, that file represents the user menu and it is what the user sees in the web browser. Now, through an apache directive I set expiration times for several kinds of static resources so the web server doesn't get slash dotted with lots of unnecessary requests (this is a web app with lots of traffic). Although the JavaScript files are generated from PHP, it is seen as static content from the web browser POV. Right now I have set the expiration time for the menu files to 20 minutes. But let's say an admin user change the permissions of a user and the affected user hits a link that says "Regenerate menu". What will happen is that the JavaScript file will be regenerated on the web server but there is a chance that the browser won't see the change because the file is still valid in the cache. I know I could reduce the expiration time to reduce this problem but most of the time those files do not change. What can I do to notify the web browser that the file in the cache is no longer valid? I hope there is enough information here and that somebody can give me a hint in the right direction. Thanks, -William -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
