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Opera browser caches my validation image!

 
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Opera browser caches my validation image!
Dancia
post 26 Jun, 2008 - 09:42 AM
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Ok the problem is that then someone visits my registration page, then function automatically regenerates the rand_image.gif image. Unfortunately if user didn't type it right, Opera catches the image and displays the same one, but my function has already generated another one. On pressing: index?action=register nothing changes! I think that's because Opera has integrated some king of image cathing. Weird stuff. The only thing that helps is pressing refresh button. (Actually there is cache images in Opera, then I even can't get desired effect by refreshing it if enabled!)

Any tips?

With firefox and ie everything is fine.

This post has been edited by Dancia: 26 Jun, 2008 - 09:44 AM
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MitkOK
post 26 Jun, 2008 - 09:55 AM
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HMTL
html
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">


PHP
php
<?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Pragma: no-cache"); // HTTP/1.0; 
?>


This post has been edited by MitkOK: 26 Jun, 2008 - 10:01 AM
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Dancia
post 26 Jun, 2008 - 10:19 AM
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QUOTE(MitkOK @ 26 Jun, 2008 - 09:55 AM) *

HMTL
html
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">


PHP
php
<?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Pragma: no-cache"); // HTTP/1.0; 
?>




Already tried. Doesn't work ;/.

This post has been edited by Dancia: 26 Jun, 2008 - 10:22 AM
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mocker
post 26 Jun, 2008 - 10:34 AM
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You could append a random string to the end of the filename, or a timestamp..

<img src='rand_image.gif?q=psenfselkfnes'>
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JBrace1990
post 26 Jun, 2008 - 11:18 AM
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mocker's idea is good... I would have suggested telling the user they have to refresh because it's client side >_>
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Dancia
post 26 Jun, 2008 - 12:48 PM
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mocker's idea doesn't work (but i didn't try data stamping, coz don't know how). So I will just leave note for opera users about this in help section.
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born2c0de
post 26 Jun, 2008 - 11:11 PM
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printf("I'm a %XR",195936478);

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I'm no PHP expert, but I just want you to know that as an Opera user, I haven't had any problems with CAPTCHAs on any other website.

You're probably not implementing it right.

Try this instead.
php
<?php
session_start();
header("Expires: Mon, 27 Jun 2008 05:00:00 GMT");  
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); 
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Pragma: no-cache");
?>
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