强制页面从服务器重新加载而不是加载缓存版本 [英] Force page to reload from server instead of load the cached version

问题描述

我有网页A.用户点击表单提交数据，然后将他带到网页B.当他点击后退按钮时，我需要从服务器刷新网页A，而不是从缓存加载。我有这个：< meta http-equiv =expirescontent =0> 但它似乎无法正常工作。我也尝试在页面B上设置变量（通过php设置会话变量）然后在页面A上检查它并根据它的存在刷新（或不刷新）。这种做法似乎也有效。基本代码是：
页面A：

I have webpage A. The user clicks on a form to submit data, and it takes him to webpage B. When he clicks the back button, I need webpage A to be refreshed from the server, rather that loaded from cache. I have this: <meta http-equiv="expires" content="0"> but it doesnt seem to work. I have also tried setting a variable on page B (session variable via php) and then check for it on page A and refresh (or not) according to its existence. This doest seem to work either. The basic code for that is: Page A:

<?php 
if(isset($_SESSION['reloadPage'])) {
unset($_SESSION['reloadPage']);
echo'
<script>
window.location.replace("/****/****/*****.php");
</script>
';
}
?>

在页面B上：

$_SESSION['reloadPage'] = 1;

使用PHP解决方案，它只是不断尝试在永无止境的循环中刷新页面。我的逻辑缺少什么？这是正确的方法吗？

With the PHP solution, it simply keeps trying to refresh the page in a never ending loop. Something in my logic missing? Is this the right way to go about it?

编辑
进一步调查后，当您告诉浏览器不缓存时页面，是否强制完整的服务器端刷新？这就是我需要的。页面的完整服务器端刷新。

EDIT Upon further investigation, when you tell the browser to not cache the page, does that force a full server side refresh as well? That's what I need. A full server side refresh of the page.

推荐答案

确定试试这个：

<?php
    if(!session_id()) {
        @session_start();   
    }
    header('Expires: Sat, 26 Jul 1997 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('Cache-Control: post-check=0, pre-check=0', false);
    header('Pragma: no-cache'); 

    if(isset($_SESSION['form_submitted'])) {
        unset($_SESSION['form_submitted']);
        header('Location: ?' . uniqid());
        #header('Refresh: 0');
    }
?>

您需要在第2页设置$ _SESSION ['form_submitted'] = true。

You will need to set $_SESSION['form_submitted'] = true on page 2.

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