如何强制Chrome不缓存重定向？ [英] How to force Chrome NOT to cache redirects?

问题描述

简单的HTML代码：

 < img src =http：//someaddr/image.php> 
  

image.php是一个脚本，它将随机重定向返回到一个静态图像，并带有所有必要的no-cache头文件：

$ p $ Cache-Control：no-cache，no-store，must-revalidate
Pragma：no-cache
过期：0
地点：http：//someaddr/random_image_12345.jpg


问题：在浏览这个HTML页面时，Chrome（最新win / mac）不会重新验证地址 http：//someaddr/image.php 。

我试过使用重定向302和303（在RFC中有更强烈的要求，它永远不会被浏览器缓存）。这在IE，FireFox，Opera中很有用。他们总是刷新 http：//someaddr/image.php 。但Chrome并没有。

我甚至在Chrome中使用过开发者工具，而且似乎在网络日志中它甚至不会显示任何尝试（缓存与否）获取 http：//someaddr/image.php 。网络日志只显示一个已连接到 http：//someaddr/random_image_12345.jpg （缓存）的连接。为什么这么糟糕...

我知道将查询字符串放在图片源中的朴素/简单的解决方案：

 < img src =http：//someaddr/image.php？refresh = {任意随机数或时间戳}> 
  

但我不喜欢/不能使用这样的黑客。有没有其他选择？

解决方案

尝试307重定向

但如果您因为缓存重定向而无法连接到某个链接...

这并不能清除缓存，但如果你想要找到一个已被重定向缓存的链接，那么这是一条快速且可行的路线。

将链接地址复制到地址栏中，并在地址中添加一些GET信息。

示例您的网站 http://example.com

 在其末尾放置一个？x = y 
（example.com？x = y） -  x和y可以是任何你想要的。 
  

如果已经有了？在它后面的一些信息的url

 （example.com?this=that&true = t） - 尝试添加& ; x = y到它的结尾... 
 
（example.com?this=that&true=t&x=y）
  

A simple HTML code:

<img src="http://someaddr/image.php">

image.php is a script that returns a random Redirect to a static image with all necessary no-cache headers:

Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: 0
Location: http://someaddr/random_image_12345.jpg

The problem: when navigating back and forward to this HTML page, Chrome (latest win/mac) does not revalidate address http://someaddr/image.php.

I have tried using redirects 302 and also 303 (which in RFC has stronger requirement that it should NEVER been cached by browser). This works like a charm in IE, FireFox, Opera. They always refresh http://someaddr/image.php. But Chrome doesn't.

I have even used Developer Tools in Chrome, and it seems that in Network Log it even don't shows any attempt (cached or not) of fetching http://someaddr/image.php. Network Log shows only one connection already to http://someaddr/random_image_12345.jpg (cached). Why this is so broken...

I know the naive/simple solution of putting query string in image source:

    <img src="http://someaddr/image.php?refresh={any random number or timestamp}">

But I don't like/can't use hacks like that. Are there ANY other options?

解决方案

Try a 307 redirect

But if you're stuck trying to get to a link that won't work due to a cached redirect...

This doesn't clear the cache but it's one quick and possible route around it if you're pulling your hair out trying to get to a link that has been redirect cached.

Copy the link address into the address bar and add some GET information to the address.

EXAMPLE If your site is http://example.com

Put a ?x=y at the end of it 
( example.com?x=y ) - the x and y could be anything you want.

If there is already a ? in the url with some info after it

( example.com?this=that&true=t ) - try to add &x=y to the end of it...

( example.com?this=that&true=t&x=y )

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