Html 元标记中的错误值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/12693630/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Bad values in meta tags
提问by José Carlos
I've got a problem when I pass the html5 validator to my site from w3c validator. The errors are next:
当我从 w3c 验证器将 html5 验证器传递到我的网站时遇到问题。错误如下：
Bad value Content-Script-Type for attribute http-equiv on element meta
<meta http-equiv="Content-Script-Type" content="text/javascript" >
Bad value expires for attribute http-equiv on element meta
<meta http-equiv="expires" content="Wed, 26 Feb 1997 08:21:57 GMT" >
Bad value pragma for attribute http-equiv on element meta
<meta http-equiv="pragma" content="no-cache" >
Bad value Cache-Control for attribute http-equiv on element meta.
<meta http-equiv="Cache-Control" content="no-cache" >
What are the correct values to meta tags to pass html5 validator?
传递 html5 验证器的元标记的正确值是什么？
采纳答案by ews2001
For HTML5 you use a cache manifest file in the header. This is an example of how to use: http://www.w3.org/TR/html5/browsers.html#manifests
对于 HTML5，您在标题中使用缓存清单文件。这是如何使用的示例：http: //www.w3.org/TR/html5/browsers.html#manifests
Also, you force no cache with this:
此外，您强制不缓存：
<meta http-equiv="expires" content="0">
This is a good tutorial on how to use the cache manifest file: https://www.html5rocks.com/en/tutorials/appcache/beginner/#toc-manifest-file-creating
这是一个关于如何使用缓存清单文件的好教程：https: //www.html5rocks.com/en/tutorials/appcache/beginner/#toc-manifest-file-creating
回答by CoR
The accepted answer is wrong! Thisis a good answer.
接受的答案是错误的！这是一个很好的答案。
To quote Alohci:
引用 Alohci 的话：
Putting caching instructions into meta tags is not a good idea, because although browsers may read them, proxies won't. For that reason, they are invalid and you should send caching instructions as real HTTP headers.
将缓存指令放入元标记并不是一个好主意，因为尽管浏览器可能会读取它们，但代理不会。因此，它们是无效的，您应该将缓存指令作为真正的 HTTP 标头发送。
Addendum: For Apache and .htaccess you could use
附录：对于 Apache 和 .htaccess，您可以使用
<ifmodule mod_expires.c>
ExpiresActive On
ExpiresDefault value or
ExpiresByType text/css "access plus 1 month"
...
</IfModule>
PHP have headers_sent() and header() function for that.
PHP 有 headers_sent() 和 header() 函数。
function header_no_cache () {
\header('Cache-Control: no-cache, no-store, must-revalidate'); // HTTP 1.1.
\header('Pragma: no-cache'); // HTTP 1.0.
\header('Expires: 0'); // Proxies.
}
Point is that caching instructions should be in header. Not in html file.
重点是缓存指令应该在标题中。不在 html 文件中。
