从PHP缓存头 [英] caching headers from PHP

问题描述

在PHP中，默认情况下没有缓存相关的头被发送。

In PHP, by default no cache related headers are sent.

HTTP/1.1 200 OK
Date: Fri, 19 Nov 2010 11:02:16 GMT
Server: Apache/2.2.15 (Win32) PHP/5.2.9-2
X-Powered-By: PHP/5.2.9-2
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 26
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html

现在，因为默认情况下它并没有说明任何缓存，可以把它导致在某些情况下说example.com/index.php得到缓存？

Now, since by default it does not say anything about caching, can it result in say example.com/index.php getting cached in some situations?

推荐答案

是的。一般情况下，每一个成功的响应可能会被缓存除非有一些约束：

Yes. In general, every successful response may be cached unless there are some constrains:

除非明确由一个缓存控制约束（ 14.9节）指令，缓存系统可以始终保存成功响应（见的作为缓存条目部分13.8 ），可以返回它而不验证它是否是新鲜的，并成功验证后可能返回。

Unless specifically constrained by a cache-control (section 14.9) directive, a caching system MAY always store a successful response (see section 13.8) as a cache entry, MAY return it without validation if it is fresh, and MAY return it after successful validation.

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