HTTP Header header Set reverse proxy not cached

One: Concept description

Expries: Page cache expiration time, to the specified date page cache failure

Last-modified: Latest update time for Web pages

Cache-control Cache Control

No-cache: Do not cache Web pages

No-store: Do not cache Web pages, if any, delete them

Must-revalidate: Enable the server response to use cache lifetime before it takes effect

The post-cache:ie5.0 "lazy" update switch, set to 0, indicates a timely update.

The pre_cache:ie5.0 "lazy" update switch, set to 0, indicates a timely update.

Max-age: With expires, priority is higher than expires, will overwrite expires value.

Pragma

No-cache: Do not cache Web pages, in order to compatible browsers, some browsers set some instructions valid.

Note: All time settings are in GMT format, which is the HTTP time (http-date) format specified in the HTTP protocol

Second: PHP output control

A: output is not cached

Header ("Expires: A Time in the past");

Header ("Last-modified: Current Time");

Header ("cache-control:no-stroe,no-cache,must-revalidate,post-check=0,pre-check=0");

Header ("Pragma:no-cache"); Reverse proxy can not cache Web pages

Example:

Header ("Expires:mon, June June 1997 05:00:00 GMT");

July 26, 1997 cache expiration, because the time is already past, so cache failure.

Header ("last-modified:"). Gmdate ("D, D M Y h:i:s"). "GMT");

Cache Update Time

Header ("Cache-control:no-cache, Must-revalidate, No-store, No-cache, Must-revalidate, post-check=0, pre-check=0");

Do not cache Web pages

Header ("Pragma:no-cache");

Do not cache Web pages

B: Output Permanent cache

Header ("Expires: A Time in the future");

Header ("Last-modified: Current Time");

C: Expiration after part of output cache time

Header ("Expires: Time of Expiration");

Or: Header ("cache-control:max-age= seconds");

Header ("Last-modified: Current Time");