The cache header does not work <meta http-equiv= "Cache-control" content= "max-age=7200"/> What to do with

Cache header does not work
I have a question for you.

In the HTML page add this sentence useless don't know what reason


Or is there any way to control a single static page cache time?


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How do you use it?
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Look at it as if it did not play a role, very little use of this parameter, to see if there are other people can help you. I'm sorry
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Kiss, you can try this oh.
Refer to the header of the PHP manual for specific usage
Header (' last-modified: '. Gmdate (' d, D M Y h:i:s ', $time). ' GMT ');

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