Should Get or should Post be used to get AJAX content that expires often?

I have AJAX calls that get content that开发者_运维技巧 expires often.

To get that content is is better practice to use:

• Post

or

• Get and set the Cache Expiration Date as immediate on the server?

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You should use GET with this kind of header: "Cache-Control: no-cache, must-revalidate" read when POST should be used.

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If you're only retrieving data, then you should use GET and use the appropriate cache-related HTTP headers.