How to return a 200 ok status programmatically to ajax request in PHP?

I ask this question for the comment of this answer:

https://serverfault.com/quest开发者_开发技巧ions/104648/is-this-http-servers-issue/104679#104679

EDIT

I missed an important point,should also keep the connection not closed.

You guys can smell I'm trying to figure out how long polling actually works.

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200 OK happens as long as nothing goes wrong. So you should always get that status as long as the HTTP request succeeds. No need to do anything special.

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As of PHP 5.4.0 you can use http_response_code():

<?php http_response_code(200); ?>

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to complete hitautodestruc post, with PHP <5.4 you could also set

<?php header("HTTP/1.1 200 OK"); ?>

..but sending 200 code in any way is useless, since it is already sent by default when request completes, and if none error occurs otherwise on server-side (5xx)

maybe you are looking for something like this ?

HTTP/1.1 206    Partial Content