what does xhr status code 408 error mean in jquery ajax

i am making aja开发者_如何学运维x calls with jquery like this

http://pastie.org/860837

and sometimes i get the ajax errors, and i get xhr status as 408. what does that mean?

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408 is really an HTTP status code, and it means that your request timed out:

408 Request Timeout

The server timed out waiting for the request.[2] According to W3 HTTP specifications: "The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time."

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Its a Request Timeout

The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time.

See HTTP/1.1 Status code definitions