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First, there's no cross-region problem at all.
I found if the server response an empty content body, jQuery consider this as fail()?
Why is this?
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version added: 1.0. Whenever an Ajax request completes with an error, jQuery triggers the ajaxError event. Any and all handlers that have been registered with the . ajaxError() method are executed at this time.
The ajaxStop() method specifies a function to run when ALL AJAX requests have completed. When an AJAX request completes, jQuery checks if there are any more AJAX requests. The function specified with the ajaxStop() method will run if no other requests are pending.
The function accepts two arguments: The raw data returned from the server and the 'dataType' parameter. The type of data that you're expecting back from the server.
The best way to bubble that error from the server side (using php) to the client side is to send a header through the Ajax request somewhere in the 400's (which is always associated with errors). Once the Ajax request receives this it will trigger your error function.
If you're using jQuery >= 1.9 an empty JSON response will be rejected, according to the API documentation:
The JSON data is parsed in a strict manner; any malformed JSON is rejected and a parse error is thrown. As of jQuery 1.9, an empty response is also rejected; the server should return a response of
nullor{}instead.
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WynandB is correct, however there is an alternate resolution: have the server return HTTP 204 No Content instead, which will make jQuery ignore the parsing error.
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