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UNSENT	0	The object has been constructed.
OPENED	1	The open() method has been successfully invoked. During this state request headers can be set using setRequestHeader() and the request can be made using the send() method.
HEADERS_RECEIVED	2	All redirects (if any) have been followed and all HTTP headers of the final response have been received. Several response members of the object are now available.
LOADING	3	The response entity body is being received.
DONE	4	The data transfer has been completed or something went wrong during the transfer (e.g. infinite redirects).

- If the state is UNSENT or OPENED, return 0. - If the error flag is set, return 0. - Return the HTTP status code.

note : ajouter on devant chaque nom d'event pour usage, ex pour readystatechange :

xhr.onreadystatechange = function() {
    	// blablabla
};

(xhr étant un objet XMLHttpRequest)

Event name	Interface	Dispatched when…
readystatechange	Event	The readyState attribute changes value, except when it changes to UNSENT.
loadstart	ProgressEvent	The request starts.
progress	ProgressEvent	Transmitting data.
abort	ProgressEvent	The request has been aborted. For instance, by invoking the abort() method.
error	ProgressEvent	The request has failed.
load	ProgressEvent	The request has successfully completed.
timeout	ProgressEvent	The author specified timeout has passed before the request completed.
loadend	ProgressEvent	The request has completed (either in success or failure).