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readyState of type unsigned short, readonly
The state of the object. The attribute MUSt be one of the following values:
0 Uninitialized
The initial value.
1 Open
The open() method has been successfully called.
2 Sent
The UA successfully completed the request, but no data has yet been received.
3 Receiving
Immediately before receiving the message body (if any). All HTTP headers have been received.
What about HEAD requests?
4 Loaded
The data transfer has been completed.