OptionalcontextThe same context object you specified in details.
The final URL after redirection.
OptionallengthOnly provided when available.
OptionalloadedOnly provided when available.
Only provided when available.
Only provided when available.
OptionaltotalOnly provided when available.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#properties https://developer.mozilla.org/en-US/docs/Web/API/ProgressEvent#properties