readyState property

int readyState

Indicator of the current state of the request:

Value State Meaning
0 unsent open() has not yet been called
1 opened send() has not yet been called
2 headers received sent() has been called; response headers and status are available
3 loading responseText holds some data
4 done request is complete

Implementation

int get readyState native;

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https://api.dart.dev/stable/2.13.0/dart-html/HttpRequest/readyState.html