isRedirect property
bool isRedirectReturns whether the status code is one of the normal redirect codes HttpStatus.MOVED_PERMANENTLY, HttpStatus.FOUND, HttpStatus.MOVED_TEMPORARILY, HttpStatus.SEE_OTHER and HttpStatus.TEMPORARY_REDIRECT.
Source
bool get isRedirect;
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https://api.dartlang.org/stable/1.24.3/dart-io/HttpClientResponse/isRedirect.html