Retrieve all the response headers from a request.
null
if no headers have been received. For multipart requests, getAllResponseHeaders
will return the response headers for the current part of the request.
See also HTTP response headers for a list of common response headers.
@Unstable() String getAllResponseHeaders() native;
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-html/HttpRequest/getAllResponseHeaders.html