Harmonize response header behavior #706

Job	Run time
mono_repo self validate	22s
analyze_and_format; Dart 2.19.0; PKG: pkgs/http_client_conformance_tests; `dart analyze --fatal-i...	36s
analyze_and_format; Dart 3.0.0; PKG: pkgs/http; `dart analyze --fatal-infos`	23s
analyze_and_format; Dart dev; PKGS: pkgs/http, pkgs/http_client_conformance_tests; `dart analyze ...	34s
analyze_and_format; Dart dev; PKGS: pkgs/http, pkgs/http_client_conformance_tests; `dart format -...	26s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart run --define=no_default_http_client=true test/no_def...	19s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart test --platform vm`	41s
unit_test; Dart dev; PKG: pkgs/http; `dart run --define=no_default_http_client=true test/no_defau...	25s
unit_test; Dart dev; PKG: pkgs/http; `dart test --platform chrome`	2m 30s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart test --platform chrome`	2m 39s
unit_test; Dart dev; PKG: pkgs/http; `dart test --platform vm`	50s
	9m 45s

Provide feedback