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Fix XMLHttpRequest.setRequestHeader to append duplicate headers per spec #56394

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fix: setRequestHeader should append per XHR spec

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Fix XMLHttpRequest.setRequestHeader to append duplicate headers per spec #56394

fix: setRequestHeader should append per XHR spec
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Facebook GitHub Tools / Facebook Internal - Builds & Tests required action Apr 9, 2026 in 2h 30m 41s

909 passed, 6 warning, 52 advice_no_signal, 13 warning_nosignal, 16 warning_preexisting, 1 warning_suppressed

909 passed, 6 warning, 52 advice_no_signal, 13 warning_nosignal, 16 warning_preexisting, 1 warning_suppressed internally at Meta.

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If you are a Meta employee, you can view these tests on Phabricator.

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