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

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zmunm wants to merge 2 commits intofacebook:mainfacebook/react-native:mainfrom

zmunm:xhr-setrequestheader-appendzmunm/react-native:xhr-setrequestheader-appendCopy head branch name to clipboard

Conversation Commits2 (2)Checks Files changed

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Fix XMLHttpRequest.setRequestHeader to append duplicate headers per spec#56394
zmunm wants to merge 2 commits intofacebook:mainfrom
zmunm:xhr-setrequestheader-append

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Commits on Apr 9, 2026

test: add setRequestHeader append behavior tests
zmunm
committed
fix: setRequestHeader should append per XHR spec
zmunm
committed

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