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Apply custom headers in RCTReconnectingWebSocket#55591

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cortinico wants to merge 6 commits intofacebook:mainfrom
cortinico:export-D93490948
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Apply custom headers in RCTReconnectingWebSocket#55591
cortinico wants to merge 6 commits intofacebook:mainfrom
cortinico:export-D93490948

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Summary: Inject custom devsupport headers into the HMR WebSocket connection. Changes from initWithURL: to initWithURLRequest: so headers can be set on the HTTP upgrade handshake.

Differential Revision: D93490948

Summary: Add a thread-safe singleton that holds custom HTTP headers to be applied to all iOS devsupport network requests. This mirrors the Android `DevSupportHttpClient` from D93481539. Uses a GCD concurrent queue with barrier writes for reader-writer synchronization.

Differential Revision: D93490954
Summary: Inject custom devsupport headers into bundle download requests. This ensures that multipart bundle fetches include any headers registered via `RCTDevSupportHttpHeaders`.

Differential Revision: D93490951
Summary: Inject custom devsupport headers into the packager status check request. Changes NSURLRequest to NSMutableURLRequest to allow header mutation before the request is sent.

Differential Revision: D93490952
Summary: Inject custom devsupport headers into the open-debugger POST request. This ensures the debugger launch request includes any registered custom headers.

Differential Revision: D93490950
Summary: Inject custom devsupport headers into inspector resource loading requests. This ensures that inspector network fetches include any registered custom headers.

Differential Revision: D93490953
Summary: Inject custom devsupport headers into the HMR WebSocket connection. Changes from `initWithURL:` to `initWithURLRequest:` so headers can be set on the HTTP upgrade handshake.

Differential Revision: D93490948
@meta-cla meta-cla bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Feb 17, 2026
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meta-codesync bot commented Feb 17, 2026

@cortinico has exported this pull request. If you are a Meta employee, you can view the originating Diff in D93490948.

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