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Replace the permissive CheckOrigin (always true) with proper origin validation. Allows the app's own origin (derived from WEBHOOK_CALLBACK_URL), OBS browser sources (obs://), empty origins (same-origin/non-browser), and localhost in development mode. Rejects all other origins.
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Summary
CheckOrigin(always returnstrue) with proper origin validation to prevent Cross-Site WebSocket Hijacking (CSWSH)WEBHOOK_CALLBACK_URL),obs://(OBS browser sources), empty origin (same-origin/non-browser clients), localhost (dev mode only)Test plan
make test-shortpassesmake lintpassesmake buildpasses