fix(@angular/build): allow configuring Access-Control-Allow-Origin via headers option#32976
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alan-agius4 merged 2 commits intoangular:mainfrom Apr 10, 2026
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fix(@angular/build): allow configuring Access-Control-Allow-Origin via headers option#32976alan-agius4 merged 2 commits intoangular:mainfrom
alan-agius4 merged 2 commits intoangular:mainfrom
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…a headers option Removes the default Vite CORS origin: true configuration, allowing custom Access-Control-Allow-Origin header configurations to take effect when using the development server. BREAKING CHANGE: The development server (ng serve) no longer automatically mirrors the request origin in the Access-Control-Allow-Origin response header by default. If your application relies on cross-origin requests during local development, you must now explicitly configure the required CORS headers using the headers option in your angular.json configuration. Fixes angular#32923
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This pull request modifies the Angular dev server's Vite configuration to remove the default Access-Control-Allow-Origin: true setting, meaning the Access-Control-Allow-Origin header will no longer be automatically mirrored. A new test case was added to verify that when the header is explicitly configured, it is correctly applied. The reviewer suggests adding another test to explicitly confirm that the Access-Control-Allow-Origin header is not set by default when no headers option is provided, to fully cover the breaking change in behavior.
packages/angular/build/src/builders/dev-server/tests/options/headers_spec.ts
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dgp1130
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Apr 9, 2026
packages/angular/build/src/builders/dev-server/tests/options/headers_spec.ts
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…igin via headers option
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Removes the default Vite CORS origin: true configuration, allowing custom Access-Control-Allow-Origin header configurations to take effect when using the development server.
BREAKING CHANGE: The development server (ng serve) no longer automatically mirrors the request origin in the Access-Control-Allow-Origin response header by default. If your application relies on cross-origin requests during local development, you must now explicitly configure the required CORS headers using the headers option in your angular.json configuration.
Fixes #32923