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Use handler.html instead of handler when FIREBASE_USE_HANDLER_EXT is set to true #9105

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Use handler.html instead of handler when FIREBASE_USE_HANDLER_EXT is set to true #9105

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7c7e73e
Added extension change for firebase studio'
maneesht Jun 19, 2025
11d5892
Create brown-trains-melt.md
maneesht Jun 19, 2025
a9480bf
Removed unnecessary changes
maneesht Jun 19, 2025
24b6f37
Formatting
maneesht Jun 19, 2025
e88a2f3
Merge branch 'mtewani/signinwithredirect-studio' of https://github.co…
maneesht Jun 20, 2025
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5 changes: 5 additions & 0 deletions .changeset/brown-trains-melt.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@firebase/auth": patch
---

Fix issue where using signInWithRedirect in Firebase Studio required a route rewrite for the auth handler widget.
10 changes: 9 additions & 1 deletion packages/auth/src/core/util/handler.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -129,7 +129,15 @@ export async function _getRedirectUrl(

function getHandlerBase({ config }: AuthInternal): string {
if (!config.emulator) {
return `https://${config.authDomain}/${WIDGET_PATH}`;
const path = `https://${config.authDomain}/${WIDGET_PATH}`;
if (
typeof process !== 'undefined' &&
process.env.FIREBASE_USE_HANDLER_EXT
) {
// Static servers require extensions to infer Content-Type
return `${path}.html`;
}
return path;
}

return _emulatorUrl(config, EMULATOR_WIDGET_PATH);
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