fix and update

apps/api-gateway/src/lib/fedcm-config.ts

@@ -5,6 +5,7 @@ import { resolveFrontendUrl, resolveOAuthIssuer } from './oauth-issuer';
 import {
   normalizePublicBaseUrl,
   preferCanonicalBase,
+  resolveFedcmWebIdentityOrigin,
   resolvePublicApiBaseFromRequest,
   resolvePublicFrontendBaseFromRequest
 } from './public-url';
@@ -25,13 +26,7 @@ export interface FedcmEndpoints {
 function buildFedcmEndpointUrls(issuer: string, frontendUrl: string) {
   const base = normalizePublicBaseUrl(issuer);
   const front = normalizePublicBaseUrl(frontendUrl);
-
-  let webIdentityOrigin = front;
-  try {
-    webIdentityOrigin = new URL(base).origin;
-  } catch {
-    // keep frontend origin
-  }
+  const webIdentityOrigin = resolveFedcmWebIdentityOrigin(base, front);
 
   return {
     configUrl: `${base}/fedcm/config.json`,