Revert "enable static api url"

This reverts commit 20c170bbd5.

apps/login/next-env-vars.d.ts

@@ -10,18 +10,10 @@ declare namespace NodeJS {
     SYSTEM_USER_PRIVATE_KEY: string; // The fallback service user private key
 
     /**
-     * Self hosting: The Zitadel API url
+     * Self hosting: The instance url
      */
     ZITADEL_API_URL: string;
 
-    /**
-     * Takes effect only if ZITADEL_API_URL is not empty.
-     * This is only relevant if Zitadels runtime has the ZITADEL_INSTANCEHOSTHEADERS config changed.
-     * The default is x-zitadel-instance-host.
-     * Most users don't need to set this variable.
-     */
-    ZITADEL_INSTANCE_HOST_HEADER: string
-
     /**
      * Self hosting: The service user id
      */

apps/login/src/lib/service.ts

@@ -49,15 +49,8 @@ export async function createServiceForHost<T extends ServiceClass>(
     throw new Error("No token found");
   }
 
-  const instanceHost = new URL(serviceUrl).host
   const transport = createServerTransport(token, {
-    baseUrl: process.env.ZITADEL_API_URL ?? serviceUrl,
-    interceptors: process.env.ZITADEL_API_URL && process.env.ZITADEL_API_URL != serviceUrl || process.env.ZITADEL_INSTANCE_HOST_HEADER ? [(next) => {
-      return (req) => {
-        req.header.set(process.env.ZITADEL_INSTANCE_HOST_HEADER ?? "x-zitadel-instance-host", instanceHost)
-        return next(req)
-      }
-    }] : undefined
+    baseUrl: serviceUrl,
   });
 
   return createClientFor<T>(service)(transport);