diff --git a/future-sir-frontend/app/.server/routes/dev/oidc-provider.tsx b/future-sir-frontend/app/.server/routes/dev/oidc-provider.tsx
index 9f10b94..d7346eb 100644
--- a/future-sir-frontend/app/.server/routes/dev/oidc-provider.tsx
+++ b/future-sir-frontend/app/.server/routes/dev/oidc-provider.tsx
@@ -6,7 +6,6 @@ import { randomUUID } from 'node:crypto';
 import { setTimeout } from 'node:timers';
 
 import type { Route } from './+types/oidc-provider';
-import type { ServerEnvironment } from '~/.server/express/environment';
 import type { TokenSet } from '~/utils/auth/authentication-strategy';
 
 type AuthCode = string;
@@ -89,8 +88,8 @@ export async function loader({ context, params, request }: Route.LoaderArgs) {
 /**
  * see: https://openid.net/specs/openid-connect-core-1_0.html#AuthorizationEndpoint
  */
-async function handleAuthorizeRequest({ context, request }: Route.LoaderArgs): Promise<void> {
-  const config = getConfig(context.environment.server);
+async function handleAuthorizeRequest({ request }: Route.LoaderArgs): Promise<void> {
+  const config = getConfig(new URL(request.url));
 
   const searchParams = new URL(request.url).searchParams;
 
@@ -162,8 +161,8 @@ async function handleAuthorizeRequest({ context, request }: Route.LoaderArgs): P
 /**
  * see: https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderConfig
  */
-function handleMetadataRequest({ context }: Route.LoaderArgs): Response {
-  const { issuer } = getConfig(context.environment.server);
+function handleMetadataRequest({ request }: Route.LoaderArgs): Response {
+  const { issuer } = getConfig(new URL(request.url));
 
   return Response.json({
     authorization_endpoint: `${issuer}/authorize`,
@@ -192,8 +191,8 @@ async function handleJwksRequest(): Promise<Response> {
 /**
  * see: https://openid.net/specs/openid-connect-core-1_0.html#TokenEndpoint
  */
-async function handleTokenRequest({ context, request }: Route.LoaderArgs): Promise<Response> {
-  const config = getConfig(context.environment.server);
+async function handleTokenRequest({ request }: Route.LoaderArgs): Promise<Response> {
+  const config = getConfig(new URL(request.url));
 
   const formData = await request.formData();
 
@@ -262,12 +261,12 @@ function handleUserinfoRequest(): Response {
 /**
  * Get the OIDC configuration.
  */
-function getConfig(environment: ServerEnvironment): OidcConfig {
+function getConfig(currentUrl: URL): OidcConfig {
   return {
-    issuer: `http://localhost:${environment.PORT}/auth/oidc`,
+    issuer: new URL('/auth/oidc', currentUrl.origin).toString(),
     clientId: '00000000-0000-0000-0000-000000000000',
     clientSecret: '00000000-0000-0000-0000-000000000000',
-    allowedRedirectUris: [`http://localhost:${environment.PORT}/auth/callback/local`],
+    allowedRedirectUris: [new URL('/auth/callback/local', currentUrl.origin).toString()],
   };
 }
 
diff --git a/future-sir-frontend/app/routes/auth/callback.tsx b/future-sir-frontend/app/routes/auth/callback.tsx
index 5d4423d..49723f4 100644
--- a/future-sir-frontend/app/routes/auth/callback.tsx
+++ b/future-sir-frontend/app/routes/auth/callback.tsx
@@ -46,14 +46,14 @@ export async function loader({ context, params, request }: Route.LoaderArgs) {
     }
 
     case 'local': {
-      const { ENABLE_DEVMODE_OIDC, PORT } = environment.server;
+      const { ENABLE_DEVMODE_OIDC } = environment.server;
 
       if (!ENABLE_DEVMODE_OIDC) {
         throw Response.json(null, { status: 404 });
       }
 
       const authStrategy = new LocalAuthenticationStrategy(
-        new URL(`http://localhost:${PORT}/auth/oidc`),
+        new URL('/auth/oidc', currentUrl.origin),
         new URL(`/auth/callback/${provider}`, currentUrl.origin),
         '00000000-0000-0000-0000-000000000000',
         '00000000-0000-0000-0000-000000000000',
diff --git a/future-sir-frontend/app/routes/auth/login.tsx b/future-sir-frontend/app/routes/auth/login.tsx
index ca8deb3..595cf4e 100644
--- a/future-sir-frontend/app/routes/auth/login.tsx
+++ b/future-sir-frontend/app/routes/auth/login.tsx
@@ -53,14 +53,14 @@ export async function loader({ context, params, request }: Route.LoaderArgs) {
     }
 
     case 'local': {
-      const { ENABLE_DEVMODE_OIDC, PORT } = environment.server;
+      const { ENABLE_DEVMODE_OIDC } = environment.server;
 
       if (!ENABLE_DEVMODE_OIDC) {
         throw Response.json(null, { status: 404 });
       }
 
       const authStrategy = new LocalAuthenticationStrategy(
-        new URL(`http://localhost:${PORT}/auth/oidc`),
+        new URL('/auth/oidc', currentUrl.origin),
         new URL(`/auth/callback/${provider}`, currentUrl.origin),
         '00000000-0000-0000-0000-000000000000',
         '00000000-0000-0000-0000-000000000000',