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apps/website/src/proxy.ts

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+import { NextResponse } from 'next/server';
+import type { NextRequest } from 'next/server';
+import { SUPPORTED_LOCALES, DEFAULT_LOCALE } from './lib/locales';
+
+// Paths that should not be localized
+const PUBLIC_FILE = /\.(.*)$/;
+const SKIP_PATHS = ['/_next', '/api', '/favicon.ico', '/robots.txt', '/sitemap.xml', '/sitemap'];
+
+export function proxy(request: NextRequest) {
+  const { pathname } = request.nextUrl;
+
+  // Skip Next.js internals, APIs, and public files
+  if (
+    SKIP_PATHS.some((p) => pathname.startsWith(p)) ||
+    PUBLIC_FILE.test(pathname)
+  ) {
+    return NextResponse.next();
+  }
+
+  // Check if the pathname already has a locale
+  const pathnameHasLocale = SUPPORTED_LOCALES.some(
+    (locale) => pathname.startsWith(`/${locale}/`) || pathname === `/${locale}`
+  );
+
+  if (pathnameHasLocale) {
+    return NextResponse.next();
+  }
+
+  // Determine the preferred locale
+  // 1. Check cookie
+  const cookieLocale = request.cookies.get('homaroma_lang')?.value;
+  let targetLocale = DEFAULT_LOCALE;
+
+  if (cookieLocale && SUPPORTED_LOCALES.includes(cookieLocale as any)) {
+    targetLocale = cookieLocale as any;
+  } else {
+    // 2. Check Accept-Language header
+    const acceptLang = request.headers.get('accept-language');
+    if (acceptLang) {
+      const preferred = acceptLang.split(',')[0].split('-')[0].toLowerCase();
+      if (SUPPORTED_LOCALES.includes(preferred as any)) {
+        targetLocale = preferred as any;
+      }
+    }
+  }
+
+  // Redirect to the localized path
+  const newUrl = request.nextUrl.clone();
+  newUrl.pathname = `/${targetLocale}${pathname === '/' ? '' : pathname}`;
+  
+  return NextResponse.redirect(newUrl);
+}
+
+// Next.js 16 Proxy configuration
+export const config = {
+  matcher: [
+    /*
+     * Match all request paths except for the ones starting with:
+     * - api (API routes)
+     * - _next/static (static files)
+     * - _next/image (image optimization files)
+     * - favicon.ico, sitemap.xml, robots.txt (metadata files)
+     */
+    '/((?!api|_next/static|_next/image|favicon.ico|sitemap.xml|robots.txt).*)',
+  ],
+};