add log

packages/gitbook-v2/src/middleware.ts

@@ -200,6 +200,7 @@ function getSiteURLFromRequest(request: NextRequest): URLWithMode | null {
     }
 
     const xForwardedHost = request.headers.get('x-forwarded-host');
+    console.log('x-forwarded-host', xForwardedHost);
     // The x-forwarded-host is set by Vercel for all requests
     // so we ignore it if the hostname is the same as the instance one.
     if (xForwardedHost) {