added comment

Author: conico974

packages/open-next/src/adapters/middleware.ts

@@ -69,7 +69,8 @@ const defaultHandler = async (internalEvent: InternalEvent) => {
               url: "/500",
               method: "GET",
             },
-            isExternalRewrite: result.isExternalRewrite,
+            // On error we need to rewrite to the 500 page which is an internal rewrite
+            isExternalRewrite: false,
             origin: false,
             isISR: result.isISR,
           };

packages/open-next/src/core/requestHandler.ts

@@ -87,6 +87,7 @@ export async function openNextHandler(
               cookies: {},
               remoteAddress: "",
             },
+            // On error we need to rewrite to the 500 page which is an internal rewrite
             isExternalRewrite: false,
             isISR: false,
             origin: false,