Refactor 404 and 500 approach (#7754)

* fix(app): refactor 404 and 500 approach

* chore: refactor logic

* fix: always treat error as page

* test: migrate ssr-prerender-404 to node adapter

* feat: merge original response metadata with error response

* chore: update lockfile

* chore: trigger ci

* chore(lint): fix lint issue

* fix: ensure merged request has proper status

* fix(node): prerender test

* chore: update test label

* fix(node): improve 404 behavior in middleware mode

* fix(vercel): improve 404 behavior

* fix(netlify): improve 404 behavior

* chore: update test labels

* chore: force ci

* chore: fix lint

* fix: avoid infinite loops

* test: fix failing test in Node 18

* chore: remove volta

packages/integrations/vercel/src/edge/entrypoint.ts

@@ -13,21 +13,15 @@ export function createExports(manifest: SSRManifest) {
 	const app = new App(manifest);
 
 	const handler = async (request: Request): Promise<Response> => {
-		if (app.match(request)) {
-			Reflect.set(request, clientAddressSymbol, request.headers.get('x-forwarded-for'));
-			const response = await app.render(request);
-			if (app.setCookieHeaders) {
-				for (const setCookieHeader of app.setCookieHeaders(response)) {
-					response.headers.append('Set-Cookie', setCookieHeader);
-				}
+		const routeData = app.match(request);
+		Reflect.set(request, clientAddressSymbol, request.headers.get('x-forwarded-for'));
+		const response = await app.render(request, routeData);
+		if (app.setCookieHeaders) {
+			for (const setCookieHeader of app.setCookieHeaders(response)) {
+				response.headers.append('Set-Cookie', setCookieHeader);
 			}
-			return response;
 		}
-
-		return new Response(null, {
-			status: 404,
-			statusText: 'Not found',
-		});
+		return response;
 	};
 
 	return { default: handler };

packages/integrations/vercel/src/serverless/entrypoint.ts

@@ -23,12 +23,7 @@ export const createExports = (manifest: SSRManifest) => {
 			return res.end(err.reason || 'Invalid request body');
 		}
 
-		let routeData = app.match(request, { matchNotFound: true });
-		if (!routeData) {
-			res.statusCode = 404;
-			return res.end('Not found');
-		}
-
+		let routeData = app.match(request);
 		let locals = {};
 		if (request.headers.has(ASTRO_LOCALS_HEADER)) {
 			let localsAsString = request.headers.get(ASTRO_LOCALS_HEADER);