Make Deno SSR Serve Custom 404 Pages

.changeset/sharp-brooms-drum.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/deno': patch
+---
+
+Make Deno SSR Backend Render Custom 404 Pages

packages/integrations/deno/src/server.ts

@@ -28,10 +28,22 @@ export function start(manifest: SSRManifest, options: Options) {
 			Reflect.set(request, Symbol.for('astro.clientAddress'), ip);
 			return await app.render(request);
 		}
-
+
+		// If the request path wasn't found in astro,
+		// try to fetch a static file instead
 		const url = new URL(request.url);
 		const localPath = new URL('.' + url.pathname, clientRoot);
-		return fetch(localPath.toString());
+		const fileResp = await fetch(localPath.toString());
+
+		// If the static file can't be found
+		if (fileResp.status == 404) {
+		    // Render the astro custom 404 page
+		    return await app.render(request);
+
+		// If the static file is found
+		} else {
+		    return fileResp;
+		}
 	};
 
 	const port = options.port ?? 8085;