Update README and small fix for error handling in server

Author: just-shadyumbrella

README.md

@@ -1,6 +1,6 @@
 # Vite + Solid ~ Rollup + Fastify
 
-A simple example to develop front-end app with Vite and SolidJS, as well as Fastify back-end support through Vite's [`server.proxy`](https://vite.dev/config/server-options#server-proxy) [config](./vite.config.ts#L12) and bundled with Rollup.
+A simple example to develop front-end app with Vite and SolidJS, as well as Fastify back-end support through Vite's [`server.proxy`](https://vite.dev/config/server-options#server-proxy) [config](./vite.config.ts#L15) and bundled with Rollup.
 
 ## Usage
 
@@ -35,7 +35,7 @@ npm run build:server
 
 You can now serve the production build with `npm run preview`. Or just run `node .` at [`dist`](./dist/index.js) folder, it's generally fully portable and minified by `esbuild`. You can adjust the build output by editing the [`vite.config.ts`](./vite.config.ts) file for front-end and [`rollup.config.ts`](./rollup.config.ts) for back-end.
 
-The API endpoint also works alongside [Solid Router](https://docs.solidjs.com/solid-router), including 404 and 500 error pages. Check out [`src/client/index.tsx`](./src/client/index.tsx#L23) and see how the Fastify server handles SPA requests in [`src/server/index.ts`](./src/server/index.ts#L33).
+The API endpoint also works alongside [Solid Router](https://docs.solidjs.com/solid-router), including 404 and 500 error pages. Check out [`src/client/index.tsx`](./src/client/index.tsx#L23) and see how the Fastify server handles SPA requests in [`src/server/index.ts`](./src/server/index.ts#L34).
 
 ### Learn more on the [Solid Website](https://solidjs.com) and come chat with us on our [Discord](https://discord.com/invite/solidjs)
 

src/server/index.ts

@@ -39,11 +39,16 @@ app.setNotFoundHandler((request, reply) => {
   }
 })
 
-app.setErrorHandler((error, _, reply) => {
-  reply
-    .status(error?.statusCode || 500)
-    .header('Content-Type', 'text/html')
-    .send(fallback)
+app.setErrorHandler((error, request, reply) => {
+  if (probablyBrowser(request.headers)) {
+    reply
+      .status(error?.statusCode || 500)
+      .header('Content-Type', 'text/html')
+      .send(fallback)
+  } else {
+    reply.status(error?.statusCode || 500).send('Server fault')
+    console.error(error)
+  }
 })
 
 // Not must be `/api`, don't forget to update `vite.config.ts`'s `server.proxy`