fix: handle non-prefixed routes on the production server

Dockerfile

@@ -13,11 +13,10 @@ RUN pnpm prune --prod
 FROM node:20-alpine
 WORKDIR /app
 COPY --from=build /app/build /app/build
-COPY --from=build /app/server.mjs /app/server.mjs
 COPY --from=build /app/node_modules /app/node_modules
 RUN echo '{"type":"module"}' > /app/package.json
 
 EXPOSE 3000
 ENV NODE_ENV=production
 ENV HOST=0.0.0.0
-CMD [ "./server.mjs" ]
+CMD [ "node", "./build/headplane/server.js" ]

server.mjs

@@ -55,13 +55,32 @@ const handler = remixRequestHandler(build, 'production')
 const http = createServer(async (req, res) => {
 	const url = new URL(`http://${req.headers.host}${req.url}`)
 
+	if (!url.pathname.startsWith(PREFIX)) {
+		res.writeHead(404)
+		res.end()
+		return
+	}
+
+	// We need to handle an issue where say we are navigating to $PREFIX
+	// but Remix does not handle it without the trailing slash. This is
+	// because Remix uses the URL constructor to parse the URL and it
+	// will remove the trailing slash. We need to redirect to the correct
+	// URL so that Remix can handle it correctly.
+	if (url.pathname === PREFIX) {
+		res.writeHead(302, {
+			Location: `${PREFIX}/`
+		})
+		res.end()
+		return
+	}
+
 	// Before we pass any requests to our Remix handler we need to check
 	// if we can handle a raw file request. This is important for the
 	// Remix loader to work correctly.
 	//
 	// To optimize this, we send them as readable streams in the node
 	// response and we also set headers for aggressive caching.
-	if (url.pathname.startsWith(`${PREFIX}assets/`)) {
+	if (url.pathname.startsWith(`${PREFIX}/assets/`)) {
 		const filePath = join(baseDir, url.pathname.replace(PREFIX, ''))
 		const exists = existsSync(filePath)
 		const stats = statSync(filePath)

vite.config.ts

@@ -6,9 +6,9 @@ import tsconfigPaths from 'vite-tsconfig-paths'
 
 installGlobals()
 
-const prefix = process.env.__INTERNAL_PREFIX || '/admin/'
-if (!prefix.endsWith('/')) {
-	throw new Error('Prefix must end with a slash')
+const prefix = process.env.__INTERNAL_PREFIX || '/admin'
+if (prefix.endsWith('/')) {
+	throw new Error('Prefix must not end with a slash')
 }
 
 export default defineConfig(({ isSsrBuild }) => {
@@ -43,11 +43,11 @@ export default defineConfig(({ isSsrBuild }) => {
 	}
 
 	return ({
-		base: prefix,
+		base: `${prefix}/`,
 		build: isSsrBuild ? { target: 'ES2022' } : {},
 		plugins: [
 			remix({
-				basename: prefix,
+				basename: `${prefix}/`,
 			}),
 			tsconfigPaths(),
 			babel({