Add demo (#4)

dev/test-proxy-server.ts

@@ -0,0 +1,46 @@
+/*
+ * Demo on how to proxy requests to the renderer with a given space ID and a base path.
+ */
+
+const spaceId = Bun.argv[2];
+const basePath = Bun.argv[3] ?? '';
+const port = 5000;
+
+if (!spaceId) {
+    throw new Error('Please provide a space id as an argument');
+}
+
+console.log(`Proxying space ${spaceId} on http://localhost:${port}/${basePath}`);
+
+Bun.serve({
+    port,
+    fetch: async (req) => {
+        const url = new URL(req.url);
+        const upUrl = isNextUrl(url)
+            ? `http://localhost:3000${url.pathname}`
+            : `http://localhost:3000/${spaceId}${url.pathname}`;
+
+        const headers = new Headers(req.headers);
+
+        headers.set('x-gitbook-host', url.host);
+        headers.set('x-gitbook-basepath', basePath);
+
+        const response = await fetch(upUrl, {
+            method: req.method,
+            headers: headers,
+            verbose: true,
+        });
+        const body = await response.text();
+
+        return new Response(body, {
+            status: response.status,
+            headers: {
+                'content-type': response.headers.get('content-type') || 'text/html',
+            },
+        });
+    },
+});
+
+function isNextUrl(url: URL) {
+    return url.pathname.startsWith('/_next/');
+}