Add x-sneaker header with hostname

src/server.tsx

@@ -103,6 +103,7 @@ app.all("*", async c => {
     const raw = c.req.raw
     const headers: Record<string, string> = {}
     raw.headers.forEach((value, key) => { headers[key] = value })
+    headers['x-sneaker'] = url.hostname
     delete headers['host']
     delete headers['connection']
     delete headers['keep-alive']