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const { serve, upgradeHttpRaw } = Deno;const u8 = Deno.core.encode("HTTP/1.1 101 Switching Protocols\r\n\r\n");
async function handler(req) {  const [conn, _firstPacket] = upgradeHttpRaw(req);  await conn.write(u8);  await conn.close();}
serve(handler, { hostname: "127.0.0.1", port: 9000 });