TCP/TLS Connector: Ping

Read a CA Certificate from the file system

const caCert = await Deno.readTextFile("./root.pem");

Establish a connection to our TCP server using TLS that is currently being run on localhost port 443. We use a custom CA root certificate here. If we remove this option, Deno defaults to using Mozilla's root certificates.

const conn = await Deno.connectTls({
  hostname: "127.0.0.1",
  port: 443,
  caCerts: [caCert],
});

Instantiate an instance of text encoder to write to the TCP stream.

const encoder = new TextEncoder();

Encode the 'ping' message and write to the TCP connection for the server to receive.

await conn.write(encoder.encode("ping"));