mod.ts

// deno run --allow-net  mod.ts

/**
 * helloworld HTTP服务
 * @param opts {Deno.ListenOptions}
 */
async function simpleServer(opts: Deno.ListenOptions): Promise<void> {
  // 创建TCP服务
  const listener: Deno.Listener = Deno.listen(opts) as Deno.Listener;
  console.log("listening on", `${opts.hostname}:${opts.port}`);
  // 死循环监听TCP请求
  while (true) {
    // 等待TCP连接
    const conn: Deno.Conn = await listener.accept();
    // 执行响应
    const CRLF = "\r\n";
    const bodyStr = "hello world!";
    const res = [
      `HTTP/1.1 200`,
      `content-length: ${bodyStr.length}`,
      ``,
      `${bodyStr}`
    ].join(CRLF);
    // 将HTTP报文字符串转成 二进制数据流
    const encoder = new TextEncoder();
    // 将HTTP二进制数据流写入TCP连接
    await conn.write(encoder.encode(res));
    conn.close();
  }
}
simpleServer({
  hostname: "127.0.0.1",
  port: 3001,
});