nim ipv6 socket

试图用IPV6编写一个http服务，找了一圈资料，示例代码如下：

import std/[strformat, net]

# let socket = newSocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP)
let socket = newSocket(AF_INET6) # 这里的AF_INET6比较重要，socket可以在IPv4、IPv6上侦听
socket.bindAddr(Port(1234))
socket.listen()

# You can then begin accepting connections using the `accept` procedure.
var client: Socket
var address = ""
while true:
  socket.acceptAddr(client, address)
  let content = fmt"Client connected from: {address}"
  let len = len(content)
  let all = &"HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=utf-8\r\ncontent-length: {len}\r\n\r\n{content}"
  client.send(all)
  client.close()

经测试代码正确。