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The following special filenames may be used with the |& coprocess operator for creating TCP/IP network connections:
       /inet/tcp/lport/rhost/rport
       /inet4/tcp/lport/rhost/rport
       /inet6/tcp/lport/rhost/rport

#!/bin/sh

gawk -v ListeningPort=12345 'BEGIN {
  content="HTTP/1.1 200 OK\r\n"
  content=content "Content-Length: 12\r\n"
  content=content "Content-Type: text/plain; charset=utf-8\r\n\r\n"
  content=content "Hello World!"

  socket = "/inet/tcp/" ListeningPort "/0/0";
  while (1) {
    printf content |& socket;
  }
}'