#include <err.h> /* err(3) */
#include <stdlib.h> /* EXIT_xxxx */
#include <stdio.h> /* puts(3) */
#include <unistd.h> /* pledge(2) */

int
main(void)
{
  if (pledge("stdio", NULL) == -1)
    err(EXIT_FAILURE, "pledge");
  puts("Status: 200 OK\r");
  puts("Content-Type: text/html\r");
  puts("\r");
  puts("Hello, world!\n");
  return EXIT_SUCCESS;
}