old_contents: # see http://docs.gunicorn.org/en/latest/configure.html#configuration-file
  
  from os import getenv
  
  bind = "0.0.0.0:{}".format(getenv("PORT", 8000))
  workers = int(getenv("WSGI_NUM_WORKERS", 2))
  threads = int(getenv("WSGI_NUM_THREADS", 4))
  worker_tmp_dir = getenv("WSGI_WORKER_TMP_DIR", "/dev/shm")
  accesslog = "-"
  errorlog = "-"
  loglevel = getenv("WSGI_LOG_LEVEL", "info")
  keepalive = int(getenv("WSGI_KEEP_ALIVE", 2))
  worker_class = getenv("GUNICORN_WORKER_CLASS", "gevent")
  reload = getenv("DEV", False)
  
new_contents: # see http://docs.gunicorn.org/en/latest/configure.html#configuration-file
  
  from os import getenv
  
  bind = "0.0.0.0:{}".format(getenv("PORT", 8000))
  workers = int(getenv("WSGI_NUM_WORKERS", 2))
  worker_tmp_dir = getenv("WSGI_WORKER_TMP_DIR", "/dev/shm")
  accesslog = "-"
  errorlog = "-"
  loglevel = getenv("WSGI_LOG_LEVEL", "info")
  keepalive = int(getenv("WSGI_KEEP_ALIVE", 2))
  worker_class = getenv("GUNICORN_WORKER_CLASS", "gevent")
  reload = getenv("DEV", False)
  
subject: Remove thread option.