code: func bodyAllowedForStatus(status int) bool {
  	switch {
  	case status >= 100 && status <= 199:
  		return false
  	case status == 204:
  		return false
  	case status == 304:
  		return false
  	}
  	return true
  }
docs: // copied from http2/http2.go
  // bodyAllowedForStatus reports whether a given response status code
  // permits a body. See RFC 2616, section 4.4.