code: func sendBody(url string, header http.Header) bool {
  	// Skip body for auth endpoint
  	if strings.HasSuffix(url, "/auth") {
  		return false
  	}
  
  	// body is sent only for text or json messages
  	contentType, _, err := mime.ParseMediaType(header.Get("Content-Type"))
  	if err != nil {
  		return false
  	}
  
  	return contentType == "application/json"
  }
docs: // sendBody returns true when request/response body should be sent to AuthZPlugin