code: func (crw *customResponseWriter) WriteHeader(code int) {
  	if crw.written {
  		LOGHANDLER.Warn(errMultiHeaderWrite)
  		return
  	}
  
  	crw.statusCode = code
  	crw.ResponseWriter.WriteHeader(code)
  }
docs: // WriteHeader is the interface implementation to get HTTP response code and add
  // it to the custom response writer