code: public void setCrumbRequestField(String requestField) {
          if (Util.fixEmptyAndTrim(requestField) == null) {
              crumbRequestField = CrumbIssuer.DEFAULT_CRUMB_NAME;
          } else {
              crumbRequestField = requestField;
          }
      }
docs: Set the request parameter name. Must not be null.
  
  @param requestField