code: public static String getServiceRequestHeaderIfAny(final HttpServletRequest context) {
          if (context == null) {
              return null;
          }
          var id = context.getHeader(CasProtocolConstants.PARAMETER_SERVICE);
          if (StringUtils.isBlank(id)) {
              id = context.getHeader("X-".concat(CasProtocolConstants.PARAMETER_SERVICE));
          }
          return id;
      }
docs: Gets service request header if any.
  
  @param context the context
  @return the service request header if any