code: protected boolean hasKey() {
          boolean result = false;
          String requestURI = this.request.getUri();
          parseKeys(requestURI);
  
          if(this.parsedKeys != null) {
              result = true;
          } else {
              logger.error("Error when validating request. No key specified.");
              RestErrorHandler.writeErrorResponse(this.messageEvent,
                                                  HttpResponseStatus.BAD_REQUEST,
                                                  "Error: No key specified !");
          }
          return result;
      }
docs: Retrieve and validate the key from the REST request.
  
  @return true if present, false if missing