code: private CreateRouteTableResponseType createRouteTable(final String vpcId,
              final String cidrBlock) {
          CreateRouteTableResponseType ret = new CreateRouteTableResponseType();
          ret.setRequestId(UUID.randomUUID().toString());
          MockRouteTable mockRouteTable = mockRouteTableController.createRouteTable(cidrBlock, vpcId);
  
          RouteTableType routeTableType = new RouteTableType();
          routeTableType.setVpcId(mockRouteTable.getVpcId());
          routeTableType.setRouteTableId(mockRouteTable.getRouteTableId());
  
          ret.setRouteTable(routeTableType);
          return ret;
      }
docs: Handles "createRouteTable" request to create routetable and returns response with a route table.
  @param vpcId vpc Id for Route Table.
  @param cidrBlock VPC cidr block.
  @return a CreateRouteTableResponseType with our new route table in  (or if not
  overridden, as defined in aws-mock-default.properties)