Computer-implemented methods are provided for preparing an application for execution within an application execution environment and for running an application within an application execution environment. The computer-implemented methods create supplementary information for the application. The supplementary information includes an indication of a service request which is to be performed during execution of the application to obtain information from an application service. The computer-implemented methods retrieve the supplementary information for the application, and execute the application within the application execution environment. The methods perform the service request from the application execution environment independently from the execution of the application based on the supplementary information, and receive a response to the service request from the application service at the application execution environment. The method provides the response from the application execution environment to the application in response to a request from the application to perform the service request.