Abstract: The application relates to a method for determining page impression in a client-server system, the method comprising opening a page in a browser running on a client device provided in the client-server system, starting an application in the browser in response to the opening of the webpage, establishing a persistent connection between the web browser on the client device and a server device provided in the client-server system, storing first electronic information in the server device, the first information indicating a start time for establishing the persistent connection, keeping the persistent connection, in the server device, receiving termination information indicating termination of the persistent connection, storing second electronic information in the server device, the second information indicating an end time for terminating the persistent connection, and determining an opening or presentation time from the first and second electronic information, the opening or presentation time indicating the time

Abstract: The present disclosure refers to a method in a client-server network, comprising: generating, in a client, a setting request for setting an entity tag in a server; receiving the setting request in the server; generating the entity tag in the server, the generating comprising providing a user identification in the server and including the user identification in the entity tag; generating a response to the setting request in the server, the response comprising the entity tag provided in an entity tag field of the response; receiving the response in the client; caching the entity tag in the client; generating, in the client, a content request for retrieval of content provided in a resource in the client-server network and identified by a resource locator, the generating comprising including the resource locator and the entity tag in the content request; and transmitting the content request from the client to the resource. Also, a client-server network is provided.

Abstract: The application relates to a method for determining page impression in a client-server system, the method comprising opening a page in a browser running on a client device provided in the client-server system, starting an application in the browser in response to the opening of the webpage, establishing a persistent connection between the web browser on the client device and a server device provided in the client-server system, storing first electronic information in the server device, the first information indicating a start time for establishing the persistent connection, keeping the persistent connection, in the server device, receiving termination information indicating termination of the persistent connection, storing second electronic information in the server device, the second information indicating an end time for terminating the persistent connection, and determining an opening or presentation time from the first and second electronic information, the opening or presentation time indicating the time

Abstract: Computer-implemented method, comprising the steps of running a web browser application on a computer system and signaling whether a part of a web page is visible to a user within a browser viewport of a browser window on a screen of a display device of the computer system, wherein the part is loaded inside an inline frame of the web page, the step of signaling comprising: determining position data indicative of positional information on a position of the inline frame on the screen, determining rendering data indicative of rendering information on processes of rendering the inline frame by the web browser application, determining whether the part of the web page is located within the browser viewport, based on the position data and the rendering data, and outputting a visibility signal for the part of the web page, if yes. Further, the application contains a method for monitoring whether a part of a web page is visible to a user and a device or signaling whether a part of a web page is visible to a user.