The Application Layer on the server contains any software that provides a way of servicing requests from remote clients. This layer usually consists of Web Server software (e.g., Microsoft Internet Information Server, Netscape Enterprise Server, etc.) The server software is responsible for accepting HTTP requests and packaging HTML data into HTTP packets for submission back to the client-side application.
On the client, the layer consists of a browser or any software that can make requests to a Web Server and accept responses. The client-side software is responsible for packaging user requests (e.g., URLs, link clicks) and submitting them as HTTP requests to the server. The software also accepts HTTP packets from the server and extracts HTML, images, and applications for presentation and use in the client side Presentation Layer.
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