What pattern is exhibited by web applications in OutSystems during communication?

Web applications in OutSystems predominantly utilize the request-response pattern during communication. This pattern is foundational to how web applications operate: a client (typically a browser) sends a request to a server, and the server processes this request and sends back a response.

In the context of OutSystems, when a user interacts with the application, actions like clicking a button or submitting a form trigger requests to the server. The server then processes the request – which may include fetching or updating data, performing calculations, or executing business logic – and responds with the necessary data or confirmation of the action, which the client then uses to update the user interface.

This two-step mechanism ensures that there is a clear interaction flow, allowing for a structured way to handle user inputs and system outputs. The request-response pattern is essential for maintaining the statelessness of HTTP, where each request from a client is treated independently.

Other patterns, while they may also be present in various aspects of application architecture, do not define the fundamental communication method used in typical OutSystems web applications as effectively as the request-response pattern does.