Developing web applications is difficult since the client-server relationship is asymmetric: the server cannot update clients but only responds to client requests and the navigation facilities of web browsers lead to a situation where servers cannot control the state of the clients. Page-centric web application frameworks fail to offer adequate solutions to model control flow at a high-level of abstraction. Developers have to work manually around the shortcomings of the HTTP protocol. Some approaches offer better abstractions by composing an application out of components; however they still fail to offer modeling control flow at a high level. Continuation-based approaches solve this problem by providing the facilities to model a control flow over several pages with one piece of code.
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