Asynchronous RESTful web services

All the discussions on RESTful web services that we have had so far were based on the synchronous request and response model. When a client invokes a RESTful web API synchronously, the server keeps the request handling thread engaged till its request is processed. In this case, the entire request is processed in a single thread on the server. This model works if the request processing is finished quickly. The problem starts when a request takes more time to finish. In such a case, the thread used by the container to handle the long-running request will remain busy till the processing is over. This may adversely affect the scalability of the application when the load (concurrent requests) increases because ...

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