Server Push
HTTP is a request-and-response protocol. Technically, there is no way to have the server to actively push data to the client. However, there are a few approaches to emulate push. They could be summarized to two approaches, client polling and comet[1], that are both supported.
Different approaches have different pros and cons, and we discuss them in the Configuration section.
No matter which implementation you choose, the use is the same. The Event Queue is the high-level API, and the suggested approach for its simplicity. However, if you prefer to access the low-level API directly, you could refer to the Synchronous Task and Asynchronous Task sections, which are two sets of low-level for tasks that can be executed either synchronously or asynchronously.
- ↑ More precisely, it is so-called long polling.