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Loop handlers
=============
Purpose
-------
Loop handlers are a special kind of HTTP handlers used when the
response can not be sent right away. The handler enters instead
a receive loop waiting for the right message before it can send
a response.
They are most useful when performing long-polling operations or
when using server-sent events.
Callbacks
---------
@todo Describe the callbacks.
Usage
-----
@todo Explain how to use them.
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