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Whenever a RequestHandler class is called we instantiate it with the request.
Then we call handle on the instance. This way we can access the request and
its content via accessors rather than only in the handle method.
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Instead of testing the preconditions for each handler in the dispatcher
the dispatcher hands a request to one handler after the other until one of
them responds.
This is similar to the Chain of Responsibility patter but we iterate over the
'handler_chain' array instead of a linked list.
To change the order of handlers or add other handlers change the array in the
handler_chain function.
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Now we have a Dispatcher and two ResponseHandlers that have the same interface.
Moving towards a Chain of Responsibility pattern.
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