Method HttpClient():beforeSend() Foundation
Notifies the application when a request is about to be sent.
:beforeSend() --> self
:beforeSend() should return the object executing the method.
The callback method :beforeSend() is called automatically by the framework to indicate to the application that a request is about to be sent while processing a HTTP request initiated using :send() or :sendAsync(). The response is available through the HttpResponse object stored in the :HttpResponse member variable.
The :beforeSend() method implemented in the HTTP client class does nothing. It is introduced here for overriding in derived classes.
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