HTTP request execution handler can be used by client-side protocol handlers
to trigger the submission of a new HTTP request and the processing of an
HTTP response.
HTTP client handler implementation that allocates content buffers of limited
size upon initialization and is capable of controlling the frequency of I/O
events in order to guarantee those content buffers do not ever get overflown.
HTTP service handler implementation that allocates content buffers of limited
size upon initialization and is capable of controlling the frequency of I/O
events in order to guarantee those content buffers do not ever get overflown.