C++14 or later is required to support completion tokens that use
per-operation return type deduction. For C++11, a completion
token's async_result specialisation must still provide the nested
typedef `return_type`.
`asio::coroutine` is an extension, which is not part of
the Networking TS, so the `net` alias is not appropriate in this case.
Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>
fix#38
This improves the behavior when encountering a short read:
* Any stream error encountered during a read is converting into
`http::error::partial_message` if some data was received but
the message is incomplete.
* Examples squelch SSL short read errors from the logs.
