This patch adds functionality to pass a pre-existing connection
as a bufferevent to `evhttp_connection_base_bufferevent_reuse_new`.
When the bufferevent has an existing fd, the evcon starts
in state `EVCON_IDLE` so that requests can be made immediately.
Signed-off-by: Kirill Rodriguez <theoden8@tutamail.com>
Signed-off-by: Kirill Rodriguez <theoden8@tutamail.com>
Co-authored-by: Wladimir J. van der Laan <laanwj@gmail.com>
Co-authored-by: Azat Khuzhin <a3at.mail@gmail.com>
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