* Add `TcpUpstreamConnectionHandler` which can be used as standalone or as mixin
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* `TcpUpstreamConnectionHandler` is now an abstract class
* Fix mypy
* `nitpick_ignore` the `proxy.core.base.tcp_upstream.TcpUpstreamConnectionHandler` class
* Add mypy exception for now
* Fix flake
* Fix docstring
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
* Ensure pending buffers are flushed before shutting down in base_server.py
Handle unsupported scheme cases within connect_tunnel.py
* Move base implementations within core module
* Update ssl_echo_server
Abhinav Singh