v0.12.17

Features

• error: add Error::is_connect method (01f64983)
• server:
  • add tcp_sleep_on_accept_errors builder method (a6fff13a, closes #1713)
  • add http1_half_close(bool) option (73345be6, closes #1716)
• service: export hyper::service::MakeServiceRef (a522c315)

Performance

• http1: implement an adaptive read buffer strategy which helps with throughput and memory management (fd25129d, closes #1708)