simplify the prev. commit
releng for 0.16
Merge branch 'kazuho/pr/9' (reduce rt_sig* syscalls)
releng for 0.17_01
change threshold for combining headers and body from 1024 bytes to 8192 (slightly faster if the client is running on the same machine, no unnecessary side-effects in performance)
releng for 0.18
reuse peer
suppress test-tcp warning
support HTTP/1.1