use `error_io` when encountering error while waiting for headers, as `eos` indicates arrival of a headers-only response
use `error_io` when encountering error while waiting for headers, as `eos` indicates arrival of a headers-only response

yannick/h2o,cwyang/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,devnexen/h2o,cwyang/h2o,yannick/h2o,yannick/h2o,devnexen/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,devnexen/h2o