Return a 'connection: upgrade' in the upgrade path
Return a 'connection: upgrade' in the upgrade path

This is necessary in the case where h2o forwards the request to a
backend that does the upgrade

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