Disable early longpoll headers for PhoenixMiner < 2.8.1
Disable early longpoll headers for PhoenixMiner < 2.8.1

Older versions of PhoenixMiner have some weird bug where they stop mining after receiving the response headers for a longpoll.
This is unfortunate, since chunked transfer encoding is the most reliable method to keep a connection open.
We detect these old clients, and wait to send any headers, hoping that TCP keepalive will do the job.

svasva/eloipool,imsaguy/eloipool,thrasher-/eloipool,ahmedbodi/SHA-Eloipool-MMCFE-,uingei/eloi,jameshilliard/4tar-eloipool,thrasher-/eloipool,wizkid057/eloipool,cinnamoncoin/eloipool-1,thrasher-/eloipool,uingei/eloipool,pointgaming/point-gaming-btc