ngx_http_send_header failed

[arty777]

2014/09/24 11:22:48 [alert] 26917#0: *814 close()ngx_http_send_header failed (11: Resource temporarily unavailable) while sending mp4 to client,
client: 178.216.153.161, server: vfs1.china-cdn88nmbwacdnln8hq8qwe.com, request: "GET /vkino0/kVrqDc7IZSvyRrdyxAfSfQ/1411575731/3914.ts?video=0&s
ecl=kVrqDc7IZSvyRrdyxAfSfQ&sect=1411575731 HTTP/1.1", host: "vfs1.china-cdn88nmbwacdnln8hq8qwe.com", referrer: "http://vkino.net/uppod.swf"

Why it's happend?

[arty777]

it's stability for ?video=0 , for each video.... issue?