使用nginx进行websocket反向代理会抛错

[chigco]

[:01000011] lua call [0 to :1000011 : 0 msgsz = 24] error : �[31m./skynet/lualib/skynet.lua:526: ./skynet/lualib/skynet.lua:156: ./skynet/lualib/skynet/socket.lua:253: assertion failed!
stack traceback:
[C]: in upvalue 'assert'
./skynet/lualib/skynet/socket.lua:253: in function 'skynet.socket.read'
(...tail calls...)
./build/lualib/websocket.lua:236: in function 'websocket.recv_frame'
./build/lualib/websocket.lua:212: in function 'websocket.recv'
./build/lualib/websocket.lua:341: in function 'websocket.start'
./service/wsgate/main.lua:57: in upvalue 'handle_socket'
./service/wsgate/main.lua:88: in field 'callback'
./skynet/lualib/skynet/socket.lua:105: in field '?'
./skynet/lualib/skynet/socket.lua:161: in upvalue 'f'
./skynet/lualib/skynet.lua:111: in function <./skynet/lualib/skynet.lua:105>
stack traceback:
[C]: in upvalue 'assert'
./skynet/lualib/skynet.lua:526: in function 'skynet.dispatch_message'�[0m

[h87070628]

local function accept_connection(header, check_origin, check_origin_ok)
dump( header, "YYYYYY", 9)

-- Upgrade header should be present and should be equal to WebSocket
if not header["upgrade"] or header["upgrade"]:lower() ~= "websocket" then
    return 400, "Can \"Upgrade\" only to \"WebSocket\"."
end

[h87070628]

应该是这里出问题了, nginx代理过来以后, 头没有upgrade