在使用 websocket.lua 时遇到一个错误

[:00000014][error][.watchdog.service][2023-03-15 19:35:17]<@../src/ndgame/watchdog/handler.lua:310> websocket.accept err ../depends/skynet/lualib/http/websocket.lua:82: assertion failed! stack traceback: [C]: in function 'assert' ../depends/skynet/lualib/http/websocket.lua:82: in upvalue 'read_handshake' ../depends/skynet/lualib/http/websocket.lua:254: in function <../depends/skynet/lualib/http/websocket.lua:252> [C]: in function 'xpcall' ../depends/skynet/lualib/http/websocket.lua:412: in function 'http.websocket.accept' ../src/ndgame/watchdog/handler.lua:307: in function 'watchdog.handler.wsData' [C]: in function 'skynet.pcall' ../src/common/base/class.lua:15: in function <../src/common/base/class.lua:10> [C]: in function 'xpcall' ../src/common/base/dispatch.lua:61: in function 'dispatch.dispatchMessage' [C]: in function 'skynet.pcall' ../src/common/base/class.lua:15: in upvalue 'f' ../depends/skynet/lualib/skynet.lua:281: in function <../depends/skynet/lualib/skynet.lua:253>