websocket错误 draft refuses handshakeFound

{“errMsg”:“draft refuses handshakeFound”};at socketTask.onerror callback function Error: {“errMsg”:“draft refuses handshakeFound”} at Function.

(https://usr/app-service.js:8048:2484)at Le.(https://lib/WAService.js:1:101885)at Le.emit (https://lib/WAService.js:1:323775)at https://lib/WAService.js:1:508506at https://lib/WAService.js:1:220983at Object.S (https://lib/WAService.js:1:1760)

非必现，暂未发现规律。