Error: Unexpected server response: 404 Handshake Details Request URL: demo-futureskraken (ссылку поменял,

Question

Error: Unexpected server response: 404 Handshake Details Request URL: demo-futureskraken (ссылку поменял,

чтобы сообщение не удалили)
Request Method: GET
Status Code: 404 Not Found
Request Headers
Sec-WebSocket-Version: 13
Sec-WebSocket-Key: tzK6UFTi7BXll/upSctS/Q==
Connection: Upgrade
Upgrade: websocket
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
Host: demo-futures.kraken.com
Response Headers
Date: Sun, 14 Nov 2021 12:36:37 GMT
Content-Length: 0
Connection: keep-alive
Access-Control-Allow-Credentials: true
Access-Control-Expose-Headers: Content-Disposition
Cache-Control: no-store
Vary: Origin
CF-Cache-Status: DYNAMIC
Expect-CT: max-age=604800, report-uri="/cdn-cgi/beacon/expect-ct" (тут тоже поменял)
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=3NCl6hOBlL0fUqxB1mksaOY3PhL8XG6Usr0Ked68T3%2FmLR10bjULtGyoyQTncd%2FRPmmnfLfYI8I2W4mJxiP9MxSzefHj2ZHkgcuYRlXWn8AwhPnCoHwhD5cn8SCiQoRCf%2F5SC75uHC%2Fjrw%3D%3D"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
Server: cloudflare
CF-RAY: 6ae049526e824d8c-DME
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400, h3-28=":443"; ma=86400, h3-27=":443"; ma=86400