Sec-WebSocket-Accept
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Sec-WebSocket-Accept 头（header）用在 websocket 开放握手中。它会出现在响应头中。也就是说，这是由服务器发送到客户端的头（header），用以告知服务器愿发起一个 websocket 连接。
Browser compatibility
BCD tables only load in the browser