回调：OnHeadersCallback

🌐 Callback: OnHeadersCallback

• this quic.QuicStream
• headers <Object> 带有小写字符串键和字符串或字符串数组值的头对象。

在接收到初始请求或响应头时调用。对于 HTTP/3，这会在服务器端传递请求伪头，在客户端传递响应头。

🌐 Called when initial request or response headers are received. For HTTP/3, this delivers request pseudo-headers on the server and response headers on the client.