您需要将有效数据自行保存。该方法可能会多次调用。
void IBigUnfixedHeaderRequestInfo.OnAppendBody(
	ReadOnlySpan<byte> buffer
)Private Sub OnAppendBody ( 
	buffer As ReadOnlySpan(Of Byte)
) Implements IBigUnfixedHeaderRequestInfo.OnAppendBodyprivate abstract OnAppendBody : 
        buffer : ReadOnlySpan<byte> -> unit 
private override OnAppendBody : 
        buffer : ReadOnlySpan<byte> -> unit [缺少 "M:TouchSocket.Http.WebSockets.WSDataFrame.TouchSocket#Core#IBigUnfixedHeaderRequestInfo#OnAppendBody(System.ReadOnlySpan{System.Byte})" 的 <param name="buffer"/> 文档]