HttpBaseReadCopyToAsync(Stream, CancellationToken) 方法
            异步读取并复制流数据
            
命名空间: TouchSocket.Http程序集: TouchSocket.Http (在 TouchSocket.Http.dll 中) 版本:4.0.0-beta.143+5fcca7a4e70968794985dc3793adc50531308be6
public Task<Result> ReadCopyToAsync(
	Stream stream,
	CancellationToken cancellationToken = default
)
Public Function ReadCopyToAsync ( 
	stream As Stream,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Result)
member ReadCopyToAsync : 
        stream : Stream * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<Result> 
- stream  Stream
 - 需要读取并复制的流
 - cancellationToken  CancellationToken  (Optional)
 - 异步操作的取消令牌
 
TaskResult一个异步任务,表示复制操作的完成