Csharp HttpContext. RequestAborted当Android APP失go 连接时未取消

i'm simulating this by disabling the wi-fi on the physical device)

This is not reliable client-side cancellation behavior.

What happens if the mobile client enters a no-network area while the file is being uploaded?

服务器定期发送keepalive探测器，以判断对等端是否仍在响应.如果对等体在预定时间内没有响应这些保活探测，系统会认为连接丢失.TCP保活间隔和重试次数通常是可配置的，但默认值可能导致在客户端失go 连接后数分钟到数小时内检测到断开连接.

Reliable solution

服务器应该在上传操作中添加超时机制，之后服务器将自动取消任务并处理上传的资源.

var cancellationTokenSource = new CancellationTokenSource();
// Set a timeout period, for example, 60 seconds
cancellationTokenSource.CancelAfter(TimeSpan.FromSeconds(60));

try
{
    await using var fileStream = IOFile.Create(filePath, bufferSize: 1024);
    // A linked CancellationToken is used here, which is canceled when the RequestAborted or timeout
    var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationTokenSource.Token, HttpContext.RequestAborted);

    await fileSection.FileStream?.CopyToAsync(fileStream, linkedTokenSource.Token);
}
catch (OperationCanceledException)
{
    //  Handle cancellations, such as deleting or saving partially uploaded files
}