Using .NetFramework throw Unable to read data from the transport connection: The connection was closed. about downloader HOT 21 CLOSED

Hi @fengyuan213,

Thanks for reporting the issue.
I check your download URL and sample, but that's work correctly and I can download your files successfully! Of course, this link has some server-side problems such as disconnecting some times and I tested by some downloaders like IDM and all of them have this problem when downloading from.

And I check this link and our project works exactly with the ReadAsync command instead of the ReadToEnd, But I change some request options to improve the stability and after the test I released a new version.

from downloader.

@fengyuan213 I released a new version 1.0.9, please test that.

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Hello, I tested with the new version again just now. .The good news is that It can download succeed sometimes with parallel downloads option changed to false, however, When I try to download the file in parallel. Then it throws the same error at the download chunks method. However, I don't really think there is any server-side issues because the link I use to test download is from a known CDN network provider so... I checked with my link through IDM multi-thread downloading and it just works perfectly without any pieces of the issue. I have no idea why that is happening. Maybe it an idea to automatically retry to download the same chunk data if this exception occurred to try to avoid the issue.

Also, downloading sometimes stack. From the title bar of the console, it is able to see it's on 29.671% progress of downloading. The things are the progress never gets changed even for half an hour. Maybe regularly check if the download thread still alive...

Please help

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Update, the ParallelDownload = false option could let me download successful but it only for some time. There is a chance like 1/3 download failed and thows same exception as before. See picture belovw

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By the way, I am using WinForm in the Console Application by setting STAThread Attribute. Is that the case?

from downloader.

@fengyuan213 No, your application is fine and no problem. My downloader library has no dependency on your or any other project.
In this case, I have to work harder to find out why. If you have any information about this problem, be sure to mention it here.
Thanks

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Ok , Please update the version so I can test it.

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Today, I had another download issue with the same error message : Unable to read data from the transport connection: the connection was closed

The Client Instance hasn't disposed of it when downloading data.
It is very strange in this case because this function was worked perfectly.....The network section seems to be less stability when I changed the project to STAThread....

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Hello there, I have a super super good news, After I testing between net core and framework for lots of time. I figured it out why. The solution is so simple. When downloading chunkes, the downloader catches webexception and the following.
e.Source == "System.Net.Http" ||
e.Source == "System.Net.Sockets" ||
e.Source == "System.Net.Security" ||
e.InnerException is SocketException)
In the Framework I don't know how but "Unable to read data from the transport connection " is a part of IOException Instead of any of them above. Simplify just append "e is IOException" and problem solved. Please share your throughts becuase I am not too sure if it is a good way but it solved my problem.

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Also, The CacheInMemory =False mode is not working which means all downloads are forced to cacheinmemory

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@fengyuan213 Thank you for your follow-up. The IOException is very general and I can't catch that because maybe the exception has been caused for many reasons.
I have made changes to the source that I hope will solve your problems. You can see these changes in version 1.2.

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New version (1.2) released. Please test with that to sure solved this issue or not.
The caching mode also fixed in this version.

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@fengyuan213 have you tested this issue in the new version?

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Hello,
I tested the new version today. It is great to have a new feature like speed limit. However, the problem still exist......

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Hello, I think it is kinds of useful update...The post above uses Downloader.Sample's default configuration with KeepAlive=false
The error below occurs when I set to the KeepAlive opt = true.
Configuration:

Stacktrace:
" at System.IO.Stream.BeginReadInternal(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback callback, Object state, Boolean serializeAsynchronously)\r\n at System.IO.Stream.BeginRead(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback callback, Object state)\r\n at System.IO.Stream.<>c.b__43_0(Stream stream, ReadWriteParameters args, AsyncCallback callback, Object state)\r\n at System.Threading.Tasks.TaskFactory1.FromAsyncTrim[TInstance,TArgs](TInstance thisRef, TArgs args, Func5 beginMethod, Func`3 endMethod)\r\n at System.IO.Stream.BeginEndReadAsync(Byte[] buffer, Int32 offset, Int32 count)\r\n at System.IO.Stream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)\r\n at Downloader.DownloadService.d__45.MoveNext() in C:\Users\Fengyuan\source\repos\Downloader\src\Downloader\DownloadService.cs:line 285\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.GetResult()\r\n at Downloader.DownloadService.d__44.MoveNext() in C:\Users\Fengyuan\source\repos\Downloader\src\Downloader\DownloadService.cs:line 228"

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@fengyuan213 some servers does not support KeepAlive=true option, so I set default value to false.
In the first error, every time I check that, I could see no error! Is this the download link?
‍‍"http://resources.downloads.pokecity.club/2020.rar"

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Yep......

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The link above u might not able to download in your area.. try this one:
http://test.download.pokecity.club/2020.rar

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@fengyuan213 I released the new version v1.5.0. Please check this version. And if you have still this problem, please send me a complete exception data as TEXT or JSON to check exception source and types.
Thanks

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@fengyuan213 Was this problem solved with the new version?

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