downloaditem totalbytes is 0

[Fantoom]

.NET 5, wpf

I have created a simple class which implements IDownloadHandler interface, and when I download a file, it downloads the file, but the TotalBytes property of downloaditem is 0. so I cant show the progress of download

[amaitland]

How does Chrome behave when you download the same url? Please include the exact version you are using.

If the response doesn't provide a content length header then the total bytes will be 0. This is a use case you should allow for as the header is optional.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Length