In my ASP.NET MVC application I'm reading an external file from URL and saving it into a directory on my server. I do this in a loop for every few seconds to have actual data if the file was modified.
What I need is to recognize that the LastWrittenTime of the file accessed via the URL is different from file already downloaded to the server. I cannot use FileInfo class because "URI formats are not supported".
So how do I get the last written time of the file from the URL without needing to download the full file for every loop?