SharePoint: Https WebClient Request occurred "The remote server returned an error: (401) Unauthorized"

Question

I had the below code in a SharePoint Webpart and it worked properly:

using (var wb = new WebClient())
{
    wb.UseDefaultCredentials = true;
    var data = wb.DownloadData(@"http://sharepointSite/_layouts/15/Resources/Stamps/image.png");
}

If I try to use https in browser like:

https://sharepointSite/_layouts/15/Resources/Stamps/image.png

After entering the credential I can download it:

but the problem is where I try to use https in my code:

 using (var wb = new WebClient())
{
    wb.UseDefaultCredentials = true;
    var data = wb.DownloadData(@"https://sharepointSite/_layouts/15/Resources/Stamps/image.png");
}

and I've got error:

The remote server returned an error: (401) Unauthorized.

Answer 1

I will give my two cents!

Not sure what SharePoint version this is ? On Premises or Cloud ?

Make sure the sharepoint account(the current user of the site) has access to this image. In your code after initialising WebClient , use webClient.UseDefaultCredentials = true;.

Also, prefix @ in front of the URL e.g. @"https://sharepointSite/_layouts/15/Resources/Stamps/image.png"

Let me know how you go.

Thanks Ravi