/// <summary>
/// Gets the type of the MIME from the provided string.
/// </summary>
/// <param name="str">The filename or extension.</param>
/// <returns>The MIME type.</returns>
/// <exception cref="ArgumentNullException" />
public static string GetMimeType(string str)
{
return(MimeTypeMap.TryGetMimeType(str, out var result) ? result : DefaultMimeType);
}