public class MimeController : Controller {
        public IActionResult Index() {
            using (var rs = WebRequest.Create("http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types")
                .GetResponse().GetResponseStream()) {
                if (rs == null) return null;
                var sr = new StreamReader(rs, Encoding.UTF8);
                var content = sr.ReadToEnd();
                var arr = content.Split("\n");
                var sb = new StringBuilder();
                foreach (var s in arr) {
                    if (s.StartsWith("#"))
                        continue;
                    var kv = s.Split("\t").Where(c => !string.IsNullOrEmpty(c)).ToArray();
                    if (kv.Length == 2)
                        sb.AppendLine($"\"{kv[1]}\",\"{kv[0]}\"");
                }
                sr.Close();
                return Content(sb.ToString());
            }
        }
    }