public IPackageRepository FromUserInput(string userInput, NetworkCredential credentials = null)
        {
            bool found     = false;
            var  targetUri = userInput.ToUri();

            if (targetUri == null ||
                targetUri.IsAbsoluteUri == false ||
                !(targetUri.Scheme.EqualsNoCase("http") || targetUri.Scheme.EqualsNoCase("https")))
            {
                return(null);
            }

            if (!targetUri.Segments.Last().EqualsNoCase("index.wraplist"))
            {
                targetUri = targetUri.EnsureTrailingSlash().Combine("index.wraplist");
            }
            _client.Head(targetUri)
            .Credentials(credentials)
            .Handle(200, _ => found = true)
            .Send();
            var repository = GetIndexedRepository(targetUri);

            if (credentials != null)
            {
                repository = new PreAuthenticatedRepository(repository, repository.Feature <ISupportAuthentication>(), credentials);
            }
            return(found ? repository : null);
        }
        public IPackageRepository FromUserInput(string userInput, NetworkCredential credentials = null)
        {
            bool found = false;
            var targetUri = userInput.ToUri();
            if (targetUri == null ||
                targetUri.IsAbsoluteUri == false ||
                !(targetUri.Scheme.EqualsNoCase("http") || targetUri.Scheme.EqualsNoCase("https")))
                return null;

            if (!targetUri.Segments.Last().EqualsNoCase("index.wraplist"))
                targetUri = targetUri.EnsureTrailingSlash().Combine("index.wraplist");
            _client.Head(targetUri)
                                 .Credentials(credentials)
                                 .Handle(200, _ => found = true)
                                 .Send();
            var repository = GetIndexedRepository(targetUri);
            if (credentials != null)
                repository = new PreAuthenticatedRepository(repository, repository.Feature<ISupportAuthentication>(), credentials);
            return found ? repository : null;
        }