JavaScript

<script src="~/Scripts/jquery-1.10.2.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/tabulator/4.4.3/js/tabulator.min.js"></script>
     <link href="https://nightly.datatables.net/css/jquery.dataTables.css" rel="stylesheet" type="text/css" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
     <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>
    <script type="text/javascript" src="https://cdn.datatables.net/1.10.16/js/jquery.dataTables.min.js"></script>
    <script src="~/Scripts/jquery.signalR-2.1.1.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/tabulator/4.4.3/css/bootstrap/tabulator_bootstrap.min.css" rel="stylesheet" />

Member 14695956 wrote:

<script src="/Scripts/jquery-1.10.2.js"></script>

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>

var Game = function(settings) {
    ... 

    this.quitGame = function(settings) {
        ...
    }
};

var settings = "blablah";
var game = new Game(settings);
...
game.quitGame(settings);

Richard Deeming wrote:
To read this from Javascript, either the image will need to be on the same domain as your page, or the remote domain will need to set the CORS headers to allow your site to request the image.

public static async Task<string> GetContentType(HttpClient client, string url)
{
    if (string.IsNullOrEmpty(url)) throw new ArgumentNullException(nameof(url));
    if (!Uri.TryCreate(url, UriKind.Absolute, out var uri)) throw new ArgumentException("Invalid URL", nameof(url));
    
    using (var request = new HttpRequestMessage(HttpMethod.Head, uri))
    using (var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead))
    {
        response.EnsureSuccessStatusCode();
        return response.Content.Headers.ContentType.MediaType;
    }
}