How to debug ajax error?

Question

JavaScript

Hello! There is such a url city-afisha.com/Events/Event/2848

script on this page:

var t = '';
    function gText(e) {
        t = (document.all) ? document.selection.createRange().text : document.getSelection().toString();




        if (t.length > 30) {
            $.ajax({
                url: '@Url.Action("LgVr", "Utils")',
                type: 'POST',
                cache: false,
                traditional: true,
                data: {
                    id: '@Model.Event_Id',
                    title: '@Model.Title'
                }
            });
        } //  if (t.length >

    }

    document.onmouseup = gText;
    if (!document.all) document.captureEvents(Event.MOUSEUP);

that is, when copying, or rather, selecting, there is a post request with some info. I don't understand how to debug this error...? it doesn't reach the controller if you set a breakpoint in the studio... you have to look for the error longer, by typing.

Answer 1

Turn off error handling (in web.config and filters) and see what the problem is.
The scientific poke method says that the problem is in the encoded data (highlighted in bold):

%26%23171%3B => «
%26%23187%3B => »