I have been working on a user interface for customers to upload content to a server for some processing. Users may even have to upload large files and both the upload and the processing may take time. I came across an interesting jquery plugin for the purpose of showing a progress bar.
The jQuery-File-Upload plugin gives an example as follows:
$(function () {
    $('#fileupload').fileupload({
        dataType: 'json',
        done: function (e, data) {
            $.each(data.result.files, function (index, file) {
                $('<p/>').text(file.name).appendTo(document.body);
            });
        }
    });
});

The upload progress bar is indicated this way:
$('#fileupload').fileupload({
     :
    progressall: function (e, data) {
        var progress = parseInt(data.loaded / data.total * 100, 10);
        $('#progress .bar').css(
            'width',
            progress + '%'
        );
    }
});

Notice that the function depends on data and this notion can be borrowed to the server side where given a request id, the server can indicate progress
function updateProgress() {
        if (stopProgressCheck) return;
        var webMethod = progressServiceURL + "/GetProgress";
        var parameters = "{'requestId':'" + requestId + "'}";

        $.ajax({
            type: "POST",
            url: webMethod,
            data: parameters,
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (msg) {
                if (msg.d != "NONE") { //add any necessary checks
                    //add code to update progress bar status using value in msg.d
                    statusTimerID = setTimeout(updateProgress, 100); //set time interval as required
                }
            },
            error: function (x, t, m) {
                alert(m);
            }
       }); 
    }
Courtesy : https://stackoverflow.com/questions/24608335/jquery-progress-bar-server-side
The alternative to this seems to be to use the HTTP status code for 102 processing.
#application : https://1drv.ms/w/s!Ashlm-Nw-wnWtkN701ndJWdxfcO4