Load AJAX requests sequentially

I want to load content with "jQuery AJAX" from a server side PHP itemscript.php inside a tooltip.

Only two AJAX requests are loaded correctly. All other AJAX requests are failing and the console shows the following error:

Failed to load resource: net::ERR_CONNECTION_CLOSED

The problem seems to be that the AJAX requests are being executed parallel and the server can´t process them correctly.

I´ve set up a test page for a better understanding (look in the consoles´ network tab): Testpage

If i use async:false it works correctly. Since async shouldn´t be used I search a solution how to execute these AJAX requests sequentially.

This is my code:

    $(document).ready(function () {

        $('head').append('<link rel="stylesheet" type="text/css" href="https://code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">');

            jQuery(function ($) {

                $('*[data-id]').each(function () {
                    let $tooltip = $(this);
                    let id = $tooltip.attr("data-id");
                    let itemlevel = $tooltip.attr("itemlevel")

                        url: "../datenbank/itemscript.php",
                        type: "GET",
                        data: {
                            "var": id,
                            "itemlevel": itemlevel

                    }).then(function (data) {

                        let $content = $(data);
                        let title = $content.siblings('[class^=item-title]').text()
                        let icon = $content.siblings('[class^=parent2]').html()

                        var item_title = $content.siblings('div[class*="item-title"]');
                        var ClassName = '';
                        var classes = item_title.attr('class').split(/(\s+)/);
                        $.each(classes, function (i, v) {
                            v = v.trim();
                            if (v.indexOf('item-title') > -1) {
                                ClassName = v;

                            tooltipClass: "tooltipitem",
                            content: data,
                            position: {
                                my: "left+153 top+20",
                                collision: "flipfit"


                        $('*[data-id]').attr("href", "../item" + ClassName + "")

                        $('*[data-id]').attr("title", "=")

                        $("<div class=\"" + ClassName + "\"><img class='icon-small' src='../images/icons/" + icon + "'/>" + title + "</div>").appendTo($tooltip);




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