Sending 1 request per second still showing exception

Hello sir
can you help for the error
i am using ajax to fetch live data
i am using getLTP function to send request .

i am fetching data per second but showing me some time to many request thrown.
\

please check the screenshoots and codes.

these is the jquery code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> 
<script type="text/javascript">
                                function txtdisplay(){
                                    $.ajax({
                                        type: "POST",
                                        url:"ajax.php",
                                        data:"data1=get",
                                        success:function(html){
                                            $("#currentprice").html(html);
                                        }
                                    });
                                }
                                setInterval(function(){
                                    txtdisplay();
                                },1000);
                                    
</script>
<div id="currentprice"></div>



<img src="https://kite.trade/forum/uploads/editor/vx/bom08w7ccijc.png" alt="" />
<img src="https://kite.trade/forum/uploads/editor/1q/3n3a9qz455is.png" alt="" />

both files i have attached can you please help me for that.
thanks