问Jquery，Ajax (失败) net::ERR_CONNECTION_REFUSED

EN

class testHTTPServer_RequestHandler(BaseHTTPRequestHandler):
    def do_POST(self):
        self.send_response(200)
        self.send_header('Content-type','application/json; charset=utf-8')
        self.send_header('Access-Control-Allow-Origin', 'http://localhost')
        self.end_headers()
        content_length = int(self.headers['Content-Length'])
        body = self.rfile.read(content_length)
        parsed_q = urlparse(self.path)
        parsed_b = urlparse(body.decode("utf-8"))
        search_info = urllib.parse.parse_qs(parsed_q.query)
        user_info = urllib.parse.parse_qs(parsed_b.path)
        luk = ''.join(search_info['search'])
        wer = ''.join(search_info['parde'])
        user_id = ''.join(user_info['user'])
        self.wfile.write(bytes(where_to(luk, wer, user_id), "utf8"))
        return

    def do_GET(self):
        print ("get request...")
        self.send_response(200)
        self.send_header('Content-type','text/html; charset=utf-8')
        self.send_header('Access-Control-Allow-Origin', '*')
        self.end_headers()
        message = "Nothing to see here."
        self.wfile.write(bytes(message, "utf8"))
        return

else{
    $(".peenum").html("");
    $(".cont_row").html("");
    $('.progress-bar').css({"width": "0%"})
    var dat = Cookies.get()
    $(".where").each(function(){
        var url = 'http://localhost:8081/?search='+$("#enter_look_for").val()+'&parde='+$(this).val();
        $.ajax({
            url: url,
                method: "POST",
                data: dat,
                success: pajiehali
        });
    });
}