404 Not Found

<?php 
 header('Access-Control-Allow-Origin: *'); 
require_once('admin/dbconnection.php');
error_reporting(0);
$action = $_POST['action'];
$ref = $_POST['referer'];

if($ref=='ezioaws')
{

if($action=='add_enquiry')
    {
        $name = $con -> real_escape_string($_POST['name']);
        $email = $_POST['email'];
        $mobile = $_POST['mobile'];
        $company = $con -> real_escape_string($_POST['company']);
        $country = $con -> real_escape_string($_POST['country']);
        $pincode = $_POST['pincode'];
        $product = $con -> real_escape_string($_POST['product']);
        $message = $_POST['message'];
        $page = $con -> real_escape_string($_POST['page']);
        $dates = date("Y-m-d");

$sqlinsert = "INSERT INTO contact (name,email,phone,company,country,pincode,product_name,message,source,created_at) VALUES ('$name','$email','$mobile','$company','$country','$pincode','$product','$message','$page','$dates')";
                                    
        $sqlinsertres = mysqli_query($con, $sqlinsert);

require "mailer/PHPMailerAutoload.php";

$mail = new PHPMailer;
            $mail->IsSMTP();
            $mail->Host = 'smtp.hostinger.com';                 // Specify main and backup server
            $mail->Port = 465;                                    // Set the SMTP port
            $mail->SMTPAuth = true;                               // Enable SMTP authentication

$mail->Username = 'contact@stengineers.com';                // SMTP username
            $mail->Password = 'Contact@ST24';                  // SMTP password
            $mail->SMTPSecure = 'ssl';                            // Enable encryption, 'ssl' also accepted

$mail->setFrom('contact@stengineers.com',"S&T Engineers - Enquiry");
            $mail->AddAddress('onlinesupport@stengineers.com', "S&T Engineers - Enquiry");  // Add a recipient

$mail->IsHTML(true);                                  // Set email format to HTML

$mail->Subject = "Good news! S&T Engineers - Enquiry";
 
 $mail->Body = "Hi, A new Enquiry has been Submitted. Name: $name 
 Email: $email Phone Number: $mobile Company: $company Country: $country Pin Code: $pincode 
 Product: $product Message: $message Take care, Team, S&T Engineers! ";

if(!$mail->send()) {
               $json['message']= "We were unable to send your request.Please try again";
               $json['status']= "Failed";
               
            }
            else
            {
                $json['message']= "Your request has been sent successfully";
                $json['status']= "Success";
            
            }
            echo json_encode($json);
        
    }
 
}
else
{
    echo "Access Denied";
}

if($ref=='ezioaws')
{

if($action=='addsubscribe')
    {
       
        $email = $_POST['email'];

require "mailer/PHPMailerAutoload.php";

$mail->setFrom('contact@stengineers.com',"S&T Engineers - Subscribe");
            $mail->AddAddress('onlinesupport@stengineers.com', "S&T Engineers - Subscribe");  // Add a recipient
            $mail->IsHTML(true);                                  // Set email format to HTML

$mail->Subject = "Good news! S&T Engineers - Enquiry";
 
 $mail->Body = "Hi, A new Subscribe has been Submitted. 
 Email: $email Take care, Team, S&T Engineers! ";