Warum funktioniert mein Kontaktformular in Brave, aber nicht in anderen Browsern?-Fragen und Antworten zum chinesischen PHP-Netzwerk

Mein Formular funktioniert in Brave auf meinem Computer, aber nicht in Safari oder Google auf meinem Computer. Es funktioniert auch nicht auf mobilen Geräten. Wenn es nicht funktioniert, wird ein POST 409-Fehler zurückgegeben.

Das ist mein HTML-Code.

<div class="row">
                            <div class="col-md-12 col-sm-12" id="result"></div>
                            <div class="col-md-3 col-sm-6">
                                <div class="form-group">
                                    <label for="userName" class="d-none"></label>
                                    <input class="form-control" type="text" placeholder="First Name:" required id="userName" name="userName">
                                </div>
                            </div>
                            <div class="col-md-3 col-sm-6">
                                <div class="form-group">
                                    <label for="companyName" class="d-none"></label>
                                    <input class="form-control" type="tel" placeholder="Company Name"  id="companyName" name="companyName">
                                </div>
                            </div>
                            <div class="col-md-3 col-sm-6">
                                <div class="form-group">
                                    <label for="email" class="d-none"></label>
                                    <input class="form-control" type="email" placeholder="Email:" required id="email" name="email">
                                </div>
                            </div>
                            <div class="col-md-3 col-sm-6">
                                <button type="submit" class="button gradient-btn w-100" id="submit_btn">subscribe</button>
                            </div>
                        </div>
                    </form>

Das ist mein PHP-Code

<?php

use PHPMailer\PHPMailer\PHPMailer;

if($_POST)
{

    require_once "PHPMailer/Exception.php";
    require_once "PHPMailer/PHPMailer.php";
    require_once "PHPMailer/SMTP.php";

    $mail = new PHPMailer();


    $your_email = "[email protected]";  //Replace with recipient email address

    $to_Email       = $your_email;

    //check if its an ajax request, exit if not
    if(!isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {

        //exit script outputting json data
        $output = json_encode(
        array(
            'type'=>'error',
            'text' => 'Request must come from Ajax'
        ));

        die($output);
    }

    //check $_POST vars are set, exit if any missing
    if(!isset($_POST["userName"]) || !isset($_POST["userEmail"]) || !isset($_POST["userMessage"]))
    {
        $output = json_encode(array('type'=>'error', 'text' => 'Input fields are empty!'));
        die($output);
    }

    //Sanitize input data using PHP filter_var().
    $user_Name        = filter_var($_POST["userName"], FILTER_SANITIZE_STRING);
    $user_Email       = filter_var($_POST["userEmail"], FILTER_SANITIZE_EMAIL);
    $user_Phone =  $_POST["userPhone"];
    //$user_Subject =  $_POST["userSubject"];
    $user_Message     = filter_var($_POST["userMessage"], FILTER_SANITIZE_STRING);

    //additional php validation
    if(strlen($user_Name)<3) // If length is less than 3 it will throw an HTTP error.
    {
        $output = json_encode(array('type'=>'error', 'text' => 'Name is too short or empty!'));
        die($output);
    }
    if(!filter_var($user_Email, FILTER_VALIDATE_EMAIL)) //email validation
    {
        $output = json_encode(array('type'=>'error', 'text' => 'Please enter a valid email!'));
        die($output);
    }

    if(strlen($user_Message)<5) //check emtpy message
    {
        $output = json_encode(array('type'=>'error', 'text' => 'Too short message! Please enter something.'));
        die($output);
    }


       //Server settings
//    $mail->isSMTP();                                            // Send using SMTP
//    $mail->Host       = 'smtp.googlemail.com';                    // Set the SMTP server to send through
//    $mail->SMTPAuth   = true;                                   // Enable SMTP authentication
//    $mail->Username   = '[email protected]';                     // SMTP username
//    $mail->Password   = 'your password';                         // SMTP password
//    $mail->SMTPSecure = 'TLS';         // Enable TLS encryption; `PHPMailer::ENCRYPTION_SMTPS` also accepted
//    $mail->Port       = 587;                                    // TCP port to connect to

    //Recipients
     $mail->setFrom($user_Email,$user_Name);
     $mail->addAddress($your_email, 'Theme Industry');     // Add a recipient
     $mail->addReplyTo($your_email, 'Information');


    // Content
    $mail->isHTML(true);                                  // Set email format to HTML
    $mail->Subject = 'New Contact Inquiry from your Website';
    $mail->Body  = "<h4 style='text-align: center;padding: 25px 15px;background-color: #0c6c9e;color: #FFFFFF;font-size:16px;width:90%;border-radius: 10px;'>Hi There! You have a new inquiry from your website.</h4><br><br>";


    $mail->Body .= "<strong>Name: </strong>". $user_Name ."<br>";
    $mail->Body .= "<strong>Email: </strong>". $user_Email ."<br>";
    $mail->Body .= "<strong>Phone: </strong>". $user_Phone ."<br>";
    $mail->Body .= "<strong>Message: </strong>". $user_Message ."<br>";

    $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

    if(!$mail->send())
    {
        $output = json_encode(array('type'=>'error', 'text' => 'Could not send mail! Please check your PHP mail configuration.'));
        die($output);
    }else{
        $output = json_encode(array('type'=>'message', 'text' => 'Hi '.$user_Name .' Thank you for contacting us.'));
        die($output);
    }

}
?>

Das ist mein JavaScript-Code

//contact us

    $("#submit_btn1 , #submit_btn").on('click', function () {

        let userName = $('#name1').val();

        let userEmail = $('#email1').val();

        let userMessage = $('#message1').val();

        let result;

        if(this.id === 'submit_btn'){

            result = $('#result');

            userMessage = $('#companyName').val();

            userName = $('#userName').val();

            userEmail = $('#email').val();

        }

        else{

            result = $('#result1');

        }

        //simple validation at client's end

        let postData, output;

        let proceed = true;

        if (userName === "") {

            proceed = false;

        }

        if (userEmail === "") {

            proceed = false;

        }

        if (userMessage === "") {

            proceed = false;

        }

        //everything looks good! proceed...

        if (proceed) {



            //data to be sent to server

            postData = {

                'userName': userName,

                'userEmail': userEmail,

                'userMessage': userMessage

            };



            //Ajax post data to server

            $.post('https://thordigi.com/contact.php', postData, function (response) {

                //load json data from server and output message

                if (response.type === 'error') {

                    output = '<div class="alert-danger" style="padding:10px; margin-bottom:25px;">' + response.text + '</div>';

                } else {

                    output = '<div class="alert-success" style="padding:10px; margin-bottom:25px;">' + response.text + '</div>';

                    //reset values in all input fields

                    $('.getin_form input').val('');

                    $('.getin_form textarea').val('');



                }



                result.slideUp("fast").html(output).slideDown();

            }, 'json');



        } else {

            output = '<div class="alert-danger" style="padding:10px; margin-bottom:25px;">Please provide the missing fields.</div>';

            result.slideUp("fast").html(output).slideDown();

        }



    });

Ich stecke schon seit einiger Zeit in diesem Problem fest und würde mich daher über jede Hilfe sehr freuen!