Two issues on PHP contact page: "Notice: Undefined index: REQUEST_METHOD in line 3" ... Also, not able to redirect.

$name = $_POST["name"];
$email = $_POST["email"];
$message = $_POST["message"];
$email_body = "";
$email_body = $email_body . "Name: " . $name . "\n";
$email_body = $email_body . "Email: " . $email . "\n";
$email_body = $email_body . "Message: " . $message . "\n";

// TODO: Send Email

header("Location: contact.php?status=thanks");
exit;

<div class="wrapper">

    <h1>Contact</h1> 

    <?php if (isset($_GET["status"]) && $_GET["status"] == "thanks") { ?>
        <p>Thanks for the email! I&rsquo;ll be in touch shortly.</p>
    <?php  } else { ?>

        <p>I&rsquo;d love to hear from you! Complete the form to send me an email.</p>

        <form method="post" action="contact.php">

            <table>
                <tr>
                    <th>
                        <label for="name">Name</label>
                    </th>
                    <td>
                        <input id="name" type="text" name="name">
                    </td>
                </tr>
                <tr>
                    <th>
                        <label for="email">Email</label>
                    </th>
                    <td>
                        <input id="email" type="text" name="email">
                    </td>
                </tr>
                <tr>
                    <th>
                        <label for="message">Message</label>
                    </th>
                    <td>
                        <textarea id="message" type="text" name="message"></textarea>
                    </td>
                </tr>
            </table>

            <input type="submit" value="send"> 

        </form>

    <?php } ?>

</div>