AMP Form submission redirect or response

You can redirect user after successful submission, however it can only be done if you are submitting values to a secure URL (like https://www.example.com).

HTML With AMP-Form

<!doctype html>
<html amp lang="en">
  <head>
    <meta charset="utf-8">
    <script async src="https://cdn.ampproject.org/v0.js"></script>
    <title>Hello, AMPs</title>
    <link rel="canonical" href="http://example.ampproject.org/article-metadata.html" />
    <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
    <script type="application/ld+json">
      {
        "@context": "http://schema.org",
        "@type": "NewsArticle",
        "headline": "Open-source framework for publishing content",
        "datePublished": "2015-10-07T12:02:41Z",
        "image": [
          "logo.jpg"
        ]
      }
    </script>
    <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
    <script async custom-element="amp-form" src="https://cdn.ampproject.org/v0/amp-form-0.1.js"></script>
  </head>
  <body>
    <h1>Hello World!</h1>
      <form target="_top" action-xhr="https://test.php" method="post" name="test">
        <input type="text" name="name" value="ABRA KA DABRA!">
        <input type="submit"/>
    </form>
  </body>
</html>

SUBMISSION REQUEST HANDLER CODE IN PHP

<?php
if(!empty($_POST))
{
    $name = $_POST['name'];

    /*/ this is the email we get from visitors*/
    $domain_url = (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]";
    $redirect_url="https://example.com/thank-you";

    /*//-->MUST BE 'https://';*/
    header("Content-type: application/json");
    header("Access-Control-Allow-Credentials: true");
    header("Access-Control-Allow-Origin: *.ampproject.org");
    header("AMP-Access-Control-Allow-Source-Origin: ".$domain_url);


    /*/ For Sending Error Use this code /*/
    if(!mail("[email protected]" , "Test submission" , "email: $name <br/> name: $name" , "From: $namen ")){
        header("HTTP/1.0 412 Precondition Failed", true, 412);

        echo json_encode(array('errmsg'=>'There is some error while sending email!'));
        die();
    }
    else
    {
        /*/--Assuming all validations are good here--*/
        if( empty($redirect_url))
        {
            header("Access-Control-Expose-Headers: AMP-Access-Control-Allow-Source-Origin");
        }
        else
        {
            header("AMP-Redirect-To: ".$redirect_url);
            header("Access-Control-Expose-Headers: AMP-Redirect-To, AMP-Access-Control-Allow-Source-Origin");        }
            echo json_encode(array('successmsg'=>$_POST['name'].'My success message. [It will be displayed shortly(!) if with redirect]'));
        die();
    }
}?>

This post helped me create an AMP redirect response for C# thank you:

public virtual ActionResult AmpRedirect(string redirectUrl, string __amp_source_origin)
{
    if (redirectUrl != string.Empty)
    {   
        HttpContext.Response.AddHeader("AMP-Redirect-To", redirectUrl);
        HttpContext.Response.AddHeader("AMP-Access-Control-Allow-Source-Origin", __amp_source_origin);
        HttpContext.Response.AddHeader("Access-Control-Expose-Headers", "AMP-Redirect-To, AMP-Access-Control-Allow-Source-Origin");
    }

    HttpContext.Response.AddHeader("Content-type", "text/json");
    return Json(new {Content = ""});
}

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