我开发了一个基于tomcat-servlet的Web应用程序，我可以很好地在我的本地机器上运行。我发了一个json给它发送请求：
"curl ontent-type: application/json" --request POST --data '{"username":"Piran", "password":"123", "requestedUsername":"hsn.vahedi", "requestedPassword":"111", "role":"client", "firstName":"Hossein", "lastName":"Vahedi", "phoneNumber":"09212814194"}' localhost:8080/myApp/register"
它给了我正确的json响应。但是当我以这种方式在heroku上部署我的应用程序时：https://devcenter.heroku.com/articles/java-webapp-runner并向它发送请求，它给了我这样的响应：
<!DOCTYPE html>
<html>
<head>
<title>Heroku | Welcome to your new app!</title>
<style type='text/css'>
body {
background-color: white;
color: #333333;
font-family: Arial, sans-serif;
margin: 0;
padding: 36px;
line-height: 1;
font-size: 14px; }
.section {
margin-bottom: 36px; }
.section.friendly {
color: #222222; }
.section.friendly h1 {
font-size: 26px;
background-color: #dad8e4;
padding: 18px 22px 15px 22px;
margin: 0;
overflow: hidden; }
.section.friendly h1 strong {
display: inline-block;
float: left; }
.section.friendly h1 small {
display: inline-block;
float: right;
text-align: right;
font-size: 18px;
padding-top: 4px;
color: #333333; }
.section.friendly .article {
border: 4px solid #dad8e4;
padding: 24px 18px 18px 18px; }
.section.friendly .article h3 {
font-size: 20px;
margin: 0 0 18px 0; }
.section.friendly .article a {
color: #6b6ceb; }
.section.friendly .article a:visited {
color: #1d1d3b; }
.section.friendly .article p {
font-size: 14px; }
.section.friendly .article ul {
list-style-type: square; }
.section.original {
background-color: #eeeeee;
color: #444444; }
.section.original h2 {
background-color: #dddddd;
margin: 0;
padding: 18px 22px 18px 22px;
font-size: 20px; }
.section.original pre {
margin: 0;
padding: 18px 22px 18px 22px;
overflow: auto;
font-family: monaco, monospaced; }
.section.original pre code {
display: block;
font-size: 11px;
width: 100%; }
</style>
</head>
<body>
<div class='container'>
<div class='section friendly'>
<h1><strong>Heroku | Welcome to your new app!</strong></h1>
<div class='article'>
<p>Refer to the <a href="//devcenter.heroku.com/">documentation</a> if you need help deploying.</p>
</div>
</div>
</div>
</body>
</html>
有什么问题？谢谢！