Spring MVC重定向与POST

I am trying to redirect a user to external url to complete the transaction and this website is based SAML based authentication and accepts SAMLResponse as a post parameter. Below is my controller able to get the values in the logs

-----控制器----------------------------------------------------

@RequestMapping(value="/redirect", method = { RequestMethod.GET, RequestMethod.POST })

public String redirect(HttpServletRequest request, HttpServletResponse response, RedirectAttributes redirectAttrs) {

String samlRes =  String.valueOf(request.getSession().getAttribute("STRRESPONSE"));

byte[] base64samlRes = Base64.encode(samlRes.getBytes());


redirectAttrs.addAttribute("SAMLResponse", base64samlRes);
L.debug("Redirecting " +  samlRes);
L.debug("Redirecting  Base64 Encoder  " +    new String(base64samlRes, Charset.forName("UTF-8")));
return "redirect";

----------------控制器结束------------------

and using the below html to post the external website.. I am seeing the browser the html title but it is not loading the external portal and values in the html is also null

----HTML自动提交------------------

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Redirect Payment Portal</title>
</head>
<body>
<ul>
<li>SamlResponse: "${SAMLResponse}"</li>
</ul>
<form name="myRedirectForm" action="<external url>" method="post">
<input name="SAMLResponse" type="hidden" value="${SAMLResponse}" />
<noscript>
<input type="submit" value="Click here to continue" />
</noscript>
</form>
<script type="text/javascript">

$(document).ready(function() {
document.myRedirectForm.submit();
});

</script>
</body>
</html>

=====================结束HTML------------------
我是否缺少任何

我可以通过修改值[[${SAMLResponse}]]来检索html中的值，但表单没有提交

通过以下更新最终解决了问题

------HTML---修改了下列

<input name="SAMLResponse" type="hidden" value="${SAMLResponse}" />
to
<input name="SAMLResponse" type="hidden" th:value="${SAMLResponse}" />

---结束HTML----

-----控制器更改----

@RequestMapping(value="/redirect", method = { RequestMethod.GET, RequestMethod.POST })

public ModelAndView redirect(HttpServletRequest request, HttpServletResponse response, Model model) {

String samlRes =  String.valueOf(request.getSession().getAttribute("STRRESPONSE"));

byte[] base64samlRes = Base64.encode(samlRes.getBytes());


model.addAttribute("SAMLResponse", new String(base64samlRes, Charset.forName("UTF-8"));
L.debug("Redirecting " +  samlRes);
L.debug("Redirecting  Base64 Encoder  " +    new String(base64samlRes, Charset.forName("UTF-8")));
return new ModelAndView ("redirect");

----控制器更改结束------

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