spring - How to get multipart contents using the PUT method in Spring MVC?

Question

I was fumbling to use RequestMethod.PUT (and RequestMethod.DELETE) as described in my previous question. At last the approach worked but when I designate a method with RequestMethod.PUT in my Spring controller, this method is called when the form is submitted but presumably it appears that the request is not regarded as a multipart request even though the form has that attribute enctype="multipart/form-data".

The form is as follows something similar to the previous question.

<form:form id="mainForm" name="mainForm" method="put" action="Temp.htm" enctype="multipart/form-data" commandName="tempBean">
    <input type="file" id="myFile" name="myFile"/>
    <input type="text" id="myText" name="myText"/>
    <input type="submit" id="btnSubmit" name="btnSubmit" value="Submit"/>
</form:form>

and the method in Spring which is invoked when a submit button is clicked is as follows.

@RequestMapping(method={RequestMethod.PUT}, value={"admin_side/Temp"}, headers={"content-type=multipart/form-data"})
public String update(@RequestParam("myText") String text, @ModelAttribute("tempBean") TempBean tempBean, BindingResult error, Map model, HttpServletRequest request, HttpServletResponse response)
{        
    System.out.println(ServletFileUpload.isMultipartContent(request)+"  :  "+text);
    return "admin_side/Temp";
}

Other request parameters are obtained like @RequestParam("myText") String text and even with request.getParameter("myText") but the the method invocation of ServletFileUpload.isMultipartContent(request) returns false (also request.getParameter("myFile") returns null) which means that the request doesn't appear to be a multipart request.

When the request method is changed to RequestMethod.POST, everything goes fine.

How to get multipart contents using the PUT method?