Wicket http post, get raw data from servletrequest

I try do POST some data to a Wicket WebPage. This works fine if the data is in a form. However, I want to post the data with jQuery's ajax-post. I am unable to get this data in my Page-constructor.

This is my jquery command:

$.ajax({
                    type: "post",
                    cache: false,
                    url: "http://localhost:8888/testjson",
                    data: JSON.stringify({"aap":"noot"),

                    contentType: 'application/json',
                    success: function(ydata){alert("aap");},
                    failure: function(errMsg) {alert(errMsg);},
                        contentType: false,
                    dataType: "json"
                });

The /testjson is a mounted WebPage.

public TestJsonApiPage( PageParameters pp )
{
    try
    {
        byte[] data = IOUtils.toByteArray( ( (ServletWebRequest) TestJsonApiPage.this.getRequest() ).getContainerRequest().getInputStream() );
    }
    catch ( IOException e )
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

This is the constructor. What I see happening is that the inputstream is empty. However, when debugging, I see the raw data that I posted in HttpServletRequest in the newWebRequest in my WicketApplication

tl;dr How to get the raw post data in Wicket Page?

It seems Page does something to the post-parameters.

The solution for my problem is to use a Resource.

    public class MyResource extends AbstractResource
    @Override
    protected ResourceResponse newResourceResponse( Attributes attributes )
    {

        ResourceResponse resourceResponse = new ResourceResponse();
        resourceResponse.setContentType( "text/json" );
        resourceResponse.setTextEncoding( "utf-8" );

        HttpServletRequest request = (HttpServletRequest) attributes.getRequest().getContainerRequest();

        try
        {
            this.json = IOUtils.toString( request.getInputStream() );
        }
        catch ( IOException e )
        {
            e.printStackTrace();
        }

        resourceResponse.setWriteCallback( new WriteCallback()
        {
            @Override
            public void writeData( Attributes attributes ) throws IOException
            {
                OutputStream outputStream = attributes.getResponse().getOutputStream();
                Writer writer = new OutputStreamWriter( outputStream );


                writer.write( MyResource.this.json );
                writer.close();
            }
        } );

        return resourceResponse;
    }