Poor c#/js proxy

gistfile1.cs

function jsonProxyDo(jsonDataModel, callback, errorback) {
    $.ajax({
        type: "POST",
        dataType: "json",
        url: settings.jsonProxyAddress,
        data: $.param({ 'd': JSON.stringify({
            'Data': JSON.stringify(jsonDataModel),
            'BaseAddress': settings.endpoint,
            'ServiceName': 'SomeService.svc/js/',
            'MethodName': 'SomeMethod' })
        }),
        success: function (msg) {
            callback(msg);
        },
        error: function (err) {
            errorback(err);
        }
    });
};

public class ProxyRequest
{
	public string BaseAddress { get; set; }
	public string ServiceName { get; set; }
	public string MethodName { get; set; }
	public string Type { get; set; }
	public string Data { get; set; }
}

public partial class JsonProxy : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string data = Request.Form["d"];
        if (!string.IsNullOrEmpty(data))
        {
            ProxyRequest r = JsonConvert.DeserializeObject<ProxyRequest>(data);

            HttpWebRequest request = null;

            if (r.Type.Equals("POST"))
            {
                request = (HttpWebRequest)WebRequest.Create(string.Format("{0}/{1}/{2}", r.BaseAddress, r.ServiceName, r.MethodName));
                request.Method = r.Type;
                Stream reqStream = request.GetRequestStream();
                byte[] reqBytes = Encoding.UTF8.GetBytes(r.Data);
                reqStream.Write(reqBytes, 0, reqBytes.Length);
                reqStream.Close();
            }
            if (r.Type.Equals("GET"))
            {
                request.Method = r.Type;
                request = (HttpWebRequest)WebRequest.Create(string.Format("{0}/{1}/{2}?{3}", r.BaseAddress, r.ServiceName, r.MethodName, r.Data));
            }

            request.ContentType = "application/json";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader contentReader = new StreamReader(response.GetResponseStream());
            Response.ContentType = response.ContentType;
            Response.Write(contentReader.ReadToEnd());
        }
        else
        {
            Response.Write("Must provide JSON to use this page.");
        }
    }
}