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POSTing to my ASP.NET MVC app from 3rd party site
<%
Response.Buffer = True
response.Clear()
response.contenttype="text/plain"
response.write "Status=OK" & vbCRLF
response.write "RedirectURL=http://www.redirectsomewhere.co.uk" & vbCRLF
response.End()
%>

[HttpPost]
public ActionResult TestCallback()
{
     return View();
}

@{
    Response.Buffer = true;
    Response.Clear();
    Response.ContentType = "text/plain";
    Response.Write("Status=OK" + System.Environment.NewLine);
    Response.Write("RedirectURL=http://www.redirectsomewhere.co.uk" + System.Environment.NewLine);
    Response.End();
}

http://myipaddress/CA_UAT/Token/TestCallback

http://myipaddress/CA_UAT/Token/TestCallback.asp

Response HTTP/1.1 200 OK
Source: Response
HttpHeader:Server
Request:User-Agent Cookie
Response:Response Date Set-Cookie

[HttpPost]
public string TestCallback()
{
  string result = "Status=OK";
  result += System.Environment.NewLine;
  result += "RedirectURL=http://www.redirectsomewhere.co.uk";
  result += System.Environment.NewLine;
  return result;
}

[HttpPost]
public ActionResult TestCallback()
{
  Response.Buffer = true;
  Response.Clear();
  Response.ContentType = "text/plain";
  Response.Write("Status=OK" + System.Environment.NewLine);
  Response.Write("RedirectURL=http://www.redirectsomewhere.co.uk" + System.Environment.NewLine);
  Response.Flush();
  return new EmptyResult();
}

[HttpPost]
public ActionResult TestCallback()
{
    var sb = new StringBuilder();
    sb.AppendLine("Status=OK");
    sb.AppendLine("RedirectURL=http://www.redirectsomewhere.co.uk");
    return Content(sb.ToString(), "text/plain");
}

public class ResponseViewModel
{
    public string Status { get; set; }
    public string RedirectUrl { get; set; }
}

public class StatusActionResult : ContentResult
{
    private readonly ResponseModel _model;
    public StatusActionResult(ResponseModel model)
    {
        _model = model;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        var response = context.HttpContext.Response;
        response.ContentType = "text/plain";
        response.Write(string.Format("Status={0}{1}", _model.Status, Environment.NewLine));
        response.Write(string.Format("RedirectURL={0}", _model.RedirectUrl));
    }
}

[HttpPost]
public ActionResult TestCallback()
{
    var model = new ResponseModel
    {
        Status = "OK",
        RedirectUrl = "http://www.redirectsomewhere.co.uk"
    };
    return new StatusActionResult(model);
}