How hide a download url from our web site

Question

I have the following code in my page:

if (Request.QueryString("link_id") == "12345" )
{
    Responce.Redirect("http://www.downloadsite.com/blablabla.png");
}

Now I want to hide that URL when somebody adds this link to his internet download manager :

http://www.mysite.com?link_id=12345

as you see the goal domain in different, I just want prevent my users to share my links.

Thanks in advance.

Answer 1

If I understand the question, you're trying to let the user download a file from http://www.downloadsite.com/blablabla.png that appears to the user, in every sense, to be coming from http://www.mysite.com?link_id=12345 . This is what I'd try:

if (Request.Params["link_id"] == "12345")
{
    Uri uri = new Uri("http://www.downloadsite.com/blablabla.png");
    using (var wc = new WebClient())
    using (var download = wc.OpenRead(uri))
    using (var respStream = Response.OutputStream)
        download.CopyTo(respStream);
}