Question

I’m hosting images on a server, within an ASP.NET application.
I wrote a custom http handler that resizes the image and also increment “image_view_count” in a DB.

Now, I would like to also do some logging to know where the image is used. For example:

Image abc.jpg is on my server at http://www.myserver.com/stuff/abc.jpg
Somebody uses it by linking it in a forum post located at http://www.forum.com/thread.php?id=1234

I would like to retrieve the http://www.forum.com/thread.php?id=1234 URL in my http handler. When I use Request.Url.ToString(), in the previous example, I receive http://www.myserver.com/stuff/abc.jpg.

How should I do this ? Is there an equivalent in managed code to location.href ?

Answer 1

I believe you’re looking for the Referer header.

public void ProcessRequest(HttpContext context)
{
  IServiceProvider provider = (IServiceProvider)context;
  HttpWorkerRequest worker = (HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
  String referer = worker.GetKnownRequestHeader(HttpWorkerRequest.HeaderReferer);
}