Capturing HTML generated from ASP.NET

Question

How do I best capture the HTML (in my instance, for logging) rendered by an aspx-page?

I dont want to have to write back to the page using Response.Write, since it m

Answer 1

Many load testers will allow you to log the HTTP responses generated, but bear in mind with ASP.NET those could be some very large log-files.

Edit: Response.Filter as per Tom Jelen's code is designed to give this kind of oversight and Response.Outputstream is otherwise unreadable.

Edit 2: For a page rather than a HTTPModule

public class ObserverStream : Stream
{
  private byte[] buffer = null;
  private Stream observed = null;

  public ObserverStream (Stream s)
  {
    this.observed = s;
  }

  /* important method to extend #1 : capturing the data */
  public override void Write(byte[] buffer, int offset, int count)
  {
    this.observed.Write(buffer, offset, count);
    this.buffer = buffer; //captured!
  }

  /* important method to extend #2 : doing something with the data */
  public override void Close()
  {
    //this.buffer available for logging here!
    this.observed.Close();
  }

  /* override all the other Stream methods/props with this.observed.method() */

  //...

}

and in your Page_Load (or before your response is written anyway)

Response.Filter = new ObserverStream(Response.Filter);