Donny Mack

Response Filter to Take out White Spaces and New Line Feeds using HttpResponse.Filter

I wanted to make a quick way to make every page of our new sites smaller. I was thinking we'll have to start formatting all of our HTML but that would make it nearly unreadable for us to develop with and then I remembered the Filter property of the HttpResponse object so I started investigating and found this article http://www.aspalliance.com/robertb/articles.aspx?articleId=6&print=true by Robert Boedigheimer and I was on my way.

Here is what I came up with to take out all tabs and new line feeds. After testing pages were definately smaller and rendering was quicker. If someone has a better way please let me know:

Implementation

Implementation is done application wide in my base page class' OnInit method which all webforms inherit from:

Response Filter Class File

using System.Text;
using System;
using System.Text.RegularExpressions;
using System.IO;

namespace CodeJunkies.Base {

 public class ResponseFilter : Stream {
 
  #region properties
 
  Stream responseStream;
  long position;
  StringBuilder html = new StringBuilder();
 
  #endregion
 
  #region constructor

  public ResponseFilter(Stream inputStream) {
 
   responseStream = inputStream;
 
  }
 
  #endregion

  #region implemented abstract members
 
  public override bool CanRead {
   get { return true; }
  }

  public override bool CanSeek {
   get { return true; }
  }

  public override bool CanWrite {
   get { return true; }
  }

  public override void Close() {
   responseStream.Close();
  }

  public override void Flush() {
   responseStream.Flush();
  }
 
  public override long Length {
   get { return 0; }
  }

  public override long Position {
   get { return position; }
   set { position = value; }
  }

  public override long Seek(long offset, System.IO.SeekOrigin direction) {
   return responseStream.Seek(offset, direction);
  }

  public override void SetLength(long length) {
   responseStream.SetLength(length);
  }

  public override int Read(byte[] buffer, int offset, int count) {
   return responseStream.Read(buffer, offset, count);
  }
 
  #endregion

  #region write method
 
  public override void Write(byte[] buffer, int offset, int count) {
 
   // string version of the buffer
   string sBuffer = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count);

   // end of the HTML file
   Regex oEndFile = new Regex("</html>", RegexOptions.IgnoreCase);
   if (oEndFile.IsMatch(sBuffer)) {
   
    // Append the last buffer of data
    html.Append(sBuffer);
   
    string tempResponse = html.ToString();
  
     string newBuffer = Regex.Replace(tempResponse, "\t", string.Empty );
     newBuffer = Regex.Replace(newBuffer, "\n", string.Empty );
     newBuffer = Regex.Replace(newBuffer, "\r", string.Empty );
     newBuffer = Regex.Replace(newBuffer, "<!--", "<!-- \n" );
     newBuffer = Regex.Replace(newBuffer, "// -->", "// --> \n" );
     
     tempResponse = newBuffer;
  
    byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(tempResponse);
   
    responseStream.Write(data, 0, data.Length);
  
   }
   else {
    html.Append(sBuffer);
   }
  
   }
  
   #endregion
  
  }
 }