Web Caching proxy server

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I want to develop an application in the proxy server, which is capable of caching the web pages, which i would use later to cache pages which i would have browsed more times.

So i want a code in C# for that. if anybody could help me for that.

OR what are the preferred steps (algorithms) to do that?

Best regards...

Posted 7-Nov-11 9:53am

Mostafa8

Updated 7-Nov-11 9:54am

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Mostafa8 30-Nov-11 4:25am

I've an exception here:-
Unhandled Exception: System.Net.HttpListenerException: Access is denied
at System.Net.HttpListener.Start()

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John Stewien · Accepted Answer · 2011-11-17T19:41:00

Here's a starting point, this link has some proxy server code.

http://code.cheesydesign.com/?p=393[^]

Then what you need is an algorithm to change the URL to a filename, which you can store in your cache. So some code like this:

C#

protected static string UrlToFilename(string url) {
  // With jpegs and height fields the bits after the ? seem to vary from machine to machine

  string filename = url;

  // Truncate the filename and add a hash if it is too long
  if (filename.Length > 160) {
    MD5 hash = MD5.Create();
    byte[] hexResult = hash.ComputeHash(Encoding.Unicode.GetBytes(url));
    filename = filename.Substring(0, 160) + BitConverter.ToString(hexResult).Replace("-", "");
  }

  int index;
  while ((index = filename.IndexOfAny(System.IO.Path.GetInvalidFileNameChars())) != -1) {
    filename = filename.Replace(filename[index], '_');
  }
  return filename;
}

Then from here you can store the files in a directory structure of your choosing, and in the proxy server, check if the file exists, if so use the file, else fetch from the internet.