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Gzip example in Global.asax

/ Published in: C#
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  1. <%@ Application Language="C#" %>
  2. <%@ Import Namespace="System.IO" %>
  3. <%@ Import Namespace="System.IO.Compression" %>
  4.  
  5. <script runat="server">
  6. void Application_PreRequestHandlerExecute(object sender, EventArgs e)
  7. {
  8.     HttpApplication app = sender as HttpApplication;
  9.     string acceptEncoding = app.Request.Headers["Accept-Encoding"];
  10.     Stream prevUncompressedStream = app.Response.Filter;
  11.  
  12.     if (!(app.Context.CurrentHandler is Page ||
  13.         app.Context.CurrentHandler.GetType().Name == "SyncSessionlessHandler") ||
  14.         app.Request["HTTP_X_MICROSOFTAJAX"] != null)
  15.         return;
  16.  
  17.     if (acceptEncoding == null || acceptEncoding.Length == 0)
  18.         return;
  19.  
  20.     acceptEncoding = acceptEncoding.ToLower();
  21.  
  22.     if (acceptEncoding.Contains("deflate") || acceptEncoding == "*")
  23.     {
  24.         // defalte
  25.         app.Response.Filter = new DeflateStream(prevUncompressedStream, CompressionMode.Compress);
  26.         app.Response.AppendHeader("Content-Encoding", "deflate");
  27.     }
  28.     else if (acceptEncoding.Contains("gzip"))
  29.     {
  30.         // gzip
  31.         app.Response.Filter = new GZipStream(prevUncompressedStream, CompressionMode.Compress);
  32.         app.Response.AppendHeader("Content-Encoding", "gzip");
  33.     }
  34. }
  35. </script>

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