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URL Rewriting Using Httpmodules





  1. Visual studio installed on your machine.
  2. Have the hands on experience in creating web application.
  3. Have knowledge of HTTP modules.


  1. Create a web application and name it say URLRewriting.
  2. Add a class and inherit the class with IHttpModule interface.
  3. public class UrlRewriter : IHttpModule{}


  4. Now the class has implemented the IHttpModule interface then the class must implement 2 methods Init and Dispose.
  5. public void Dispose() {}
    public void Init(HttpApplication app) {}


  6. In this init method add an event handler and name it let us say Rewrite_BeginRequest. So the definition of Init function would be
  7. public void Init(HttpApplication app) {
      app.BeginRequest += new EventHandler(Rewrite_BeginRequest);
    }
    void Rewrite_BeginRequest(object sender, EventArgs e) {}


  8. When you create a web application a file default.aspx is created in it. Now add another file called Default2.aspx(you can name anything you want).
  9. Add a 2 buttons in Default.aspx.
  10. On button click event add the following code.
  11. protected void Button1_Click(object sender, EventArgs e) {
      Response.Redirect("Admin");
    }
    protected void Button2_Click(object sender, EventArgs e) {
      Response.Redirect("Contact");
    }


  12. Now go back to UrlRewriter class and add code to Rewrite_BeginRequest event. So the code would be
  13. void Rewrite_BeginRequest(object sender, EventArgs e) {
      HttpApplication appObject = (HttpApplication) sender;
      HttpContext contextObject = appObject.Context;
      string path = contextObject.Request.Url.AbsoluteUri;
      if (!path.EndsWith(".aspx")) {
        path = path.Split('/')[path.Split('/').Length - 1];
        contextObject.RewritePath("Default2.aspx?module=" + path);
      }
    }




  14. Now it is the time to register the HTTPmodule in web.config file. Add the following code in web.config file.
  15. <httpModules>
    	<add name="rewriter" type="CustomClass" />
    </httpModules>


  16. On default2.aspx write the following code
  17. protected void Page_Load(object sender, EventArgs e) {
      if (!IsPostBack) {
        string module = Request["module"].ToString();
        Response.Write(String.Format("You have entered {0} module", module));
      }
    }






Picture showing the output of URL rewriting using HTTPModules
Click to Enlarge




Posted By  -  Karan Gupta
 
Posted On  -  Sunday, November 21, 2010

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