clear query string PostRequestHandlerExecute

Question

I need to clear the queryString so I implemented an httpmodule

 public void Init(HttpApplication context)
            {
             context.PostRequestHandlerExecute += newEventHandler(OnEndRequest);

    }

and this is the method :

 public void OnEndRequest(Object sender, EventArgs e)
        {
            HttpApplication context = (HttpApplication)sender;


            if (HttpContext.Current.Request.QueryString != null && HttpContext.Current.Request.QueryString.Count != 0)
            { HttpContext.Current.Request.QueryString.Clear(); }
    }

but it's giving an exception :

System.NotSupportedException was unhandled by user code
  HResult=-2146233067
  Message=Collection is read-only.

the purpuse is to hide the parameters shown in the adress bar , in order to make it impossible to the user to change the values of the parameters , I can't use post method , because , it's the problem of a whole application , so i can't go back to all pages and changes all the code . to understand ; I want that the request MyPage.aspx?Param1=1 be processed and the response returned to the client but the addres bar must show MyPage.aspx instead of MyPage.aspx?Param1=1

Answer 1

The best and simple way to get this feature ( clear the request parameters ) is using a client side method :

this code will update the url shown in the adress bar without refreshing the page ( for browsers using html5 )

  var urlElts = document.documentURI.split('?');
                var newUrl = urlElts[0];
                window.history.replaceState("object or string", "Title", newUrl);