Compression / Caching and Request Object not working together ASP.NET

Question

I have a slight issue with an ASP.NET application,

I have configured a ViewBag variable to send to my View (using razor) the next page link with querystrings but when enabling this attribute :

public class CompressAttribute : System.Web.Mvc.ActionFilterAttribute
  {
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
      #region Cache
      HttpContext.Current.Response.Cache.SetExpires(DateTime.Now.AddDays(1));
      HttpContext.Current.Response.Cache.SetValidUntilExpires(true);
      HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.Public);
      HttpContext.Current.Response.Cache.VaryByHeaders["Accept-Encoding"] = true;
      #endregion
      #region Compression
      var encodingsAccepted = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
      if (string.IsNullOrEmpty(encodingsAccepted)) return;

      encodingsAccepted = encodingsAccepted.ToLowerInvariant();
      var response = filterContext.HttpContext.Response;

      if (encodingsAccepted.Contains("deflate"))
      {
        response.AppendHeader("Content-Encoding", "deflate");
        response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
      }
      else if (encodingsAccepted.Contains("gzip"))
      {
        response.AppendHeader("Content-Encoding", "gzip");
        response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
      }
      #endregion
    }
  }

The site doesn't take care of the following statement entirely :

ViewBag.NextPageLink = "/" + culture + "/next/" + pageName + Request.Url.Query;

it only produces the link : /culture/next/pageName but the querystring is not included (it's mark as null).

Is anything in my CompressAttribute that can cause that ? Because clearly when disabling it the redirection works.

EDIT :

It seems that the cache is in cause. Maybe the server doesn't re-render this link when reloading the page with different query.

Answer 1

The server returns the same cached page even when the query string has changed. To tell server to vary the cache per query string, use the HttpCacheVaryByParams .

Example:

HttpContext.Current.Response.Cache.VaryByParams["*"] = true; //* means all params

By the way, you may want to use the OutputCacheAttribute and IIS Compression instead of rolling your own.