Gzip compression with code in asp.net mvc.

Sharma Raushan

I have shared plesk hosting and have very less access priveleges to IIS configuration , so to enable Gzip compression i followed one of the post discussed here,

https://www.c-sharpcorner.com/Forums/gzip-compression-issue-on-iis-85

and implemented the below action filter

public class CompressAttribute:ActionFilterAttribute
{
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
HttpRequestBase request = filterContext.HttpContext.Request;
string acceptEncoding = request.Headers["Accept-Encoding"];
if (string.IsNullOrEmpty(acceptEncoding)) return;
acceptEncoding = acceptEncoding.ToUpperInvariant();
HttpResponseBase response = filterContext.HttpContext.Response;
if (acceptEncoding.Contains("GZIP"))
{
response.AppendHeader("Content-encoding", "gzip");
response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
}
else if (acceptEncoding.Contains("DEFLATE"))
{
response.AppendHeader("Content-encoding", "deflate");
response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
}
}
}

This is very good when we don't have access to IIS, but the problem is it works only for Html.

How to compress CSS and Javascript with this approach?or is there any other approach?

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sachin Singh6y ago
Accepted answer
This is the ultimate solution which compress html,css and javascript , if you can't configure IIS , use this
protected void Application_BeginRequest(object sender, EventArgs e)
    {
        // Implement HTTP compression
        HttpApplication app = (HttpApplication)sender;


        // Retrieve accepted encodings
        string encodings = app.Request.Headers.Get("Accept-Encoding");
        if (encodings != null)
        {
            // Check the browser accepts deflate or gzip (deflate takes preference)
            encodings = encodings.ToLower();
            if (encodings.Contains("gzip"))
            {
                app.Response.Filter = new GZipStream(app.Response.Filter, CompressionMode.Compress);
                app.Response.AppendHeader("Content-Encoding", "gzip");
            }
            else if
                (encodings.Contains("deflate"))
            {
                app.Response.Filter = new DeflateStream(app.Response.Filter, CompressionMode.Compress);
                app.Response.AppendHeader("Content-Encoding", "deflate");
            }
        }
    }
put this in your global.asax and everything is set.
Sachin Singh6y ago
Web.config solution should work but yes it does not work and i don't think there is any solution exists to compress css and js with code.
Varun Setia6y ago
I found this reference for web.config specific to GoDaddy http://web.archive.org/web/20121224102802/http://jeeshenlee.wordpress.com/2010/08/01/how-to-gzip-on-asp-net-and-godaddy
Varun Setia6y ago
@aashima does it help with gzip issue ? Just a concern.
Varun Setia6y ago
Thanks for extensively explaining the differences, you can refer to this. It explains more about your problem statement - https://stackoverflow.com/Questions/552317/how-to-implement-gzip-compression-in-asp-net. :)
Sharma Raushan6y ago
@ varunn setia,Bundling and minification is already there.
Gzip is not about bundling and minification , it reduces the bytes to be transferred over network.These are two different things.
Bundling only reduces the number of request and minification reduces the file size a little by removing the comments and whitespaces.
I think you got the point, what i am asking.
Varun Setia6y ago
You need to implement bundling and minification https://docs.microsoft.com/en-us/aspnet/mvc/overview/performance/bundling-and-minification