How do I compress a Json result from ASP.NET MVC with IIS 7.5

Question

I\'m having difficulty making IIS 7 correctly compress a Json result from ASP.NET MVC. I\'ve enabled static and dynamic compression in IIS. I can verify with Fiddler that normal

Answer 1

The ActionFilterAttribute approach updated for ASP.NET 4.x and Includes Brotli.NET package.

using System;
using System.IO.Compression;
using Brotli;
using System.Web;
using System.Web.Mvc;


public class CompressFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext 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("BR"))
        {
            response.AppendHeader("Content-encoding", "br");
            response.Filter = new BrotliStream(response.Filter, CompressionMode.Compress);
        }
        else 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);
        }
    }
}