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Related Code

using System.Collections.Generic;
using System;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Web.Mvc;

namespace MvcHelpers
{
    /// <summary>
    /// http://www.ietf.org/rfc/rfc2616.txt See section 3.5
    /// </summary>
    public class CompressAttribute : ActionFilterAttribute
    {
        Dictionary<string, Func<Stream, Stream>> encodings = new Dictionary<string, Func<Stream, Stream>>(StringComparer.InvariantCultureIgnoreCase)
        {
            {"gzip", stream => new GZipStream(stream, CompressionMode.Compress)},
            {"x-gzip", stream => new GZipStream(stream, CompressionMode.Compress)},
            {"deflate", stream => new DeflateStream(stream, CompressionMode.Compress)},
            {"x-deflate", stream => new DeflateStream(stream, CompressionMode.Compress)},
        };

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var acceptEncodingRaw = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
            if (string.IsNullOrEmpty(acceptEncodingRaw)) return;

            var match = (from encoding in acceptEncodingRaw.Split(',')
                         let encoder = SafeGet(encoding)
                         where encoder != null
                         select new {encoding, encoder}).FirstOrDefault();

            if (match == null) return;

            var response = filterContext.HttpContext.Response;
            response.AppendHeader("Content-encoding", match.encoding);
            response.Filter = match.encoder(response.Filter);
        }

        private Func<Stream, Stream> SafeGet(string encoding)
        {
            Func<Stream, Stream> encoder;
            encodings.TryGetValue(encoding, out encoder);
            return encoder;
        }
    }
}

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