Compress HTTP GET Response

Question

I am currently working on migrating few of my MVC3 Controllers to MVC4 Api Controllers. I have implemented Compression mechanism for MVC3 controller Get Method Responses by

Answer 1

Use a class and write the following code

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class CompressFilter : ActionFilterAttribute
{
    public override void OnActionExecuted(HttpActionExecutedContext context)
    {
        var acceptedEncoding = context.Response.RequestMessage.Headers.AcceptEncoding.First().Value;
        if (!acceptedEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase)
        && !acceptedEncoding.Equals("deflate", StringComparison.InvariantCultureIgnoreCase))
        {
            return;
        }
        context.Response.Content = new CompressedContent(context.Response.Content, acceptedEncoding);
    }
}

Now create another class and write the following code.

public class CompressedContent : HttpContent
{
    private readonly string _encodingType;
    private readonly HttpContent _originalContent;
    public CompressedContent(HttpContent content, string encodingType = "gzip")
    {
        if (content == null)
        {
            throw new ArgumentNullException("content");
        }
        _originalContent = content;
        _encodingType = encodingType.ToLowerInvariant();
        foreach (var header in _originalContent.Headers)
        {
            Headers.TryAddWithoutValidation(header.Key, header.Value);
        }
        Headers.ContentEncoding.Add(encodingType);
    }
    protected override bool TryComputeLength(out long length)
    {
        length = -1;
        return false;
    }
    protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
    {
        Stream compressedStream = null;
        switch (_encodingType)
        {
            case "gzip":
                compressedStream = new GZipStream(stream, CompressionMode.Compress, true);
                break;
            case "deflate":
                compressedStream = new DeflateStream(stream, CompressionMode.Compress, true);
                break;
            default:
                compressedStream = stream;
                break;
        }
        return _originalContent.CopyToAsync(compressedStream).ContinueWith(tsk =>
        {
            if (compressedStream != null)
            {
                compressedStream.Dispose();
            }
        });
    }
}

Now use the following attribute in Controller or in any api action method like this

[Route("GetData")]
[CompressFilter]         
public HttpResponseMessage GetData()
{
}