private sealed class DeflateCompressionService : CompressionService
        {
            private const string DeflateEncoding = "deflate";

            public override string EncodingType
            {
                get { return DeflateEncoding; }
            }

            protected override Stream CreateCompressionStream(Stream output)
            {
                return new System.IO.Compression.DeflateStream(output, CompressionMode.Compress, true);
            }

            protected override Stream CreateDecompressionStream(Stream input)
            {
                return new System.IO.Compression.DeflateStream(input, CompressionMode.Decompress, true);
            }
        }

        private sealed class GZipCompressionService : CompressionService
        {
            internal const string GZipEncoding = "gzip";

            public override string EncodingType
            {
                get { return GZipEncoding; }
            }

            protected override Stream CreateCompressionStream(Stream output)
            {
                return new System.IO.Compression.GZipStream(output, CompressionMode.Compress, true);
            }

            protected override Stream CreateDecompressionStream(Stream input)
            {
                return new System.IO.Compression.GZipStream(input, CompressionMode.Decompress, true);
            }
        }