private sealed class BrotliCompressionService : CompressionService
        {
            private const string DeflateEncoding = "br";

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

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

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