public void AddInSteps()
        {
            var slize = CreateSlice(@"GET / HTTP/1.1
Connection: Keep-Alive
HOST: localhost
Content-Length: 0

");
            var stream = new SliceStream(slize, 1);
            _parser.Parse(stream);

            stream.SetLength(10);
            _parser.Parse(stream);
            Assert.False(_completed);

            stream.SetLength(16);
            _parser.Parse(stream);
            Assert.False(_completed);

            stream.SetLength(78);
            _parser.Parse(stream);
            Assert.True(_completed);
            Assert.Equal("Keep-Alive", _request.Headers["Connection"].Value);
            Assert.Equal("localhost", _request.Headers["HOST"].Value);
            Assert.Equal("0", _request.Headers["Content-Length"].Value);
        }