ReadRequest

 private List<String> readRequest(PushbackInputStream pis)
                throws IOException {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            int state = 0;
            l: while (true) {
                int b = pis.read();
                if (b == -1)
                    return null;
                if (b != 13) {
                    bos.write(b);
                }
                switch (state) {
                    case 0:
                        if (b == 13) {
                            state = 1;
                        } else if (b == 10)
                            state = 4;
                        break;
                    case 1:
                        if (b == 10) {
                            state = 2;
                        } else
                            state = 0;
                        break;
                    case 2:
                        if (b == 13) {
                            state = 3;
                        } else
                            state = 0;
                        break;
                    case 3:
                        if (b == 10) {
                            break l;
                        } else
                            state = 0;
                        break;
                    case 4:
                        if (b == 10) {
                            break l;
                        } else
                            state = 0;
                        break;
                }
            }
            byte[] request = bos.toByteArray();
            String requestStr = new String(request, StandardCharsets.US_ASCII);
            String[] split = requestStr.split("\n");
            ArrayList<String> lines = new ArrayList<>();
            for (String line : split) {
                lines.add(line);
            }
            return lines;