core/src/main/java/org/nanohttpd/protocols/http/HTTPSession.java
private int findHeaderEnd(final byte[] buf, int rlen) {
        int splitbyte = 0;
        while (splitbyte + 1 < rlen) {

            // RFC2616
            if (buf[splitbyte] == '\r' && buf[splitbyte + 1] == '\n' && splitbyte + 3 < rlen && buf[splitbyte + 2] == '\r' && buf[splitbyte + 3] == '\n') {
                return splitbyte + 4;
            }

            // tolerance
            if (buf[splitbyte] == '\n' && buf[splitbyte + 1] == '\n') {
                return splitbyte + 2;
            }
            splitbyte++;
        }
        return 0;
    }
private int findHeaderEnd(final byte[] buf, int rlen) {
        int splitbyte = 0;
        while (splitbyte + 1 < rlen) {

            // RFC2616
            if (buf[splitbyte] == '\r' && buf[splitbyte + 1] == '\n' && splitbyte + 3 < rlen && buf[splitbyte + 2] == '\r' && buf[splitbyte + 3] == '\n') {
                return splitbyte + 4;
            }

            // tolerance
            if (buf[splitbyte] == '\n' && buf[splitbyte + 1] == '\n') {
                return splitbyte + 2;
            }
            splitbyte++;
        }
        return 0;
    }
Find byte index separating header from body. It must be the last byte of
the first two sequential new lines.