public static byte[] toByteArray(InputStream input) throws IOException {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        byte[] buf = new byte[1024];
        for (int n = input.read(buf); n != -1; n = input.read(buf)) {
            os.write(buf, 0, n);
        }
        return os.toByteArray();
    }
Get the contents of an <code>InputStream</code> as a ByteArray
<p>
This method buffers the input internally, so there is no need to use a
<code>BufferedInputStream</code>.

@param input
           the <code>InputStream</code> to read from
@return the byte array
@throws NullPointerException
            if the input is null
@throws IOException
            if an I/O error occurs
src/main/java/spark/utils/IOUtils.java