httpservices/src/main/java/ucar/httpservices/HTTPUtil.java
static protected boolean
    hasDriveLetter(StringBuilder path)
    {
        return (path.length() >= 2
                && path.charAt(1) == ':'
                && DRIVELETTERS.indexOf(path.charAt(0)) >= 0);
    }
static protected boolean
    hasDriveLetter(StringBuilder path)
    {
        return (path.length() >= 2
                && path.charAt(1) == ':'
                && DRIVELETTERS.indexOf(path.charAt(0)) >= 0);
    }
Support function