/**
     * Gets the value of the specified header.
     *
     * @param name the name of the header.
     * @return the header value, or null if the header does not exist.
     */
    public String getHeaderValue(final String name) {
        final String[] values = getHeaderValues(name);
        if (values.length == 0) {
            return null;
        }
        return values[0];
    }