public static HeaderGroup headers(final Header... headers) {
        final HeaderGroup headerGroup = new HeaderGroup();
        if (headers != null && headers.length > 0) {
            headerGroup.setHeaders(headers);
        }
        return headerGroup;
    }
Generates a response body with random content.
 @param nbytes length of the desired response body
 @return an {@link HttpEntity}
httpclient5-cache/src/test/java/org/apache/hc/client5/http/impl/cache/HttpTestUtils.java