public static ClassicHttpRequest makeDefaultRequest() {
        return new BasicClassicHttpRequest(Method.GET.toString(), "/");
    }
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