Unfortunately, there is no mention of the list of implemented features.
I need support for automatic redirection (3xx code), does this version supports it ?
Just to be clear with your last sentence:
[…] The REST Client library supports the redirect 3XX […]
Do you mean that the http client does not support it, is it correct ?
(the reason behind is that I have a limited amount of memory flash reserved for MicroEJ on my device, so I’m trying to limit the number of embedded libraries)
As mentioned in the APIs (look for HttpURLConnection), you can see that the setFollowRedirects method allows you to configure whether you want the 3xx codes to be followed or not.
Moreover, the default behavior is indeed to follow such redirects.