Representational State Transfer (REST) for building scalable web-services is coming in Valentina Server 6, allowing your projects on non-client platforms such as Python and Android.
REST is widely used as alternative to SOAP, WSDL protocols and similar web approaches. Usually REST is based on HTTP/HTTPS, but it is not obligatory – it could be even based on some proprietary binary protocols.
No client libraries are required for this – the only thing you need is ability to work with are HTTP(S) to send/ receive HTTP packets, URL parsing, and JSON / XML for data in HTTP packets.
Valentina Server 6 adds support for SQLite, too; REST support works with both Valentina DB and SQLite.