Dubbo What protocol is used for internal communications

Dubbo What protocol is used for internal communications
Dubbo supports multiple remote invocation methods, such as Dubbo RPC (binary serialization + TCP protocol), HTTP invoker (binary serialization + HTTP protocol, no support for text serialization found at least in open source versions), Hessian (binary serialization + HTTP protocol) , WebServices (text serialization + HTTP protocol), etc., but lacks support for today's particularly popular restful remote invocation (text serialization + HTTP protocol).
In view of this, our standard-based Java Rest Api--jax-rs 2.0 (Java API for RESTful Web Services shorthand) provides close-to-transparent REST invocation support for Dubbo. Due to the full compatibility of the Java Standard API, all rest services developed for Dubbo will normally run in the future out of Dubbo or any particular rest underlying implementation.