Dubbo testing

Apache Dubbo is RPC framework developed by Alibaba.

### Dubbo sayHi
//@name sayHi
DUBBO 127.0.0.1:20880/GreetingsService/sayHi(java.lang.String)
Content-Type: application/json

"jackie"

Now httpx only supports end-to-end communication.

To test Dubbo Service in JetBrains IDEs, please install Dubbo Requests plugin from https://plugins.jetbrains.com/plugin/18570-dubbo-requests-in-http-client

Notes

Dubbo requires FQN(fully qualified name) for class, such as java.lang.Integer, java.lang.String. With httpx you can omit java.lang. prefix, and you can also use int, long, double, boolean ... primitive types.