- obtain service metadata from subscriber
- support serialize type (other than protobuf) set in service metadata
- drop support for python 2.7
- support extra sofaheader in block Client class
- fix compatible issues with python 3.9
- migrate to modern coroutine syntax, drop support for python 3.4
- fix client socket failure
- fix infinite loop on losted connection
- fix heartbeat with mosn
- fix service publish with mosn integrate
- fix a infinite loop bug when parsing protocol
- fix server errors under python2.7
- support antsharecloud parameters.
- fix various errors under python2.7
- sofa trace rpc id may contains str.