protoc版本为v3.11.4,运行命令报waring错误: WARNING: Deprecated use of 'go_package' option without a full import path in "echo.proto", please specify:
option go_package = ".;echo";
A future release of protoc-gen-go will require the import path be specified.
See https://developers.google.com/protocol-buffers/docs/reference/go-generated#package for more information.
在echo.proto文件中这样改写option go_package = ".;echo"; 就不会报错了。