MethodDescriptorProto
class MethodDescriptorProto  {
}
 - clientStreaming
bool clientStreaming;
 Undocumented in source.
- inputType
string inputType;
 Undocumented in source.
- name
string name;
 Undocumented in source.
- options
MethodOptions options;
 Undocumented in source.
- outputType
string outputType;
 Undocumented in source.
- serverStreaming
bool serverStreaming;
 Undocumented in source.