Thanks Jan, I read doc about options and the file descriptor.proto
<https://github.com/google/protobuf/blob/master/src/google/protobuf/descriptor.proto>.
It seems quite an advance usage and I choose to ignore them ^_^.
在 2017年2月21日星期二 UTC+8下午5:11:18，Jan Tattermusch写道：
>
> Hi,
>
> You can add service options inside { }. See
> https://developers.google.com/protocol-buffers/docs/proto3#options (if
> you don't know what message, service etc. options are, chances are you can
> safely ignore they exist).
>
> Jan
>
> On Mon, Feb 20, 2017 at 10:33 PM, 王迁 <[email protected] <javascript:>>
> wrote:
>
>> There are two kind of service definition in grpc official guide,
>>
>> one is:
>>
>> service HelloService {
>> rpc SayHello (HelloRequest) returns (HelloResponse); // end with ;}
>>
>>
>> and the other is:
>>
>> service HelloService {
>> rpc SayHello (HelloRequest) returns (HelloResponse) {} // end with {}}
>>
>>
>>
>> Is there some difference between them?
>>
>> Thanks!
>>
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