Some default gRPC request examples do not have default fields set.

For example, CreateGreetingRequest is serialized into an empty JSON object when GrpcDocServicePlugin builds its default example request:

message CreateGreetingRequest {
    FullName full_name = 1;
}
message FullName {
    string first_name = 1;
    string last_name = 2;
}

A workaround is to specify an example object explicitly when building a DocService, as documented in https://line.github.io/armeria/server-docservice.html#example-requests-and-headers

/cc @gary-lo

[ikhoon]

Related work: https://github.com/fullstorydev/grpcui#request-form handles one-of nicely.

[ikhoon]

How about creating a new issue for revamping the debug page? I think the original issue has been resolved via #2828.

Yeap, let me close this issue and create anthoer one for the debug page.