grpc-transcode, report error when I havae "google protobuf Timestamp" type

[zhigangcao]

version: docker 2.13.0-centos
I tried to use apisix to convert http -> grpc，but it not work while my pb has timestamp type param.

1 - prepare protobuf

my protobuf like below:
hello.proto:
`
import "google/protobuf/timestamp.proto";
service MyExampleService {
rpc Greeter(HelloRequest) returns (HelloReply);
}

enum EnumTag{
ENUM_TAG_FIRST = 0;
ENUM_TAG_SECOND = 1;
ENUM_TAG_THIRD = 2;
}

message HelloRequest {
EnumTag enum_tag = 1;
string cliend_id = 2;
google.protobuf.Timestamp timestamp = 3;
}
message HelloReply {
}
`

2 - upload pb

and I use cmd below to upload my pb file:
`

1. protoc --include_imports --descriptor_set_out=proto.pb proto/hello.proto
2. python ./upload_pb.py proto.pb myprotoid
   `

3 - config setting

and setting the grpc-transcode plugin using dashboard with the json config like this:
{ "deadline": 0, "disable": false, "method": "Greeter", "pb_option": [ "enum_as_value" ], "proto_id": "myprotoid", "service": "hello.MyExampleService" }

test

curl -i "127.0.0.1:9080/test-hello?enum_tag=0&cliend_id=test&timestamp=\{\"seconds\":123,\"nanos\":234\}"
or
curl -i "127.0.0.1:9080/test-hello?enum_tag=0&cliend_id=test&timestamp="

error

[error] 52#52: *696235 [lua] grpc-transcode.lua:126: phase_func(): transform request error: failed to encode request data to protobuf, client: 172.20.0.1, server: _, request: "GET /test-hello?enum_tag=0&cliend_id=test&timestamp= HTTP/1.1", host: "127.0.0.1:9080"
[warn] 52#52: *696235 [lua] plugin.lua:750: run_plugin(): grpc-transcode exits with http status code 400, client: 172.20.0.1, server: _, request: "GET /test-hello?enum_tag=0&cliend_id=test&timestamp= HTTP/1.1", host: "127.0.0.1:9080"
what happened and ,how can i fix this? thx a lot!!!!

[zhigangcao]

Also I used POST method, it will no error ,but my grpc server got nothing. usring spring-boot will report this warn:
i.g.n.s.i.grpc.netty.NettyServerHandler : Expected header TE: trailers, but null is received. This means some intermediate proxy may not support trailers