{
  "codec": "json（同时兼容 proto，Bash 下可直接用 grpcurl）",
  "example": "grpcurl -plaintext -d '{\"msg\":\"hi\"}' HOST:PORT cdn.probe.v1.Probe/Echo",
  "example2": "grpcurl -plaintext HOST:PORT grpc.health.v1.Health/Check",
  "grpc_available": true,
  "h2c": true,
  "note": "同一端口支持 h2c 明文 HTTP/2 与 gRPC；-grpc-addr 可另开纯 gRPC 端口",
  "services": [
    "cdn.probe.v1.Probe/Echo",
    "cdn.probe.v1.Probe/Ping",
    "grpc.health.v1.Health/Check",
    "grpc.health.v1.Health/Watch"
  ]
}