pub fn new(message: T) -> Self {
        Response {
            metadata: MetadataMap::new(),
            message,
            extensions: Extensions::new(),
        }
    }
Create a new gRPC response.

```rust
# use tonic::Response;
# pub struct HelloReply {
#   pub message: String,
# }
# let name = "";
Response::new(HelloReply {
message: format!("Hello, {}!", name).into(),
});
```
tonic/src/response.rs