1 pub mod pb { 2 tonic::include_proto!("grpc.examples.unaryecho"); 3 } 4 5 use pb::{echo_client::EchoClient, EchoRequest}; 6 use tonic::{metadata::MetadataValue, transport::Channel, Request}; 7 8 #[tokio::main] main() -> Result<(), Box<dyn std::error::Error>>9async fn main() -> Result<(), Box<dyn std::error::Error>> { 10 let channel = Channel::from_static("http://[::1]:50051").connect().await?; 11 12 let token: MetadataValue<_> = "Bearer some-auth-token".parse()?; 13 14 let mut client = EchoClient::with_interceptor(channel, move |mut req: Request<()>| { 15 req.metadata_mut().insert("authorization", token.clone()); 16 Ok(req) 17 }); 18 19 let request = tonic::Request::new(EchoRequest { 20 message: "hello".into(), 21 }); 22 23 let response = client.unary_echo(request).await?; 24 25 println!("RESPONSE={:?}", response); 26 27 Ok(()) 28 } 29