examples/other/protobuf/src/main.rs

#[macro_use]
extern crate prost_derive;

use actix_protobuf::{ProtoBuf, ProtoBufResponseBuilder as _};
use actix_web::{middleware, web, App, HttpResponse, HttpServer, Result};

#[derive(Clone, PartialEq, Message)]
pub struct MyObj {
    #[prost(int32, tag = "1")]
    pub number: i32,

    #[prost(string, tag = "2")]
    pub name: String,
}

async fn index(msg: ProtoBuf<MyObj>) -> Result<HttpResponse> {
    println!("model: {:?}", msg);
    HttpResponse::Ok().protobuf(msg.0) // <- send response
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    std::env::set_var("RUST_LOG", "actix_web=debug,actix_server=info");
    env_logger::init();

    HttpServer::new(|| {
        App::new()
            .wrap(middleware::Logger::default())
            .service(web::resource("/").route(web::post().to(index)))
    })
    .bind("127.0.0.1:8081")?
    .shutdown_timeout(1)
    .run()
    .await
}