actix-website/examples/errors/src/logging.rs

// <logging>
use actix_web::{error, Result};
use failure::Fail;
use log::debug;

#[derive(Fail, Debug)]
#[fail(display = "my error")]
pub struct MyError {
    name: &'static str,
}

// Use default implementation for `error_response()` method
impl error::ResponseError for MyError {}

pub fn index() -> Result<&'static str, MyError> {
    let err = MyError { name: "test error" };
    debug!("{}", err);
    Err(err)
}

pub fn main() {
    use actix_web::{middleware::Logger, web, App, HttpServer};

    std::env::set_var("RUST_LOG", "my_errors=debug,actix_web=info");
    std::env::set_var("RUST_BACKTRACE", "1");
    env_logger::init();

    HttpServer::new(|| {
        App::new()
            .wrap(Logger::default())
            .route("/", web::get().to(index))
    })
    .bind("127.0.0.1:8088")
    .unwrap()
    .run()
    .unwrap();
}
// </logging>