Rust Programming Cookbook

How to do it...

You are just a few steps away from understanding error handling with actix-web:

1. In src/main.rs, we are going to add the basic imports:

#[macro_use]extern crate actix_web;use failure::Fail;use actix_web::{ http, middleware, web, App, HttpResponse, HttpServer, error};use serde_derive::{Deserialize, Serialize};use std::env;

2. As a next step, we are going to define our error types and augment them with attributes to make the types known to the framework:

#[derive(Fail, Debug)]enum WebError {    #[fail(display = "Invalid id '{}'", id)]    InvalidIdError { id: i32 },    #[fail(display = "Invalid request, please try again later")]    RandomInternalError,}impl error::ResponseError for WebError {    fn error_response(&self) -> HttpResponse { match ...