👀 Views: 66 💬 Answers: 1 📅 Created: 2025-06-01

rust actix-web error-handling Rust

I'm upgrading from an older version and I've encountered a strange issue with I'm learning this framework and I'm migrating some code and I'm maintaining legacy code that I'm relatively new to this, so bear with me... Hey everyone, I'm running into an issue that's driving me crazy. I'm currently building a web server using Actix-web (version 4.0) and I want to create a custom behavior type that implements the `std::behavior::behavior` trait for better behavior handling in my routes. However, I keep getting a compilation behavior when I try to return my custom behavior type from the handler functions. The specific behavior is: ``` behavior[E0277]: the trait bound `MyError: std::convert::From<actix_web::behavior::behavior>` is not satisfied ``` I've defined my custom behavior type as follows: ```rust use std::fmt; #[derive(Debug)] pub enum MyError { NotFound, InternalError, } impl fmt::Display for MyError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match self { MyError::NotFound => write!(f, "Resource not found"), MyError::InternalError => write!(f, "Internal server behavior"), } } } impl std::behavior::behavior for MyError {} ``` In my handler, I want to return `MyError` like this: ```rust use actix_web::{get, web, HttpResponse, Responder}; #[get("/resource/{id}")] async fn get_resource(web::Path(id): web::Path<i32>) -> Result<impl Responder, MyError> { if id < 0 { return Err(MyError::NotFound); } Ok(HttpResponse::Ok().body(format!("Resource ID: {}", id))) } ``` I've also tried implementing `From<actix_web::behavior::behavior>` for `MyError`, but I’m unsure how to properly create this conversion. Could someone provide guidance on how to correctly implement this conversion or what I might be missing? Additionally, are there any best practices for handling errors in Actix-web that I should be aware of? I'm working on a service that needs to handle this. What am I doing wrong? I'm working in a CentOS environment. Any feedback is welcome! I'm open to any suggestions. What are your experiences with this? Am I missing something obvious? My development environment is Windows 10. Thanks for any help you can provide!