---
name: actix-web-framework-18f110d977d7
description: High-performance Rust web framework with actor model foundation.
metadata:
  labels: [rust, actix-web, web, framework]
  triggers:
    files: ['**/main.rs', '**/handlers/*.rs']
    keywords: [actix_web, HttpServer, web, App]
---

# Actix-web Standards

## Handler Functions

```rust
use actix_web::{web, HttpResponse, Result};

// Path parameters
async fn get_user(path: web::Path<u64>) -> Result<HttpResponse> {
    let user_id = path.into_inner();
    Ok(HttpResponse::Ok().json(user))
}

// Query parameters
#[derive(Deserialize)]
struct Pagination {
    page: Option<u32>,
    limit: Option<u32>,
}

async fn list_users(query: web::Query<Pagination>) -> Result<HttpResponse> {
    let page = query.page.unwrap_or(1);
    Ok(HttpResponse::Ok().json(users))
}

// JSON body
async fn create_user(body: web::Json<CreateUser>) -> Result<HttpResponse> {
    let user = body.into_inner();
    Ok(HttpResponse::Created().json(created))
}
```

## Extractors

| Extractor | Purpose |
|-----------|---------|
| `web::Path<T>` | URL path parameters |
| `web::Query<T>` | Query string |
| `web::Json<T>` | JSON request body |
| `web::Form<T>` | Form data |
| `web::Data<T>` | Application state |
| `HttpRequest` | Full request access |

**Custom Extractors**:
```rust
impl FromRequest for AuthUser {
    type Error = Error;
    type Future = Ready<Result<Self, Self::Error>>;

    fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
        // Extract and validate auth header
    }
}
```

## State Management

```rust
struct AppState {
    db: PgPool,
    cache: RedisPool,
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    let state = web::Data::new(AppState {
        db: create_pool().await,
        cache: create_cache().await,
    });

    HttpServer::new(move || {
        App::new()
            .app_data(state.clone())
            .service(handlers)
    })
    .bind("127.0.0.1:8080")?
    .run()
    .await
}

// Access in handlers
async fn handler(state: web::Data<AppState>) -> Result<HttpResponse> {
    let conn = state.db.acquire().await?;
    Ok(HttpResponse::Ok().finish())
}
```

## Middleware

```rust
use actix_web::middleware::{Logger, Compress, NormalizePath};

App::new()
    .wrap(Logger::default())
    .wrap(Compress::default())
    .wrap(NormalizePath::trim())
    .wrap(custom_middleware)

// Custom middleware
async fn auth_middleware(
    req: ServiceRequest,
    srv: &Service,
) -> Result<ServiceResponse, Error> {
    // Validate token
    srv.call(req).await
}
```

## Error Handling

```rust
use actix_web::{error, HttpResponse};

#[derive(Debug, thiserror::Error)]
enum ApiError {
    #[error("Not found")]
    NotFound,
    #[error("Database error")]
    Database(#[from] sqlx::Error),
}

impl error::ResponseError for ApiError {
    fn error_response(&self) -> HttpResponse {
        match self {
            ApiError::NotFound => HttpResponse::NotFound().json({"error": "Not found"}),
            ApiError::Database(_) => HttpResponse::InternalServerError().finish(),
        }
    }
}
```

## Routing

```rust
App::new()
    .route("/", web::get().to(index))
    .service(
        web::scope("/api/v1")
            .route("/users", web::get().to(list_users))
            .route("/users/{id}", web::get().to(get_user))
            .route("/users", web::post().to(create_user))
    )
```

## Best Practices

1. **Concurrency**: Use `.workers(N)` to control thread pool size
2. **Timeouts**: Configure `keep_alive` and client timeouts
3. **Graceful Shutdown**: Handle SIGTERM properly
4. **Testing**: Use `actix_web::test` for integration tests


---
Source attribution: ngxtm
Original project: https://github.com/ngxtm/devkit/blob/9439f27ce3fa7fe53ff9278a1ee9a44bffa70eba/rules/rust/actix-web/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2024

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: ngxtm
Original project: https://github.com/ngxtm/devkit/blob/9439f27ce3fa7fe53ff9278a1ee9a44bffa70eba/rules/rust/actix-web/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering, Product Management
Roles: Backend Developer, Full-Stack Developer, Product Manager
Specialties: Backend
Tools: Rust
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 92e25f4d634b569f03b6ac8ebfd6bd05351fb170cda21e6047208c63bbe9e4f4