# General request sequence with authentication

```mermaid
sequenceDiagram
    participant Client as HTTP Client
    participant Router as Request Router
    participant Auth as JwtMiddleware
    participant Controller as Controller
    participant UseCase as Use Case

    Client->>Router: POST /api/items (with JWT)
    Router->>Auth: Forward request

    alt Authentication successful
        Auth->>Auth: Validate JWT
        Auth->>Controller: Forward authenticated request
        Controller->>Controller: Parse request body to DTO
        Controller->>UseCase: execute()
        UseCase-->>Controller: Result (success/error)
        Controller->>Controller: Convert result to HTTP response
        Controller-->>Client: HTTP Response (2xx)
    else Authentication fails
        Auth-->>Client: 401 Unauthorized
    end
```