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    ExceptionHandler

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    An exception handler: given the request context and the raised error, return Some(response) to handle it or None to defer to the next handler. The explicit MoonBit form of FastAPI's @app.exception_handler(ExcType) — the None case stands in for "this handler isn't registered for that type".

    HttpException

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    pub(all) suberror HttpException {
      HttpException(status~ : Int, detail~ : Json, headers~ : Array[(String, String)])
    }

    An HTTP error a handler can raise to short-circuit with a status and body (← FastAPI's HTTPException). detail is any JSON (a string is the common case); headers are added to the response (e.g. a WWW-Authenticate challenge). Caught by the app and mapped to a response.

    http_error

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    fn http_error(status : Int, detail : String, headers? : Array[(String, String)]) -> HttpException

    Build an HttpException with a string detail — the common case — and optional extra headers. raise http_error(404, "Item not found") reads like FastAPI's raise HTTPException(404, "Item not found").

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