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    use actix_web::{http::StatusCode, HttpResponse, ResponseError};

    use derive_more::{Display, Error};

    /// Errors that can occur when processing CORS guarded requests.
    #[derive(Debug, Clone, Display, Error)]
    #[non_exhaustive]
    pub enum CorsError {
        /// Allowed origin argument must not be wildcard (`*`).
        #[display(fmt = "`allowed_origin` argument must not be wildcard (`*`)")]
        WildcardOrigin,

        /// Request header `Origin` is required but was not provided.
        #[display(fmt = "Request header `Origin` is required but was not provided")]
        MissingOrigin,

        /// Request header `Access-Control-Request-Method` is required but is missing.
        #[display(fmt = "Request header `Access-Control-Request-Method` is required but is missing")]
        MissingRequestMethod,

        /// Request header `Access-Control-Request-Method` has an invalid value.
        #[display(fmt = "Request header `Access-Control-Request-Method` has an invalid value")]
        BadRequestMethod,

        /// Request header `Access-Control-Request-Headers` has an invalid value.
        #[display(fmt = "Request header `Access-Control-Request-Headers` has an invalid value")]
        BadRequestHeaders,

        /// Origin is not allowed to make this request.
        #[display(fmt = "Origin is not allowed to make this request")]
        OriginNotAllowed,

        /// Request method is not allowed.
        #[display(fmt = "Requested method is not allowed")]
        MethodNotAllowed,

        /// One or more request headers are not allowed.
        #[display(fmt = "One or more request headers are not allowed")]
        HeadersNotAllowed,
    }

    impl ResponseError for CorsError {
        fn status_code(&self) -> StatusCode {
            StatusCode::BAD_REQUEST
        }

        fn error_response(&self) -> HttpResponse {
            HttpResponse::with_body(self.status_code(), self.to_string()).map_into_boxed_body()
        }
    }