You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: json.rs
    path of file: ./repos/crates.io/src/util/errors
    
    the code of the file until where you have to start completion: use axum::response::{IntoResponse, Response};
use axum::{Extension, Json};
use std::borrow::Cow;
use std::fmt;

use super::{AppError, BoxedAppError};

use crate::middleware::log_request::CauseField;
use cr
    
    fn response(&self) -> Response {
        const HTTP_DATE_FORMAT: &str = "%a, %d %b %Y %H:%M:%S GMT";
        let retry_after = self.retry_after.format(HTTP_DATE_FORMAT);

        let detail = format!(
            "{}. Please try again after {retry_after} or email \
             help@crates.io to have your limit increased.",
            self.action.error_message()
        );
        let mut response = json_error(&detail, StatusCode::TOO_MANY_REQUESTS);
        response.headers_mut().insert(
            header::RETRY_AFTER,
            retry_after
                .to_string()
                .try_into()
                .expect("HTTP_DATE_FORMAT contains invalid char"),
        );
        response
    }