JavaScript で CORS policy のエラーが出る

[ntukey]

(async () => {
    const url = "https://kenkoooo.com/atcoder/atcoder-api/v3/language_list";
    const option = { method: "GET", mode: "cors", cache: "force-cache" };
    const res = await fetch(url, option);
    const text = await res.text();
    console.log(text);
  })();

上記のようなスクリプトを atcoder.jp 上で実行すると、次のようなエラーが出て、
ファイルの取得ができないのですが、解決する方法があれば教えていただけませんか

Access to fetch at 'https://kenkoooo.com/atcoder/atcoder-api/v3/language_list'
from origin 'https://atcoder.jp' has been blocked by CORS policy:
No 'Access-Control-Allow-Origin' header is present on the requested resource.
If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

[hotate29]

バックエンド側でのCORSの設定を忘れていそう（.make_cors()が付いていてほしい）

AtCoderProblems/atcoder-problems-backend/src/server/language_count.rs

Lines 4 to 14 in 37e6478

	pub(crate) async fn get_language_list(
	_request: HttpRequest,
	pool: web::Data<PgPool>,
	) -> Result<HttpResponse> {
	let languages = pool
	.load_languages()
	.await
	.map_err(error::ErrorInternalServerError)?;
	let response = HttpResponse::Ok().json(&languages);
	Ok(response)
	}