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import { mimes } from "../core/utils.ts";import { extname } from "../deps/path.ts";
import type { Middleware } from "../core.ts";
/** Add the Content-Type header */export default function contentType(): Middleware {  return async (req, next) => {    const response = await next(req);    const { pathname } = new URL(req.url);    const ext = extname(pathname).toLowerCase();    const contentType = ext      ? mimes.get(ext) || "application/octet-stream"      : mimes.get(".html")!;    response.headers.set("content-type", contentType);    return response;  };}