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import { HandlerContext } from "$fresh/server.ts";
export default function Page() {  return <div>This is HTML</div>;}
export const handler = {  GET(req: Request, { render }: HandlerContext) {    if (req.headers.get("accept")?.includes("text/html")) {      return render();    } else {      return new Response("This is plain text");    }  },  POST() {    return new Response("POST response");  },};