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import type { Request, Response } from "../mod.ts";
export interface DnsPrefetchControlOptions {  allow?: boolean;}
function getHeaderValueFromOptions(  options?: DnsPrefetchControlOptions,): "on" | "off" {  if (options && options.allow) {    return "on";  } else {    return "off";  }}
export const dnsPrefetchControl = (options?: DnsPrefetchControlOptions) => {  const headerValue = getHeaderValueFromOptions(options);
  return (req: Request, res: Response) => {    res.setHeader("X-DNS-Prefetch-Control", headerValue);  };};