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x/snelm/deps/dns-prefetch-control/index.ts

Snelm: improved security middleware for deno web frameworks, derived from helmet for Node.
denjucks/snelm
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import { RequestResponseInterface } from "../../frameworks/interface.ts";
interface DnsPrefetchControlOptions {  allow?: boolean;}
function getHeaderValueFromOptions(options?: DnsPrefetchControlOptions): 'on' | 'off' {  if (options && options.allow) {    return 'on';  } else {    return 'off';  }}
export default function dnsPrefetchControl (requestResponse: RequestResponseInterface, options?: DnsPrefetchControlOptions) {  const headerValue = getHeaderValueFromOptions(options);
  requestResponse.setResponseHeader('X-DNS-Prefetch-Control', headerValue);}