import { Request } from "https://deno.land/x/oak@v12.5.0/mod.ts";
Returns an array of languages, accepted by the requestor, in order of
preference. If there are no languages supplied by the requestor,
["*"] is returned, indicating any language is accepted.
For a given set of languages, return the best match accepted by the
requestor. If there are no languages that match, then the method returns
undefined.