import { Request } from "https://deno.land/x/attain@1.1.2/mod.ts";
Returns an array of charsets, accepted by the requestor, in order of
preference. If there are no charsets supplied by the requestor,
undefined
is returned.
For a given set of charsets, return the best match accepted by the
requestor. If there are no charsets that match, then the method returns
undefined
.