import { mergeHeaders } from "https://deno.land/x/frugal@0.5.0/docs/dep/std/http.ts";
Allows merging of various sources of headers into a final set of headers
which can be used in a Response.
Note, that unlike when passing a Response or Headers used in a
response to CookieMap or SecureCookieMap, merging
will not ensure that there are no other Set-Cookie headers from other
sources, it will simply append the various headers together.
Parameters
...sources: (Headered | HeadersInit | Mergeable)[]