Deno standard library
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function mergeHeaders
import { mergeHeaders } from "";

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.