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Module

std/http/mod.ts>mergeHeaders

Deno standard library
denoland/deno_std
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The Standard Library has been moved to JSR. See the blog post for details.
function mergeHeaders
import { mergeHeaders } from "https://deno.land/std@0.192.0/http/mod.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.