LibHTTP+LibWeb: Accept Brotli encoded responses

Author: https://github.com/msvisser
Commit: 7278ad761e
Pull-request: https://github.com/SerenityOS/serenity/pull/13384
Reviewed-by: https://github.com/Lubrsi
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/creator1creeper1
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Libraries/LibWeb/Loader/ResourceLoader.cpp

@@ -225,7 +225,7 @@ void ResourceLoader::load(LoadRequest& request, Function<void(ReadonlyBytes, Has
 
         HashMap<String, String> headers;
         headers.set("User-Agent", m_user_agent);
-        headers.set("Accept-Encoding", "gzip, deflate");
+        headers.set("Accept-Encoding", "gzip, deflate, br");
 
         for (auto& it : request.headers()) {
             headers.set(it.key, it.value);