Using Forge, it would be something like this:
import api, { route } from "@forge/api";
const response = await api.asApp().requestJira(route`/rest/api/3/workflow/rule/config?types= postfunction`, {
headers: {
'Accept': 'application/json'
}
});
console.log(`Response: ${response.status} ${response.statusText}`);
console.log(await response.json());
Note that the URL you posted is missing types
, so it’d be https://jay.atlassian.net/rest/api/3/workflow/rule/config?types=postfunction
, but you shouldn’t be trying to access the URL directly, only through Forge or Connect apps.