How to set CORs using Lacinia Pedestal? - server

Question

I'm setting up a lacinia-pedestal graphql server using Clojure, and attempting to access it with client-side javascript code using apollo. However, I'm unable to access the /graphql endpoint on localhost because I'm attempting to access it from a localhost origin (localhost:3000) that is not allowed by CORs. How do I set CORs using lacinia-pedestal?
Here is the server-side code (set up using the lacinia tutorial https://lacinia.readthedocs.io/en/latest/tutorial/component.html)
(ns project.server
(:require [com.stuartsierra.component :as component]
[com.walmartlabs.lacinia.pedestal :as lp]
[io.pedestal.http :as http]))
(defrecord Server [schema-provider server]
component/Lifecycle
(start [this]
(assoc this :server (-> schema-provider
:schema
(lp/service-map {:graphiql true})
http/create-server
http/start)))
(stop [this]
(http/stop server)
(assoc this :server nil)))
(defn new-server
[]
{:server (-> {}
map->Server
(component/using [:schema-provider]))})
Client-side code is super simple (using Apollo):
const client = new ApolloClient({
uri: "http://localhost:8888/graphql"
});

Answer 1

Update: I managed to solve it by merging my lacinia pedestal service map with a standard pedestal service map.
(start [this]
(assoc this :server (-> schema-provider
:schema
(lp/service-map {:graphiql true})
(merge {::http/allowed-origins (constantly true)})
http/create-server
http/start)))