Handle options requests

Author: JoviDeCroock

handler/graphql.mjs

@@ -10,5 +10,12 @@
 import { createHandler } from 'graphql-http/lib/use/@netlify/functions';
 import schema from '../lib/schema';
 
+const graphqlHandler = createHandler({ schema: schema.default })
+
 // Create the GraphQL over HTTP native fetch handler
-export const handler = createHandler({ schema: schema.default });
+export const handler = (req, ctx) => {
+    if (req.httpMethod === 'OPTIONS') {
+        return { statusCode: 200 };
+    }
+    return graphqlHandler(req, ctx)
+};

netlify.toml

@@ -6,3 +6,4 @@
   for = "/graphql*"
   [headers.values]
     Access-Control-Allow-Origin = "*"
+    Access-Control-Allow-Headers = "*"