Fix outgoing headers in /graphql

Fixes #4264

api/src/controllers/graphql.ts

@@ -1,4 +1,4 @@
-import { Router, Response } from 'express';
+import { Router } from 'express';
 import { graphqlHTTP } from 'express-graphql';
 import { GraphQLService } from '../services';
 import { respond } from '../middleware/respond';
@@ -27,6 +27,15 @@ router.use(
 
 		customResponse.json = customResponse.end = function (payload: Record<string, any>) {
 			res.locals.payload = payload;
+
+			if (customResponse.getHeader('content-type')) {
+				res.setHeader('Content-Type', customResponse.getHeader('content-type')!);
+			}
+
+			if (customResponse.getHeader('content-length')) {
+				res.setHeader('content-length', customResponse.getHeader('content-length')!);
+			}
+
 			return next();
 		} as any;
 

api/src/services/collections.ts

@@ -153,7 +153,7 @@ export class CollectionsService {
 		return Array.isArray(collection) ? collections : collections[0];
 	}
 
-	/** @todo, read by query without query support is a bit ironic, isnt it */
+	/** @todo, read by query without query support is a bit ironic, isn't it */
 	async readByQuery(): Promise<Collection[]> {
 		const collectionItemsService = new ItemsService('directus_collections', {
 			knex: this.knex,

api/src/services/graphql.ts

@@ -82,7 +82,17 @@ export class GraphQLService {
 	};
 
 	async getSchema() {
-		const collectionsInSystem = await this.collectionsService.readByQuery();
+		let collectionsInSystem: Collection[] = [];
+
+		// Collections service will throw an error if you don't have access to any collection.
+		// We still want GraphQL / GraphiQL to function though, even if you don't have access to `items`
+		// (you could still have access to auth/server/etc)
+		try {
+			collectionsInSystem = await this.collectionsService.readByQuery();
+		} catch {
+			collectionsInSystem = [];
+		}
+
 		const fieldsInSystem = await this.fieldsService.readAll();
 		const relationsInSystem = (await this.relationsService.readByQuery({})) as Relation[];