[executors/ws] Allow to configure headers

.changeset/cuddly-ants-change.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/executor-graphql-ws': minor
+---
+
+Allow to configure headers of the WebSocket sent with the connection request.

packages/executors/graphql-ws/src/index.ts

@@ -13,6 +13,10 @@ const defaultPrintFn = memoize1(print);
 interface GraphQLWSExecutorOptions extends ClientOptions {
  onClient?: (client: Client) => void;
  print?: typeof print;
+ /**
+ * Additional headers to include when querying the original schema
+ */
+ headers?: Record<string, string>;
 }
 
 function isClient(client: Client | GraphQLWSExecutorOptions): client is Client {
@@ -31,8 +35,19 @@ export function buildGraphQLWSExecutor(
  if (clientOptionsOrClient.print) {
  printFn = clientOptionsOrClient.print;
  }
+
+ const webSocketImpl = clientOptionsOrClient.headers
+ ? class WebSocketWithHeaders extends WebSocket {
+ constructor(url: string, protocol: string) {
+ super(url, protocol, {
+ headers: (clientOptionsOrClient as GraphQLWSExecutorOptions).headers,
+ });
+ }
+ }
+ : WebSocket;
+
  graphqlWSClient = createClient({
- webSocketImpl: WebSocket,
+ webSocketImpl,
  lazy: true,
  ...clientOptionsOrClient,
  connectionParams: () => {