Switch to @nuxtjs/apollo module-style integration

server/api/graphql.post.ts

@@ -0,0 +1,25 @@
+export default defineEventHandler(async (event) => {
+  const config = useRuntimeConfig(event);
+  const body = await readBody(event);
+
+  const cookie = getHeader(event, 'cookie');
+  const userId = getHeader(event, 'x-user-id');
+
+  const response = await fetch(config.backendGraphqlUrl, {
+    method: 'POST',
+    headers: {
+      'content-type': 'application/json',
+      ...(cookie ? { cookie } : {}),
+      ...(userId ? { 'x-user-id': userId } : {}),
+    },
+    body: JSON.stringify(body),
+  });
+
+  setResponseStatus(event, response.status);
+  const contentType = response.headers.get('content-type');
+  if (contentType) {
+    setHeader(event, 'content-type', contentType);
+  }
+
+  return await response.json();
+});