REST API router forward to Apollo GraphQL endpoinr - express

Question

I have a node/express/Apollo application to provide GraphQL service to the frontend application. I also have the REST API endpoing in the application to provide service for legacy applications. I want to forward the REST API calls to the GraphQL endpoint. For example:
From
GET /api/roles
to
POST /graphql
{ *body* }
I tried like this:
// app.js
import express from 'express';
import { ApolloServer } from 'apollo-server-express';
import routes from './routes';
const port = process.env.PORT || 8088;
const app = express();
app.use('/api/roles', routes.role);
const server = new ApolloServer({
......
},
});
server.applyMiddleware({ app, path: '/graphql' });
app.listen({ port: port }, () => {
console.log(`Apollo Server on http://localhost:${port}/graphql`);
});
// routes/role.js
import { Router } from 'express';
const router = Router();
router.get('/', (req, res, next) => {
req.url = '/graphql';
req.originalUrl = '/graphql';
req.method = 'POST';
req.body = `
{
findRoles {
data {
roleId
name
}
}
}`;
return router.handle(req, res, next);
});
It doesn't work and gives the error "Cannot POST /graphql". Any idea how to do it?