Can Router works with local routing_url?

[michaeldouglasdev]

Is it possible to use local routing_url with Apollo Router instead of Apollo Gateway?

In my project I have some local subgraphs (local schema and resolvers)

ex:

supergraph.yaml:

federation_version: =2.6.0
subgraphs:
  users:
    routing_url: http://users
    schema:
      file: ./src/subgraph-users/schema.graphql

const gateway = new ApolloGateway({
    supergraphSdl: readFileSync("./supergraph.graphql", "utf8"),
    buildService: ({ url }) => {
      if (url === 'http://users') {
        return new LocalGraphQLDataSource(usersSubgraph);
      }
      else {
        return new RemoteGraphQLDataSource({url})
      }
    }
  })

[SimonSapin]

With Apollo Router, subgraphs are always "remote" in the sense that they are on the other side of a network connection. Furthermore if your resolvers are written for Node.js, Apollo Router cannot run them inside of its own process. Consider running Apollo Server or some other GraphQL server separately. It can however be "local" on the same machine, with the URL specified as http://localhost:4001 (for example if the subgraph is listening on port 4001).