How to add routes to an Api Gateway in a different stack?

Question

I split my stack into two pieces so I can have other developers work on the implementation of the apigatewayv2 routes, integrations, and lambdas.  I am trying to figure out how to reference the API Gateway. I thought I had it figured out:

```
HttpApi.fromHttpApiAttributes(stack, "my-api-gateway-id",
            {
                httpApiId: "something"
            }
);
```
but that returns an IHttpApi which doesn't have .addRoutes().  I tried casting it to HttpApi but that didn't work - it really doesn't have .addRoutes().  Not sure what to do.

How do I get an HttpApi rather than an IHttpApi?  Casting didn't work.

Answer

Figured it out.  You have to use HttpRoute to do this as described [here](https://github.com/aws/aws-cdk/issues/12337).  You don't `addRoutes()` you just create it.  The main difference is that you need to do this once for every method.

In my case, I pass in an array of methods, then add then one at a time:

```
       methods.forEach( (method) => {
            const routeId = id + "-" + method.toLowerCase();
            new HttpRoute(this.stack, routeId, {
                httpApi: this.api,
                routeKey: HttpRouteKey.with(props.path, method),
                integration: httpIntegration,
                authorizer: this.authorizer
            });
        });
```

How to add routes to an Api Gateway in a different stack?

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