Access service in remote Kubernetes cluster using ingress
https://wso2-apim-gateway/ is the URL that will point to the gateway service according to your configuration. This is defined by the host: wso2-apim-gateway part of your configuration. Note that your load balancer (172.17.17.100) is a private IP address, so you will need to be on the same network to access it.

I can't see any further configuration required, except perhaps TLS certifications - if you receive a 5xx response, you may want to check the logs of the ingress-nginx deployment/replicaset.