Host redirect

Redirect requests to a different host.

For more information, see the Kubernetes Gateway API documentation.

Before you begin

1. Follow the Get started guide to install kgateway.

2. Follow the Sample app guide to create an API gateway proxy with an HTTP listener and deploy the httpbin sample app.

3. Get the external address of the gateway and save it in an environment variable.

   Cloud Provider LoadBalancerPort-forward for local testing

   export INGRESS_GW_ADDRESS=$(kubectl get svc -n kgateway-system http -o jsonpath="{.status.loadBalancer.ingress[0]['hostname','ip']}")
   echo $INGRESS_GW_ADDRESS  

   kubectl port-forward deployment/http -n kgateway-system 8080:8080

Set up host redirects

1. Create an HTTP route for the httpbin app that you created as part of the Get started guide. In the following example, requests for the host.redirect.example domain are redirected to the www.example.com hostname, and a 302 HTTP response code is returned to the user.

   kubectl apply -f- <<EOF
   apiVersion: gateway.networking.k8s.io/v1
   kind: HTTPRoute
   metadata:
     name: httpbin-redirect
     namespace: httpbin
   spec:
     parentRefs:
       - name: http
         namespace: kgateway-system
     hostnames:
       - host.redirect.example
     rules:
       - filters:
         - type: RequestRedirect
           requestRedirect:
             hostname: "www.example.com"
             statusCode: 302
   EOF

2. Send a request to the httpbin app on the host.redirect.example domain and verify that you get back a 302 HTTP response code and the redirect location www.example.com/headers.

   Cloud Provider LoadBalancerPort-forward for local testing

   curl -vik http://$INGRESS_GW_ADDRESS:8080/headers -H "host: host.redirect.example:8080"

   curl -vik localhost:8080/headers -H "host: host.redirect.example"

   Example output:

   * Mark bundle as not supporting multiuse
   < HTTP/1.1 302 Found
   HTTP/1.1 302 Found
   < location: http://www.example.com/headers
   location: http://www.example.com/headers
   < date: Sat, 04 Nov 2023 01:40:06 GMT
   date: Sat, 04 Nov 2023 01:40:06 GMT
   < server: envoy
   server: envoy
   < content-length: 0
   content-length: 0

Cleanup

kubectl delete httproute httpbin-redirect -n httpbin