Query parameter

Specify a set of URL query parameters which requests must match in entirety.

For more information, see the Kubernetes Gateway API documentation.

Before you begin

1. Follow the Get started guide to install K8sGateway, set up a gateway resource, and deploy the httpbin sample app.

2. 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 gloo-system gloo-proxy-http -o jsonpath="{.status.loadBalancer.ingress[0]['hostname','ip']}")
   echo $INGRESS_GW_ADDRESS  

   kubectl port-forward deployment/gloo-proxy-http -n gloo-system 8080:8080

Set up query parameter matching

1. Create an HTTPRoute resource for the match.example domain that matches incoming requests with a user=me query parameter.

   kubectl apply -f- <<EOF
   apiVersion: gateway.networking.k8s.io/v1beta1
   kind: HTTPRoute
   metadata:
     name: httpbin-match
     namespace: httpbin
   spec:
     parentRefs:
       - name: http
         namespace: gloo-system
     hostnames:
       - match.example
     rules:
       - matches:
         - queryParams: 
             - type: Exact
               value: me
               name: user
         backendRefs:
           - name: httpbin
             port: 8000
   EOF 

2. Send a request to the /status/200 path of the httpbin app on the match.example domain without any query parameters. Verify that your request is not forwarded to the httpbin app because no matching query parameter is found.

   Cloud Provider LoadBalancerPort-forward for local testing

   curl -vik http://$INGRESS_GW_ADDRESS:8080/status/200 -H "host: match.example:8080"

   curl -vik localhost:8080/status/200 -H "host: match.example"

   Example output:

   * Mark bundle as not supporting multiuse
   < HTTP/1.1 404 Not Found
   HTTP/1.1 404 Not Found
   < date: Sat, 04 Nov 2023 03:45:39 GMT
   date: Sat, 04 Nov 2023 03:45:39 GMT
   < server: envoy
   server: envoy
   < content-length: 0
   content-length: 0

3. Send a request to the /status/200 path of the httpbin app on the match.example domain. This time, you provide the user=me query parameter. Verify that your request now succeeds and that you get back a 200 HTTP response code.

   Cloud Provider LoadBalancerPort-forward for local testing

   curl -vik http://$INGRESS_GW_ADDRESS:8080/status/200?user=me -H "host: match.example:8080"

   curl -vik localhost:8080/status/200?user=me -H "host: match.example"

   Example output:

   * Mark bundle as not supporting multiuse
   < HTTP/1.1 200 OK
   HTTP/1.1 200 OK
   < access-control-allow-credentials: true
   access-control-allow-credentials: true
   < access-control-allow-origin: *
   access-control-allow-origin: *
   < date: Sat, 04 Nov 2023 03:49:17 GMT
   date: Sat, 04 Nov 2023 03:49:17 GMT
   < content-length: 0
   content-length: 0
   < x-envoy-upstream-service-time: 1
   x-envoy-upstream-service-time: 1
   < server: envoy
   server: envoy

Cleanup

kubectl delete httproute httpbin-match -n httpbin