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
-
Follow the Get started guide to install K8sGateway, set up a gateway resource, and deploy the httpbin sample app.
-
Get the external address of the gateway and save it in an environment variable.
export INGRESS_GW_ADDRESS=$(kubectl get svc -n gloo-system gloo-proxy-http -o jsonpath="{.status.loadBalancer.ingress[0]['hostname','ip']}") echo $INGRESS_GW_ADDRESS
kubectl port-forward deployment/gloo-proxy-http -n gloo-system 8080:8080
Set up query parameter matching
-
Create an HTTPRoute resource for the
match.example
domain that matches incoming requests with auser=me
query parameter.kubectl apply -f- <<EOF apiVersion: gateway.networking.k8s.io/v1 kind: HTTPRoute metadata: name: httpbin-match namespace: httpbin spec: parentRefs: - name: http namespace: gloo-system hostnames: - match.example rules: - matches: - queryParams: - type: Exact value: me name: user backendRefs: - name: httpbin port: 8000 EOF
-
Send a request to the
/status/200
path of the httpbin app on thematch.example
domain without any query parameters. Verify that your request is not forwarded to the httpbin app because no matching query parameter is found.curl -vik http://$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
-
Send a request to the
/status/200
path of the httpbin app on thematch.example
domain. This time, you provide theuser=me
query parameter. Verify that your request now succeeds and that you get back a 200 HTTP response code.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
You can remove the resources that you created in this guide.kubectl delete httproute httpbin-match -n httpbin