For more information, see the Kubernetes Gateway API documentation.

Before you begin

  1. Follow the Get started guide to install Gloo Gateway, 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.

Set up HTTP method matching

  1. Create an HTTPRoute resource for the match.example domain that serves incoming GET requests for the httpbin app.

      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:
          - method: "GET"
          backendRefs:
            - name: httpbin
              port: 8000
    EOF 
      
  2. Send a GET request to the httpbin app on the match.example domain. Verify that you get back a 200 HTTP response code.

    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: *
    < content-type: application/json; encoding=utf-8
    content-type: application/json; encoding=utf-8
    < date: Sat, 04 Nov 2023 03:34:12 GMT
    date: Sat, 04 Nov 2023 03:34:12 GMT
    < content-length: 422
    content-length: 422
    < x-envoy-upstream-service-time: 1
    x-envoy-upstream-service-time: 1
    < server: envoy
    server: envoy
    
    < 
    {
      "args": {},
      "headers": {
        "Accept": [
          "*/*"
        ],
        "Host": [
          "match.example:8080"
        ],
        "User-Agent": [
          "curl/7.77.0"
        ],
        "X-Envoy-Expected-Rq-Timeout-Ms": [
          "15000"
        ],
        "X-Forwarded-Proto": [
          "http"
        ],
        "X-Request-Id": [
          "6823bc28-ba8e-47df-a3a0-1aa21628db0e"
        ]
      },
      "origin": "10.116.3.7:47022",
      "url": "http://match.example:8080/get"
    }
      
  3. Send another request to the httpbin app on the match.example domain. This time, you use the POST method. Verify that your request is not forwarded to the httpbin app and that you get back a 404 HTTP response code.

    Example output:

      * Mark bundle as not supporting multiuse
    < HTTP/1.1 404 Not Found
    HTTP/1.1 404 Not Found
    < date: Tue, 23 Apr 2024 18:47:53 GMT
    date: Tue, 23 Apr 2024 18:47:53 GMT
    < server: envoy
    server: envoy
    < content-length: 0
    content-length: 0 
    ...
      

Cleanup

You can optionally delete the HTTP route that you created as part of this guide.

  kubectl delete httproute httpbin-match -n httpbin