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Enable HTTP/2 on ingress resource

Voyager can enable HTTP/2 from version >=7.1.0

To enable http2, you must first setup a certificate (Let’s Encrypt), or use an existing one. Then create an ingress object like below:

apiVersion: voyager.appscode.com/v1beta1
kind: Ingress
metadata:
  name: haproxy-ingress # name of the ingress
  namespace: default # namespace (optional)
  annotations:
    ingress.appscode.com/replicas: '2'
    # ... other annotations
spec:
  tls:
  - hosts:
    - host.example.com
    ref:
      kind: Certificate
      name: host
  rules:
  - host: host.example.com
    http:
      paths:
      - path: "/"
        backend:
          serviceName: host-service
          servicePort: '8000'
      alpn:
      - h2
      - http/1.1
      - http/1.0

The important bit here is alpn. In this example the ingress can negotiate from HTTP/2 all the way down to HTTP/1.0. If alpn isn’t specified at all, the negotiated protocol will be HTTP/1.1 (default).

The above settings are reflected in the generated haproxy ConfigMap:

    bind *:443  ssl no-sslv3 no-tlsv10 no-tls-tickets crt /etc/ssl/private/haproxy/tls/  alpn h2,http/1.1,http/1.0

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