encapsulate_http_in_http2_connect.yaml

# This configuration takes incoming HTTP requests on port 10000 and encapsulates it in a CONNECT
# request which is sent upstream port 10001.
# `curl -H 'Host: www.google.com' --resolve www.google.com:10000:127.0.0.1 https://www.google.com:10000`
bootstrap_extensions:
- name: envoy.bootstrap.internal_listener
  typed_config:
    "@type": type.googleapis.com/envoy.extensions.bootstrap.internal_listener.v3.InternalListener
static_resources:
  listeners:
  - name: http
    address:
      socket_address:
        protocol: TCP
        address: 127.0.0.1
        port_value: 10000
    filter_chains:
    - filters:
      - name: envoy.filters.network.http_connection_manager
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
          stat_prefix: ingress_http
          route_config:
            name: local_route
            virtual_hosts:
            - name: local_service
              domains: ["*"]
              routes:
              - match:
                  prefix: "/"
                route:
                  cluster: encap_cluster
          http_filters:
          - name: envoy.filters.http.router
            typed_config:
              "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
  - name: encap
    internal_listener: {}
    filter_chains:
    - filters:
      - name: tcp
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy
          stat_prefix: tcp_stats
          cluster: cluster_0
          tunneling_config:
            hostname: host.com:443
  clusters:
  - name: encap_cluster
    load_assignment:
      cluster_name: encap_cluster
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              envoy_internal_address:
                server_listener_name: encap
  - name: cluster_0
    # This ensures HTTP/2 CONNECT is used for establishing the tunnel.
    typed_extension_protocol_options:
      envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
        "@type": type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
        explicit_http_config:
          http2_protocol_options: {}
    load_assignment:
      cluster_name: cluster_0
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: 127.0.0.1
                port_value: 10001