Envoy

https://github.com/envoyproxy/envoy/blob/main/examples/front-proxy/front-envoy.yaml

https://jvns.ca/blog/2018/10/27/envoy-basics/

https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/route/v3/route_components.proto#envoy-v3-api-msg-config-route-v3-virtualhost

envoy.yaml

admin:
  address:
    socket_address: { address: 127.0.0.1, port_value: 9901 }

static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address: { 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
          codec_type: AUTO
          route_config:
            name: local_route
            virtual_hosts:
            - name: local_service
              domains: ["*"]
              routes:
              - match: { prefix: "/" }
                route: { cluster: some_service }
          http_filters:
          - name: envoy.filters.http.router
            typed_config:
              "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
      transport_socket:
        name: envoy.transport_sockets.tls
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.DownstreamTlsContext
          common_tls_context:
            tls_certificates:
            # The following self-signed certificate pair is generated using:
            # $ openssl req -x509 -newkey rsa:2048 -keyout a/front-proxy-key.pem -out  a/front-proxy-crt.pem -days 3650 -nodes -subj '/CN=front-envoy'
            #
            # Instead of feeding it as an inline_string, certificate pair can also be fed to Envoy
            # via filename. Reference: https://envoyproxy.io/docs/envoy/latest/api-v3/config/core/v3/base.proto#config-core-v3-datasource.
            #
            # Or in a dynamic configuration scenario, certificate pair can be fetched remotely via
            # Secret Discovery Service (SDS). Reference: https://envoyproxy.io/docs/envoy/latest/configuration/security/secret.
            - certificate_chain:
                inline_string: |
                  -----BEGIN CERTIFICATE-----
                  MIICqDCCAZACCQCquzpHNpqBcDANBgkqhkiG9w0BAQsFADAWMRQwEgYDVQQDDAtm
                  cm9udC1lbnZveTAeFw0yMDA3MDgwMTMxNDZaFw0zMDA3MDYwMTMxNDZaMBYxFDAS
                  BgNVBAMMC2Zyb250LWVudm95MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC
                  AQEAthnYkqVQBX+Wg7aQWyCCb87hBce1hAFhbRM8Y9dQTqxoMXZiA2n8G089hUou
                  oQpEdJgitXVS6YMFPFUUWfwcqxYAynLK4X5im26Yfa1eO8La8sZUS+4Bjao1gF5/
                  VJxSEo2yZ7fFBo8M4E44ZehIIocipCRS+YZehFs6dmHoq/MGvh2eAHIa+O9xssPt
                  ofFcQMR8rwBHVbKy484O10tNCouX4yUkyQXqCRy6HRu7kSjOjNKSGtjfG+h5M8bh
                  10W7ZrsJ1hWhzBulSaMZaUY3vh5ngpws1JATQVSK1Jm/dmMRciwlTK7KfzgxHlSX
                  58ENpS7yPTISkEICcLbXkkKGEQIDAQABMA0GCSqGSIb3DQEBCwUAA4IBAQCmj6Hg
                  vwOxWz0xu+6fSfRL6PGJUGq6wghCfUvjfwZ7zppDUqU47fk+yqPIOzuGZMdAqi7N
                  v1DXkeO4A3hnMD22Rlqt25vfogAaZVToBeQxCPd/ALBLFrvLUFYuSlS3zXSBpQqQ
                  Ny2IKFYsMllz5RSROONHBjaJOn5OwqenJ91MPmTAG7ujXKN6INSBM0PjX9Jy4Xb9
                  zT+I85jRDQHnTFce1WICBDCYidTIvJtdSSokGSuy4/xyxAAc/BpZAfOjBQ4G1QRe
                  9XwOi790LyNUYFJVyeOvNJwveloWuPLHb9idmY5YABwikUY6QNcXwyHTbRCkPB2I
                  m+/R4XnmL4cKQ+5Z
                  -----END CERTIFICATE-----
              private_key:
                inline_string: |
                  -----BEGIN PRIVATE KEY-----
                  MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQC2GdiSpVAFf5aD
                  tpBbIIJvzuEFx7WEAWFtEzxj11BOrGgxdmIDafwbTz2FSi6hCkR0mCK1dVLpgwU8
                  VRRZ/ByrFgDKcsrhfmKbbph9rV47wtryxlRL7gGNqjWAXn9UnFISjbJnt8UGjwzg
                  Tjhl6EgihyKkJFL5hl6EWzp2Yeir8wa+HZ4Achr473Gyw+2h8VxAxHyvAEdVsrLj
                  zg7XS00Ki5fjJSTJBeoJHLodG7uRKM6M0pIa2N8b6HkzxuHXRbtmuwnWFaHMG6VJ
                  oxlpRje+HmeCnCzUkBNBVIrUmb92YxFyLCVMrsp/ODEeVJfnwQ2lLvI9MhKQQgJw
                  tteSQoYRAgMBAAECggEAeDGdEkYNCGQLe8pvg8Z0ccoSGpeTxpqGrNEKhjfi6NrB
                  NwyVav10iq4FxEmPd3nobzDPkAftfvWc6hKaCT7vyTkPspCMOsQJ39/ixOk+jqFx
                  lNa1YxyoZ9IV2DIHR1iaj2Z5gB367PZUoGTgstrbafbaNY9IOSyojCIO935ubbcx
                  DWwL24XAf51ez6sXnI8V5tXmrFlNXhbhJdH8iIxNyM45HrnlUlOk0lCK4gmLJjy9
                  10IS2H2Wh3M5zsTpihH1JvM56oAH1ahrhMXs/rVFXXkg50yD1KV+HQiEbglYKUxO
                  eMYtfaY9i2CuLwhDnWp3oxP3HfgQQhD09OEN3e0IlQKBgQDZ/3poG9TiMZSjfKqL
                  xnCABMXGVQsfFWNC8THoW6RRx5Rqi8q08yJrmhCu32YKvccsOljDQJQQJdQO1g09
                  e/adJmCnTrqxNtjPkX9txV23Lp6Ak7emjiQ5ICu7iWxrcO3zf7hmKtj7z+av8sjO
                  mDI7NkX5vnlE74nztBEjp3eC0wKBgQDV2GeJV028RW3b/QyP3Gwmax2+cKLR9PKR
                  nJnmO5bxAT0nQ3xuJEAqMIss/Rfb/macWc2N/6CWJCRT6a2vgy6xBW+bqG6RdQMB
                  xEZXFZl+sSKhXPkc5Wjb4lQ14YWyRPrTjMlwez3k4UolIJhJmwl+D7OkMRrOUERO
                  EtUvc7odCwKBgBi+nhdZKWXveM7B5N3uzXBKmmRz3MpPdC/yDtcwJ8u8msUpTv4R
                  JxQNrd0bsIqBli0YBmFLYEMg+BwjAee7vXeDFq+HCTv6XMva2RsNryCO4yD3I359
                  XfE6DJzB8ZOUgv4Dvluie3TB2Y6ZQV/p+LGt7G13yG4hvofyJYvlg3RPAoGAcjDg
                  +OH5zLN2eqah8qBN0CYa9/rFt0AJ19+7/smLTJ7QvQq4g0gwS1couplcCEnNGWiK
                  72y1n/ckvvplmPeAE19HveMvR9UoCeV5ej86fACy8V/oVpnaaLBvL2aCMjPLjPP9
                  DWeCIZp8MV86cvOrGfngf6kJG2qZTueXl4NAuwkCgYEArKkhlZVXjwBoVvtHYmN2
                  o+F6cGMlRJTLhNc391WApsgDZfTZSdeJsBsvvzS/Nc0burrufJg0wYioTlpReSy4
                  ohhtprnQQAddfjHP7rh2LGt+irFzhdXXQ1ybGaGM9D764KUNCXLuwdly0vzXU4HU
                  q5sGxGrC1RECGB5Zwx2S2ZY=
                  -----END PRIVATE KEY-----

  clusters:
  - name: some_service
    connect_timeout: 0.25s
    type: STATIC
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: some_service
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: x.x.x.y
                # port_value: 80
                port_value: 443
    transport_socket:
      name: envoy.transport_sockets.tls
      typed_config:
        "@type": type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.UpstreamTlsContext

sudo ./envoy -c envoy.yaml --log-level info

curl -k https://localhost:10000