Simpistic Squid forward proxy replacement with Envoy

proxy-config.yaml

admin:
  access_log_path: /dev/stdout
  address:
    socket_address:
      address: 127.0.0.1
      protocol: TCP
      port_value: 9901
static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address:
        address: 0.0.0.0
        protocol: TCP
        port_value: 48080
    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
          access_log:
            - name: envoy.file_access_log
              typed_config:
                "@type": "type.googleapis.com/envoy.extensions.access_loggers.file.v3.FileAccessLog"
                path: /dev/stdout
          stat_prefix: proxy
          http2_protocol_options:
            allow_connect: true
          upgrade_configs:
            - upgrade_type: CONNECT
          route_config:
            name: local_route
            virtual_hosts:
            - name: http
              domains:
              - '*'
              routes:

              - match:
                  connect_matcher:
                    {}
                route:
                  cluster: dynamic_forward_proxy_cluster
                  upgrade_configs:
                  - upgrade_type: CONNECT
                    connect_config:
                      {}
              - match:
                  prefix: /
                route:
                  cluster: dynamic_forward_proxy_cluster
                typed_per_filter_config:
                  envoy.filters.http.dynamic_forward_proxy:
                    '@type': type.googleapis.com/envoy.extensions.filters.http.dynamic_forward_proxy.v3.PerRouteConfig
                    host_rewrite_header: X-Host-Port
          http_filters:
          - name: envoy.filters.http.dynamic_forward_proxy
            typed_config:
              '@type': type.googleapis.com/envoy.extensions.filters.http.dynamic_forward_proxy.v3.FilterConfig
              dns_cache_config:
                name: dynamic_forward_proxy_cache_config
                dns_lookup_family: V4_ONLY
          - name: envoy.filters.http.router
            typed_config:
              "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
  clusters:
  - name: dynamic_forward_proxy_cluster
    connect_timeout: 1s
    lb_policy: CLUSTER_PROVIDED
    cluster_type:
      name: envoy.clusters.dynamic_forward_proxy
      typed_config:
        '@type': type.googleapis.com/envoy.extensions.clusters.dynamic_forward_proxy.v3.ClusterConfig
        dns_cache_config:
          name: dynamic_forward_proxy_cache_config
          dns_lookup_family: V4_ONLY