README.md

$ yarn
$ # or npm install
$ node dump.js
$ # from another tab
$ envoy -c envoy.yaml
$ # from another tab
$ curl localhost:10000

dump.js

const Server = require('http').Server;
const rawBody = require('raw-body');
const server = new Server(async (req, res) => {
  console.log(req.url);
  console.log(req.headers);
  console.log((await rawBody(req)).toString());
  res.statusCode = 503;
  res.end('ok');
});

server.listen(process.env.PORT || 8000);

envoy.yaml

admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address:
      protocol: TCP
      address: 127.0.0.1
      port_value: 9901
static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address:
        protocol: TCP
        address: 0.0.0.0
        port_value: 10000
    filter_chains:
    - filters:
      - name: envoy.http_connection_manager
        typed_config:
          "@type": type.googleapis.com/envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager
          stat_prefix: ingress_http
          route_config:
            name: local_route
            virtual_hosts:
            - name: local_service
              domains: ["*"]
              routes:
              - match:
                  prefix: "/"
                route:
                  timeout: 10s
                  retry_policy:
                    retry_on: 5xx
                    num_retries: 5
                    per_try_timeout: 5s
                    retry_host_predicate:
                    - name: envoy.retry_host_predicates.previous_hosts
                    - name: envoy.retry_host_predicates.previous_hosts
                    host_selection_retry_max_attempts: '5'
                    retriable_status_codes:
                    - 503
                  max_grpc_timeout: 10s
                  cluster: service_google
          http_filters:
          - name: envoy.router
  clusters:
  - name: service_google
    connect_timeout: 0.25s
    type: LOGICAL_DNS
    # Comment out the following line to test on v6 networks
    dns_lookup_family: V4_ONLY
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: service_google
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: localhost
                port_value: 8000

package.json

{
  "name": "hello",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "raw-body": "^2.4.1"
  }
}