Envoy debugging from Slack

README.md

Looks like there was a problem with a react app's reloading websocket thingie. So I decided to test.

Here is a random react app that I decied to try: https://github.com/ahfarmer/calculator

$ npm start

Without an upgrade config:

[2020-02-25 01:13:26.243][4407][debug][http] [source/common/http/conn_manager_impl.cc:731] [C8][S17729359102081406356] request headers complete (end_stream=false): ':authority', '192.168.1.59:3001' ':path', '/sockjs-node' ':method', 'GET' 'connection', 'Upgrade' 'pragma', 'no-cache' 'cache-control', 'no-cache' 'user-agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.116 Safari/537.36' 'upgrade', 'websocket' 'origin', 'http://192.168.1.59:3001' 'sec-websocket-version', '13' 'accept-encoding', 'gzip, deflate' 'accept-language', 'en-US,en;q=0.9,ja;q=0.8,ca;q=0.7' 'sec-websocket-key', 'dXI0yvA/2pOHXIh5ZBqgfQ==' 'sec-websocket-extensions', 'permessage-deflate; client_max_window_bits'

[2020-02-25 01:13:26.243][4407][debug][http] [source/common/http/conn_manager_impl.cc:1417] [C8][S17729359102081406356] Sending local reply with details upgrade_failed [2020-02-25 01:13:26.243][4407][debug][http] [source/common/http/conn_manager_impl.cc:1615] [C8][S17729359102081406356] encoding headers via codec (end_stream=true): ':status', '403' 'date', 'Tue, 25 Feb 2020 06:13:26 GMT' 'server', 'envoy' 'connection', 'close'

With only the upgrade config... it works fine.

envoy.yaml

static_resources:
    listeners:
        - address:
              socket_address:
                  address: 0.0.0.0
                  port_value: 3001
          filter_chains:
              - filters:
                    - name: envoy.http_connection_manager
                      typed_config:
                          "@type": type.googleapis.com/envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager
                          codec_type: auto
                          stat_prefix: ingress_http
                          route_config:
                              name: local_route
                              virtual_hosts:
                                  - name: backend
                                    domains:
                                        - "*"
                                    routes:
                                        - match:
                                              prefix: "/"
                                          route:
                                              cluster: frontend
                                              upgrade_configs:
                                                  - upgrade_type: websocket
                                                    enabled: true
                          http_filters:
                              - name: envoy.router
                                typed_config: {}
    clusters:
        - name: frontend
          connect_timeout: 0.25s
          type: strict_dns
          lb_policy: round_robin
          #http2_protocol_options: {}
          dns_lookup_family: V4_ONLY # new
          load_assignment:
              cluster_name: frontend
              endpoints:
                  - lb_endpoints:
                        - endpoint:
                              address:
                                  socket_address:
                                      address: localhost
                                      port_value: 3000
admin:
    access_log_path: "/dev/null"
    address:
        socket_address:
            address: 0.0.0.0
            port_value: 9901