title: Unable to forward API calls through Envoy (v1.17.0) to their respective routes inside docker-compose (v1.27.4)
body: <p><strong>tl;dnr</strong></p>
  <p>I can not get my docker-compose Envoy API gateway to properly forward to referenced services.</p>
  <p>&quot;Forwarded routes&quot; always end up with the error:</p>
  <pre>upstream connect error or disconnect/reset before headers. reset reason: connection termination</pre>
  <p>I must have mucked up something simple since this is so difficult to resolve. Any additional assistance would be appreciated.</p>
  <p><strong>Apologies for the length, the nitty-gritty!</strong></p>
  <p>Hello folks, this is the first time I've attemped to use Envoy as my API gateway, and can not seem to get past the above error. Basically I have two .Net 5 services, tags and docs, inside individual docker containers with their ports exposed. I would like to use Envoy as a simple API gateway (no https yet) just to redirect traffic to the proper service based on a simple route match.</p>
  <p>Now, I've been using a number of online examples as the basis for my experiment, so I have had to gone wrong somewhere. Any drection pointing would be greatly appreciated. I have verified all of the following:</p>
  <ol>
  <li>I can access my web services directly from my desktop by using both &quot;http://localhost:[portid]&quot; and &quot;http://host.docker.internal:[portid]&quot;</li>
  <li>From the envoy docker cli instance, I can properly resolve the internal IP (docker-compose) addresses of the services.</li>
  <li>From the envoy docker cli instance, I can <code>curl http://localapp-tags/api/Cats</code> successfully.</li>
  <li>Externally, I can navigate to &quot;http://host.docker.internal:10000&quot; and see the Envoy home page.</li>
  <li>NO MATTER WHAT I DO, I can not redirect to my service externally using &quot;http://localhost:10080/t/api/Cats&quot; for example. (trace dump below)</li>
  </ol>
  <p>Sites I've used as reference or ran locally to base my application's config file[s] on:</p>
  <ol>
  <li>Envoy Docs, <a href="https://www.envoyproxy.io/docs/envoy/latest/start/quick-start/configuration-static" rel="nofollow noreferrer">Static Configuration w/ the Default demo file</a></li>
  <li>Envoy Docs, <a href="https://www.envoyproxy.io/docs/envoy/latest/start/sandboxes/front_proxy.html" rel="nofollow noreferrer">Front Proxy</a> &amp; <a href="https://blog.turbinelabs.io/getting-started-with-envoy-on-your-laptop-1b1a7073fd8e" rel="nofollow noreferrer">Blog Post</a></li>
  <li>Reference Architecture used as a guide, <a href="https://docs.microsoft.com/en-us/dotnet/architecture/cloud-native/introduce-eshoponcontainers-reference-app" rel="nofollow noreferrer">.Net eShopOnContainers</a></li>
  <li><a href="https://docs.microsoft.com/en-us/aspnet/core/security/docker-compose-https?view=aspnetcore-5.0" rel="nofollow noreferrer">Hosting Reference</a></li>
  <li>Tutorial, <a href="https://www.youtube.com/watch?v=UsoH5cqE1OA" rel="nofollow noreferrer">Build an API Gateway with Envoy and use with .NET Core APIs</a> (<em>great resource &lt;?&gt;</em>)</li>
  </ol>
  <p>After Googling for hours (too many sites/links to list), the most concrete suggestion was to increase the <code>connection_timeout</code> from .25s to 30secs, this did not make any difference for me. So while I know there seems to be answers out there (and this may be a duplicate), in fact nothing else solved the problem :(</p>
  <p>I've also tried to create a named network inside docker-compose (eg. Front-Proxy example, but this did not work either!)</p>
  <p>Again, any other suggestions to look into would be appreciated.</p>
  <p>So as you can see, I went through a number of tutorials and baby-steps before I came up with my own docker-compose and envoy config files.</p>
  <p><strong>docker-compose.yaml</strong> (some parts left out for brevity, also disregard spelling errors as I did a search and replace and may have missed something)</p>
  <pre>
  #   Edge/Api Gateway
      localapp-gw:
        image: ${REGISTRY:}/localapp.apigw:${PLATFORM:-linux}-${TAG:-latest}    
        build:
          context: ./server-conf/envoy
        ports:
          - "9901:9901"
          - "10000:10000"
          - "10001:10001"
          - "10080:10080"
          - "10443:10443"
        volumes:
          - ./server-conf/envoy/envoy.yaml:/etc/envoy/envoy.yaml
     
  #   Backend APIS
      localapp-tags:
        image: ${REGISTRY:}/localapp.tags:${PLATFORM:-linux}-${TAG:-latest}
        build:
          context: .
          dockerfile: code/Services/Tag/localapp.tags/Dockerfile
        environment:
          - ASPNETCORE_ENVIRONMENT=Development
          - ASPNETCORE_URLS=http://+:80; 
          - GRPC_PORT=81
          - PORT=80
        ports:
          - "32080:80"
          - "32081:81"
          - "32443:443"
        volumes:
          - ${APPDATA}/Microsoft/UserSecrets:/root/.microsoft/usersecrets:ro
          - ${USERPROFILE}/.aspnet/https:/root/.aspnet/https:ro
              
      localapp-docs:
        image: ${REGISTRY:}/localapp.docs:${PLATFORM:-linux}-${TAG:-latest}
        build:
          context: .
          dockerfile: code/Services/Document/localapp.docs/Dockerfile        
        environment:
          - ASPNETCORE_ENVIRONMENT=Development
          - ASPNETCORE_URLS=http://+:80; 
          - GRPC_PORT=81
          - PORT=80
        ports:
          - "36080:80"
          - "36081:81"
          - "36443:443"
        volumes:
          - ${APPDATA}/Microsoft/UserSecrets:/root/.microsoft/usersecrets:ro
          - ${USERPROFILE}/.aspnet/https:/root/.aspnet/https:ro
  </pre>
  <p><strong>envoy.yaml</strong></p>
  <pre>
  admin:
    access_log_path: /tmp/admin_access.log
    address:
      socket_address:
        address: 0.0.0.0
        port_value: 9901
  
  static_resources:
    listeners:
    - name: listener_0
      address:
        socket_address:
          address: 0.0.0.0
          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
            access_log:
            - name: envoy.access_loggers.file
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.access_loggers.file.v3.FileAccessLog
                path: /tmp/stdout
            http_filters:
            - name: envoy.filters.http.router
            route_config:
              name: local_route
              virtual_hosts:
              - name: local_service
                domains: ["*"]
                routes:
                - match:
                    prefix: "/"
                  route:
                    host_rewrite_literal: www.envoyproxy.io
                    cluster: service_envoyproxy_io
    
    - name: listener_10080
      address:
        socket_address:
          address: 0.0.0.0
          port_value: 10080
      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
            codec_type: auto
            stat_prefix: ingress_http
            route_config:
              name: onecore_route
              virtual_hosts:
              - name: localapp_services
                domains: ["*"]
                routes:
                - match: { prefix: "/t/" }
                  route:
                    cluster: tags_service
                    auto_host_rewrite: true
                    idle_timeout: 10s 
                - match: { prefix: "/d/" }
                  route:
                    cluster: docs_service
                    auto_host_rewrite: true
                    idle_timeout: 10s 
            http_filters:
            - name: envoy.filters.http.router
              typed_config: {}
    
    clusters:
    - name: service_envoyproxy_io
      connect_timeout: 30s
      type: LOGICAL_DNS
      dns_lookup_family: V4_ONLY
      load_assignment:
        cluster_name: service_envoyproxy_io
        endpoints:
        - lb_endpoints:
          - endpoint:
              address:
                socket_address:
                  address: www.envoyproxy.io
                  port_value: 443
      transport_socket:
        name: envoy.transport_sockets.tls
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.UpstreamTlsContext
          sni: www.envoyproxy.io
    
    - name: tags_service
      connect_timeout: 30s
      type: strict_dns
      lb_policy: round_robin
      http2_protocol_options: {}
      load_assignment:
        cluster_name: tags_service
        endpoints:
        - lb_endpoints:
          - endpoint:
              address:
                socket_address:
                  address: localapp-tags
                  port_value: 80
    
    - name: docs_service
      connect_timeout: 30s
      type: strict_dns
      lb_policy: round_robin
      http2_protocol_options: {}
      load_assignment:
        cluster_name: docs_service
        endpoints:
        - lb_endpoints:
          - endpoint:
              address:
                socket_address:
                  address: localapp-docs
                  port_value: 80
  
  layered_runtime:
    layers:
      - name: static_layer_0
        static_layer:
          envoy:
            resource_limits:
              listener:
                example_listener_name:
                  connection_limit: 10000
  </pre>
  <p>So yeah, I'm a bit stuck here trying to figure out what I missed/botched up (but I could just be code blind after these two weeks). The envoy.yaml file was copied from reference material, so I'm just missing something obvious (and hopefully it is not just an ico issue!).</p>
  <p>There are a few errors in the tracelog, including the main one above, but I am not yet able to figure out the issue (or to appreciate/understand the tracelog)! Excerpt:</p>
  <pre>
  [2021-02-28 10:51:10.705][17][trace][misc] [source/common/event/scaled_range_timer_manager_impl.cc:60] enableTimer called on 0x1e07bf442380 for 3600000ms, min is 3600000ms
  [2021-02-28 10:51:10.705][17][debug][conn_handler] [source/server/connection_handler_impl.cc:501] [C2] new connection
  [2021-02-28 10:51:10.705][17][trace][connection] [source/common/network/connection_impl.cc:548] [C2] socket event: 2
  [2021-02-28 10:51:10.705][17][trace][connection] [source/common/network/connection_impl.cc:657] [C2] write ready
  [2021-02-28 10:51:10.707][17][trace][connection] [source/common/network/connection_impl.cc:548] [C2] socket event: 3
  [2021-02-28 10:51:10.707][17][trace][connection] [source/common/network/connection_impl.cc:657] [C2] write ready
  [2021-02-28 10:51:10.707][17][trace][connection] [source/common/network/connection_impl.cc:586] [C2] read ready. dispatch_buffered_data=false
  [2021-02-28 10:51:10.707][17][trace][connection] [source/common/network/raw_buffer_socket.cc:25] [C2] read returns: 357
  [2021-02-28 10:51:10.707][17][trace][connection] [source/common/network/raw_buffer_socket.cc:39] [C2] read error: Resource temporarily unavailable
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:571] [C2] parsing 357 bytes
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:847] [C2] message begin
  [2021-02-28 10:51:10.708][17][debug][http] [source/common/http/conn_manager_impl.cc:254] [C2] new stream
  [2021-02-28 10:51:10.708][17][trace][misc] [source/common/event/scaled_range_timer_manager_impl.cc:60] enableTimer called on 0x1e07bf442400 for 300000ms, min is 300000ms
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:494] [C2] completed header: key=Host value=host.docker.internal:10080
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:494] [C2] completed header: key=User-Agent value=Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:494] [C2] completed header: key=Accept value=text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:494] [C2] completed header: key=Accept-Language value=en-US,en;q=0.5
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:494] [C2] completed header: key=Accept-Encoding value=gzip, deflate
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:494] [C2] completed header: key=Connection value=keep-alive
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:699] [C2] onHeadersCompleteBase
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:494] [C2] completed header: key=Upgrade-Insecure-Requests value=1
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:952] [C2] Server: onHeadersComplete size=7
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:823] [C2] message complete
  [2021-02-28 10:51:10.708][17][trace][connection] [source/common/network/connection_impl.cc:346] [C2] readDisable: disable=true disable_count=0 state=0 buffer_length=357
  [2021-02-28 10:51:10.708][17][debug][http] [source/common/http/conn_manager_impl.cc:886] [C2][S9636672460028773107] request headers complete (end_stream=true):
  ':authority', 'host.docker.internal:10080'
  ':path', '/t/api/Tags'
  ':method', 'GET'
  'user-agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0'
  'accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
  'accept-language', 'en-US,en;q=0.5'
  'accept-encoding', 'gzip, deflate'
  'connection', 'keep-alive'
  'upgrade-insecure-requests', '1'
  [2021-02-28 10:51:10.708][17][debug][http] [source/common/http/filter_manager.cc:755] [C2][S9636672460028773107] request end stream
  [2021-02-28 10:51:10.708][17][debug][router] [source/common/router/router.cc:425] [C2][S9636672460028773107] cluster 'tags_service' match for URL '/t/api/Tags'
  [2021-02-28 10:51:10.708][17][debug][router] [source/common/router/router.cc:582] [C2][S9636672460028773107] router decoding headers:
  ':authority', 'host.docker.internal:10080'
  ':path', '/t/api/Tags'
  ':method', 'GET'
  ':scheme', 'http'
  'user-agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0'
  'accept', 'text/html,ap
  plication/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
  'accept-language', 'en-US,en;q=0.5'
  'accept-encoding', 'gzip, deflate'
  'upgrade-insecure-requests', '1'
  'x-forwarded-proto', 'http'
  'x-request-id', 'd3ddb11a-85bb-479e-a29f-b850439d04aa'
  'x-envoy-expected-rq-timeout-ms', '15000'
  [2021-02-28 10:51:10.708][17][debug][pool] [source/common/http/conn_pool_base.cc:79] queueing stream due to no available connections
  [2021-02-28 10:51:10.708][17][debug][pool] [source/common/conn_pool/conn_pool_base.cc:106] creating a new connection
  [2021-02-28 10:51:10.708][17][debug][client] [source/common/http/codec_client.cc:41] [C3] connecting
  [2021-02-28 10:51:10.708][17][debug][connection] [source/common/network/connection_impl.cc:860] [C3] connecting to 172.18.0.11:80
  [2021-02-28 10:51:10.708][17][debug][connection] [source/common/network/connection_impl.cc:876] [C3] connection in progress
  [2021-02-28 10:51:10.708][17][trace][http2] [source/common/http/http2/codec_impl.cc:1355] Codec does not have Metadata frame support.
  [2021-02-28 10:51:10.708][17][debug][http2] [source/common/http/http2/codec_impl.cc:1184] [C3] updating connection-level initial window size to 268435456
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/filter_manager.cc:498] [C2][S9636672460028773107] decode headers called: filter=0x1e07bf442100 status=1
  [2021-02-28 10:51:10.708][17][trace][misc] [source/common/event/scaled_range_timer_manager_impl.cc:60] enableTimer called on 0x1e07bf442400 for 10000ms, min is 10000ms
  [2021-02-28 10:51:10.708][17][trace][http] [source/common/http/http1/codec_impl.cc:620] [C2] parsed 357 bytes
  [2021-02-28 10:51:10.708][17][trace][connection] [source/common/network/connection_impl.cc:548] [C2] socket event: 2
  [2021-02-28 10:51:10.708][17][trace][connection] [source/common/network/connection_impl.cc:657] [C2] write ready
  [2021-02-28 10:51:10.708][17][trace][connection] [source/common/network/connection_impl.cc:548] [C3] socket event: 2
  [2021-02-28 10:51:10.708][17][trace][connection] [source/common/network/connection_impl.cc:657] [C3] write ready
  [2021-02-28 10:51:10.708][17][debug][connection] [source/common/network/connection_impl.cc:666] [C3] connected
  [2021-02-28 10:51:10.708][17][trace][connection] [source/common/network/connection_impl.cc:407] [C3] raising connection event 2
  [2021-02-28 10:51:10.708][17][debug][client] [source/common/http/codec_client.cc:80] [C3] connected
  [2021-02-28 10:51:10.708][17][debug][pool] [source/common/conn_pool/conn_pool_base.cc:225] [C3] attaching to next stream
  [2021-02-28 10:51:10.708][17][debug][pool] [source/common/conn_pool/conn_pool_base.cc:130] [C3] creating stream
  [2021-02-28 10:51:10.708][17][debug][router] [source/common/router/upstream_request.cc:354] [C2][S9636672460028773107] pool ready
  [2021-02-28 10:51:10.708][17][trace][http2] [source/common/http/http2/codec_impl.cc:946] [C3] send data: bytes=24
  [2021-02-28 10:51:10.708][17][trace][connection] [source/common/network/connection_impl.cc:465] [C3] writing 24 bytes, end_stream false
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:924] [C3] about to send frame type=4, flags=0
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:946] [C3] send data: bytes=39
  [2021-02-28 10:51:10.709][17][trace][connection] [source/common/network/connection_impl.cc:465] [C3] writing 39 bytes, end_stream false
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:853] [C3] sent frame type=4
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:924] [C3] about to send frame type=8, flags=0
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:946] [C3] send data: bytes=13
  [2021-02-28 10:51:10.709][17][trace][connection] [source/common/network/connection_impl.cc:465] [C3] writing 13 bytes, end_stream false
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:853] [C3] sent frame type=8
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:924] [C3] about to send frame type=1, flags=5
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:946] [C3] send data: bytes=282
  [2021-02-28 10:51:10.709][17][trace][connection] [source/common/network/connection_impl.cc:465] [C3] writing 282 bytes, end_stream false
  [2021-02-28 10:51:10.709][17][trace][http2] [source/common/http/http2/codec_impl.cc:853] [C3] sent frame type=1
  [2021-02-28 10:51:10.709][17][trace][connection] [source/common/network/connection_impl.cc:657] [C3] write ready
  [2021-02-28 10:51:10.709][17][trace][connection] [source/common/network/raw_buffer_socket.cc:68] [C3] write returns: 358
  [2021-02-28 10:51:10.709][17][trace][connection] [source/common/network/connection_impl.cc:548] [C3] socket event: 2
  [2021-02-28 10:51:10.709][17][trace][connection] [source/common/network/connection_impl.cc:657] [C3] write ready
  [2021-02-28 10:51:10.714][17][trace][connection] [source/common/network/connection_impl.cc:548] [C3] socket event: 3
  [2021-02-28 10:51:10.714][17][trace][connection] [source/common/network/connection_impl.cc:657] [C3] write ready
  [2021-02-28 10:51:10.714][17][trace][connection] [source/common/network/connection_impl.cc:586] [C3] read ready. dispatch_buffered_data=false
  [2021-02-28 10:51:10.714][17][trace][connection] [source/common/network/raw_buffer_socket.cc:25] [C3] read returns: 135
  [2021-02-28 10:51:10.714][17][trace][connection] [source/common/network/raw_buffer_socket.cc:39] [C3] read error: Resource temporarily unavailable
  [2021-02-28 10:51:10.714][17][trace][http2] [source/common/http/http2/codec_impl.cc:644] [C3] dispatching 135 bytes
  [2021-02-28 10:51:10.714][17][debug][http2] [source/common/http/http2/codec_impl.cc:890] [C3] invalid http2: Remote peer returned unexpected data while we expected SETTINGS frame. Perhaps, peer does not support HTTP/2 properly.
  [2021-02-28 10:51:10.714][17][trace][http2] [source/common/http/http2/codec_impl.cc:671] [C3] dispatched 135 bytes
  [2021-02-28 10:51:10.714][17][trace][http2] [source/common/http/http2/codec_impl.cc:924] [C3] about to send frame type=7, flags=0
  [2021-02-28 10:51:10.714][17][trace][http2] [source/common/http/http2/codec_impl.cc:946] [C3] send data: bytes=34
  [2021-02-28 10:51:10.714][17][trace][connection] [source/common/network/connection_impl.cc:465] [C3] writing 34 bytes, end_stream false
  [2021-02-28 10:51:10.715][17][trace][http2] [source/common/http/http2/codec_impl.cc:853] [C3] sent frame type=7
  [2021-02-28 10:51:10.715][17][debug][http2] [source/common/http/http2/codec_impl.cc:856] [C3] sent goaway code=1
  [2021-02-28 10:51:10.715][17][debug][client] [source/common/http/codec_client.cc:137] [C3] Error dispatching received data: The user callback function failed
  [2021-02-28 10:51:10.715][17][debug][connection] [source/common/network/connection_impl.cc:132] [C3] closing data_to_write=34 type=1
  [2021-02-28 10:51:10.715][17][trace][connection] [source/common/network/raw_buffer_socket.cc:68] [C3] write returns: 34
  [2021-02-28 10:51:10.715][17][debug][connection] [source/common/network/connection_impl.cc:241] [C3] closing socket: 1
  [2021-02-28 10:51:10.715][17][trace][connection] [source/common/network/connection_impl.cc:407] [C3] raising connection event 1
  [2021-02-28 10:51:10.716][17][debug][client] [source/common/http/codec_client.cc:99] [C3] disconnect. resetting 1 pending requests
  [2021-02-28 10:51:10.716][17][debug][client] [source/common/http/codec_client.cc:125] [C3] request reset
  [2021-02-28 10:51:10.716][17][trace][main] [source/common/event/dispatcher_impl.cc:213] item added to deferred deletion list (size=1)
  [2021-02-28 10:51:10.716][17][debug][pool] [source/common/conn_pool/conn_pool_base.cc:159] [C3] destroying stream: 0 remaining
  [2021-02-28 10:51:10.716][17][debug][router] [source/common/router/router.cc:1026] [C2][S9636672460028773107] upstream reset: reset reason: connection termination, transport failure reason:
  [2021-02-28 10:51:10.716][17][debug][http] [source/common/http/filter_manager.cc:839] [C2][S9636672460028773107] Sending local reply with details upstream_reset_before_response_started{connection termination}
  [2021-02-28 10:51:10.716][17][trace][misc] [source/common/event/scaled_range_timer_manager_impl.cc:60] enableTimer called on 0x1e07bf442400 for 10000ms, min is 10000ms
  [2021-02-28 10:51:10.716][17][debug][http] [source/common/http/conn_manager_impl.cc:1484] [C2][S9636672460028773107] encoding headers via codec (end_stream=false):
  ':status', '503'
  'content-length', '95'
  'content-type', 'text/plain'
  'date', 'Sun, 28 Feb 2021 10:51:10 GMT'
  'server', 'envoy'
  [2021-02-28 10:51:10.716][17][trace][connection] [source/common/network/connection_impl.cc:465] [C2] writing 134 bytes, end_stream false
  [2021-02-28 10:51:10.716][17][trace][misc] [source/common/event/scaled_range_timer_manager_impl.cc:60] enableTimer called on 0x1e07bf442400 for 10000ms, min is 10000ms
  [2021-02-28 10:51:10.716][17][trace][http] [source/common/http/conn_manager_impl.cc:1493] [C2][S9636672460028773107] encoding data via codec (size=95 end_stream=true)
  [2021-02-28 10:51:10.716][17][trace][connection] [source/common/network/connection_impl.cc:465] [C2] writing 95 bytes, end_stream false
  [2021-02-28 10:51:10.716][17][trace][connection] [source/common/network/connection_impl.cc:346] [C2] readDisable: disable=false disable_count=1 state=0 buffer_length=0
  [2021-02-28 10:51:10.716][17][trace][main] [source/common/event/dispatcher_impl.cc:213] item added to deferred deletion list (size=2)
  [2021-02-28 10:51:10.716][17][trace][misc] [source/common/event/scaled_range_timer_manager_impl.cc:60] enableTimer called on 0x1e07bf442380 for 3600000ms, min is 3600000ms
  [2021-02-28 10:51:10.716][17][debug][pool] [source/common/conn_pool/conn_pool_base.cc:343] [C3] client disconnected, failure reason:
  [2021-02-28 10:51:10.716][17][trace][main] [source/common/event/dispatcher_impl.cc:213] item added to deferred deletion list (size=3)
  [2021-02-28 10:51:10.716][17][trace][main] [source/common/event/dispatcher_impl.cc:89] clearing deferred deletion list (size=3)
  [2021-02-28 10:51:10.716][17][trace][connection] [source/common/network/connection_impl.cc:548] [C2] socket event: 2
  [2021-02-28 10:51:10.716][17][trace][connection] [source/common/network/connection_impl.cc:657] [C2] write ready
  [2021-02-28 10:51:10.716][17][trace][connection] [source/common/network/raw_buffer_socket.cc:68] [C2] write returns: 229
  [2021-02-28 10:51:10.747][17][trace][connection] [source/common/network/connection_impl.cc:548] [C2] socket event: 3
  [2021-02-28 10:51:10.747][17][trace][connection] [source/common/network/connection_impl.cc:657] [C2] write ready
  [2021-02-28 10:51:10.747][17][trace][connection] [source/common/network/connection_impl.cc:586] [C2] read ready. dispatch_buffered_data=false
  [2021-02-28 10:51:10.747][17][trace][connection] [source/common/network/raw_buffer_socket.cc:25] [C2] read returns: 323
  [2021-02-28 10:51:10.747][17][trace][connection] [source/common/network/raw_buffer_socket.cc:39] [C2] read error: Resource temporarily unavailable
  </pre>
  <p>Full trace log from the above session ... <a href="https://drive.google.com/drive/folders/154XKAW0GrM__3I5tJVEDezmut3Y802WK" rel="nofollow noreferrer">here</a>.</p>
  <p>Apologies and thanks in advance for any pointing or suggestions. I can provide any missing reference docs as needed.</p>
  <p>Thanks Again!</p>