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我在 scala Play Framework 中有 gRPC 服务器，它在端口 9000 上公开 gRPC hello world 示例服务。我正在尝试将它与 React Web 客户端连接。似乎我在使用部署到 Mac 上的 docker 容器的 Envoy 代理时遇到了连接问题。

我总是遇到同样的错误，我认为这意味着 Envoy 无法与后端连接：

​code: 2​
message: "Http response at 400 or 500 level"
​metadata: Object {  }

我构建 Envoy 的 docker 文件是：

FROM envoyproxy/envoy:v1.12.2
COPY ./envoy.yaml /etc/envoy/envoy.yaml
CMD /usr/local/bin/envoy -c /etc/envoy/envoy.yaml -l trace --log-path /tmp/envoy_info.log

我正在使用这个脚本构建它：

echo --- Building my-envoy docker image ---
docker build -t my-envoy:1.0 .

echo --- Running my-envoy docker image ---
docker run -d -p 8080:8080 -p 9901:9901 --network=host my-envoy:1.0

Envoy 配置在这个 yaml 文件中定义：

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: 8080 }
      filter_chains:
        - filters:
            - name: envoy.http_connection_manager
              config:
                codec_type: auto
                stat_prefix: ingress_http
                route_config:
                  name: local_route
                  virtual_hosts:
                    - name: local_service
                      domains: ["*"]
                      routes:
                        - match: { prefix: "/" }
                          route:
                            cluster: greeter_service
                            max_grpc_timeout: 0s
                      cors:
                        allow_origin:
                          - "*"
                        allow_methods: GET, PUT, DELETE, POST, OPTIONS
                        allow_headers: keep-alive,user-agent,cache-control,content-type,content-transfer-encoding,custom-header-1,x-accept-content-transfer-encoding,x-accept-response-streaming,x-user-agent,x-grpc-web,grpc-timeout
                        max_age: "1728000"
                        expose_headers: custom-header-1,grpc-status,grpc-message
                http_filters:
                  - name: envoy.grpc_web
                  - name: envoy.cors
                  - name: envoy.router
  clusters:
    - name: greeter_service
      connect_timeout: 0.25s
      type: logical_dns
      http2_protocol_options: {}
      lb_policy: round_robin
      hosts: [{ socket_address: { address: host.docker.internal, port_value: 9000 }}]

除了这些日志之外，我在特使日志文件中找不到任何相关内容：

[2020-12-15 01:28:18.747][8][debug][upstream] [source/common/upstream/logical_dns_cluster.cc:72] starting async DNS resolution for host.docker.internal
[2020-12-15 01:28:18.747][8][trace][upstream] [source/common/network/dns_impl.cc:160] Setting DNS resolution timer for 5000 milliseconds
[2020-12-15 01:28:18.748][8][trace][upstream] [source/common/network/dns_impl.cc:160] Setting DNS resolution timer for 5000 milliseconds
[2020-12-15 01:28:18.749][8][debug][upstream] [source/common/upstream/logical_dns_cluster.cc:79] async DNS resolution complete for host.docker.internal
[2020-12-15 01:28:21.847][8][debug][main] [source/server/server.cc:175] flushing stats
[2020-12-15 01:28:23.751][8][debug][upstream] [source/common/upstream/logical_dns_cluster.cc:72] starting async DNS resolution for host.docker.internal
[2020-12-15 01:28:23.751][8][trace][upstream] [source/common/network/dns_impl.cc:160] Setting DNS resolution timer for 5000 milliseconds
[2020-12-15 01:28:23.753][8][trace][upstream] [source/common/network/dns_impl.cc:160] Setting DNS resolution timer for 5000 milliseconds
[2020-12-15 01:28:23.753][8][debug][upstream] [source/common/upstream/logical_dns_cluster.cc:79] async DNS resolution complete for host.docker.internal
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