kong grpc gateway网关插件报failed to transcode .proto错误是什么原因？

Question

我的grpc服务是 127.0.0.1:8882 或 192.168.0.13:8882

我的Kong配置的服务与路由：

#services:
{
    "tags":
    [],
    "ca_certificates": null,
    "read_timeout": 60000,
    "write_timeout": 60000,
    "host": "192.168.0.13",
    "tls_verify": null,
    "created_at": 1630458681,
    "tls_verify_depth": null,
    "retries": 5,
    "path": null,
    "updated_at": 1630458698,
    "id": "51573882-ac30-4bd5-ab99-5a94ff369584",
    "name": "monitor-grpc",
    "connect_timeout": 60000,
    "client_certificate": null,
    "protocol": "grpc",
    "port": 8882
}
#route:
{
    "next": null,
    "data":
    [
        {
            "headers": null,
            "hosts": null,
            "request_buffering": true,
            "response_buffering": true,
            "service":
            {
                "id": "51573882-ac30-4bd5-ab99-5a94ff369584"
            },
            "snis": null,
            "https_redirect_status_code": 426,
            "preserve_host": false,
            "protocols":
            [
                "http",
                "https"
            ],
            "created_at": 1630468867,
            "updated_at": 1630470535,
            "path_handling": "v1",
            "paths":
            [
                "/",
                "/env_monitor_srv"
            ],
            "name": "grpc-route",
            "sources": null,
            "id": "a5e3dea3-d216-477c-84c1-e7d505228f2d",
            "methods": null,
            "destinations": null,
            "regex_priority": 0,
            "strip_path": true,
            "tags": null
        }
    ]
}
#grpc gateway plugin:
{
    "next": null,
    "data":
    [
        {
            "consumer": null,
            "protocols":
            [
                "grpc",
                "grpcs",
                "http",
                "https"
            ],
            "created_at": 1630459281,
            "tags": null,
            "enabled": true,
            "service":
            {
                "id": "51573882-ac30-4bd5-ab99-5a94ff369584"
            },
            "route": null,
            "id": "65a074cb-eba4-4b86-9e98-c68c9f10e9a0",
            "config":
            {
                "proto": "/usr/local/kong/protoc/kong-grpc.proto" //这个是 容器内地址，docker cp进去的
            },
            "name": "grpc-gateway"
        }
    ]
}

然后我的kong-grpc.proto文件是：

syntax = "proto3";

option go_package = "/env_monitor_srv";

package env_monitor_srv;

service EnvMonitorSrv {
    rpc GetContent(GetContentReqMsg) returns (GetContentRepMsg) {
        option (google.api.http) = {
            get: "/v1/content/{keyname}"
            additional_bindings {
                   get: "/v1/content/test/{keyname}"
              }
            post: "/v1/content/{keyname}"
            body: "*"
        }
    }
    
}


//配置文件请求API
message GetContentReqMsg
{
    string keyname = 1;
}
message EtcdContentBody
{
    string key =1;
    int32 version = 2;
    string update_time = 3;
    string content = 5;
}

//配置文件响应API
message GetContentRepMsg
{
    int32 code = 1;
    string msg = 2;
    EtcdContentBody data = 3;
    
}


//只在文件内容API
message SaveContentReqMsg
{
    string keyname = 1;
    string content = 2;
}
//响应
message SaveContentRepMsg
{
    int32 code = 1;
    string msg = 2;
}

然后我访问网关报failed to transcode .proto file Unknown path "/env_monitor_srv/v1/content/keyname"的错：

$ curl "http://127.0.0.1:8000/env_monitor_srv/v1/content/keyname" -i
HTTP/1.1 400 Bad Request
Date: Wed, 01 Sep 2021 06:07:57 GMT
Connection: keep-alive
Access-Control-Allow-Origin: *
Content-Length: 82
X-Kong-Response-Latency: 2
Server: kong/2.5.0

failed to transcode .proto file Unknown path "/env_monitor_srv/v1/content/keyname"

为啥 ？哪里出问题了？