help request: how to proxy http+pb

[snowleopard331]

Description

我想使用http+pb的方式进行请求，但是打开grpc-transcode插件后，无论json/pb都可以请求到，但是返回的始终是json，我的需求是返回pb。请求头中的accept也设置过，但是都没用，以下是我的路由配置：

{
"uri": "/HelloWorld",
"name": "HelloWorld",
"desc": "HelloWorld接口，测试连通性",
"methods": [
"POST"
],
"plugins": {
"elasticsearch-logger": {
"batch_max_size": 1000,
"buffer_duration": 60,
"endpoint_addr": "http://xxxxxxxxxx",
"field": {
"index": "apisixlog"
},
"inactive_timeout": 5,
"max_retry_count": 0,
"name": "elasticsearch-logger",
"retry_delay": 1,
"ssl_verify": true,
"timeout": 10
},
"grpc-transcode": {
"_meta": {
"disable": false
},
"deadline": 0,
"method": "HelloWorld",
"pb_option": [
"enum_as_name",
"int64_as_number",
"no_default_values",
"disable_hooks"
],
"proto_id": "xxxxxxxxxxxx",
"service": "xxxxxxxxxx",
"show_status_in_body": false
},
"jwt-auth": {
"_meta": {
"disable": true
},
"cookie": "jwt",
"header": "authorization",
"hide_credentials": false,
"query": "jwt"
}
},
"upstream": {
"retries": 3,
"timeout": {
"connect": 6,
"send": 6,
"read": 6
},
"type": "chash",
"hash_on": "header",
"key": "USERID",
"scheme": "grpc",
"discovery_type": "nacos",
"discovery_args": {
"group_name": "xxxxxxxxx",
"namespace_id": "xxxxxxxxxxxxx"
},
"pass_host": "pass",
"service_name": "providers:kiwi.domainServer.example::",
"keepalive_pool": {
"idle_timeout": 60,
"requests": 1000,
"size": 320
},
"retry_timeout": 1
},
"status": 1
}

Environment

• APISIX version (run apisix version):3.6.0
• Operating system (run uname -a): Linux localhost.localdomain 4.18.0-513.9.1.el8_9.x86_64 change: added doc of how to load plugin. #1 SMP Wed Nov 29 18:55:19 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
• OpenResty / Nginx version (run openresty -V or nginx -V):
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[kayx23]

grpc-transcode is for transcoding between regular HTTP requests and gRPC, so it is expected that the upstream response is returned in JSON.

It sounds like you are not looking for any transcoding but to have APISIX proxy for your request to gRPC upstream service, is that correct?

[snowleopard331]

grpc-transcode is for transcoding between regular HTTP requests and gRPC, so it is expected that the upstream response is returned in JSON.

It sounds like you are not looking for any transcoding but to have APISIX proxy for your request to gRPC upstream service, is that correct?

At present, I am using APISIX to proxy my upstreams, and the client uses JSON as the HTTP body. Currently, grpc-transcode is enabled, so the client's input and output are both in JSON format. Now the client wants to use protobuf as the input and output, but I don't know how to configure it. I have tried some solutions, but none have been successful; using HTTP+PB requests, the upstream can receive and process them, but APISIX always returns JSON to the client. What I want is a route configuration that can return protobuf. Thanks

[kayx23]

APISIX always returns JSON to the client. What I want is a route configuration that can return protobuf.

I'm not aware if APISIX can do this. @shreemaan-abhishek thoughts?

[shreemaan-abhishek]

no there is no such feature. do you mean to say that upstream returns PB but APISIX modifies it to JSON?

[snowleopard331]

no there is no such feature. do you mean to say that upstream returns PB but APISIX modifies it to JSON?

No. All PB. No JSON. Do you know how to config APISIX route? Send PB and receive PB. Thank you.

[shreemaan-abhishek]

No. All PB. No JSON.

I meant to ask, does the upstream return JSON even when not using APISIX?

[snowleopard331]

No. All PB. No JSON.

I meant to ask, does the upstream return JSON even when not using APISIX?

upstream return pb, protocol is grpc

[shreemaan-abhishek]

@snowleopard331, can you prepare a github gist/repo with a self contained example to reproduce this issue? I will take a look at this when I am free.