https://developer.konghq.com/plugins/ai-proxy/examples/sdk-two-routes/#openai-sdk-multi-provider-chat-routing

[mark0725]

Is there an existing issue for this?

• I have searched the existing issues

Kong version ($ kong version)

Kong 3.11

Current Behavior

Report an error when executing the command according to the documentation.
https://developer.konghq.com/plugins/ai-proxy/examples/sdk-two-routes/#openai-sdk-multi-provider-chat-routing

curl -i -X POST http://localhost:8001/plugins/ \
    --header "Accept: application/json" \
    --header "Content-Type: application/json" \
    --data '
    {
      "name": "ai-proxy",
      "config": [
        {
          "route_type": "llm/v1/chat",
          "auth": {
            "header_name": "Authorization",
            "header_value": "'$COHERE_API_KEY'"
          },
          "logging": {
            "log_statistics": true,
            "log_payloads": false
          },
          "model": {
            "provider": "openai",
            "name": "$(uri_captures.model)"
          }
        },
        {
          "route_type": "llm/v1/chat",
          "auth": {
            "header_name": "Authorization",
            "header_value": "'$MISTRAL_API_KEY'"
          },
          "logging": {
            "log_statistics": true,
            "log_payloads": false
          },
          "model": {
            "provider": "mistral",
            "name": "$(uri_captures.model)"
          }
        }
      ]
    }
    '

result: error: {"message":"An unexpected error occurred"}

Expected Behavior

No response

Steps To Reproduce

No response

Anything else?

The AI proxy plugin config does not support arrays. What is the documentation based on?

[fffonion]

@mark0725 Would you share more details please? It would be helpful to share the dump of your plugin configuration and error log.

[mark0725]

@mark0725 Would you share more details please? It would be helpful to share the dump of your plugin configuration and error log.

Report an error when executing the command according to the documentation.
https://developer.konghq.com/plugins/ai-proxy/examples/sdk-two-routes/#openai-sdk-multi-provider-chat-routing

curl -i -X POST http://localhost:8001/plugins/ \
    --header "Accept: application/json" \
    --header "Content-Type: application/json" \
    --data '
    {
      "name": "ai-proxy",
      "config": [
        {
          "route_type": "llm/v1/chat",
          "auth": {
            "header_name": "Authorization",
            "header_value": "'$COHERE_API_KEY'"
          },
          "logging": {
            "log_statistics": true,
            "log_payloads": false
          },
          "model": {
            "provider": "openai",
            "name": "$(uri_captures.model)"
          }
        },
        {
          "route_type": "llm/v1/chat",
          "auth": {
            "header_name": "Authorization",
            "header_value": "'$MISTRAL_API_KEY'"
          },
          "logging": {
            "log_statistics": true,
            "log_payloads": false
          },
          "model": {
            "provider": "mistral",
            "name": "$(uri_captures.model)"
          }
        }
      ]
    }
    '

result: error: {"message":"An unexpected error occurred"}

[chronolaw]

Do we have any error log for this issue?

[mark0725]

Do we have any error log for this issue?

stack traceback:
[C]: in function 'sort'
/usr/local/share/lua/5.1/kong/db/errors.lua:37: in function 'sorted_keys'
/usr/local/share/lua/5.1/kong/db/errors.lua:262: in function 'schema_violation'
/usr/local/share/lua/5.1/kong/db/dao/init.lua:1088: in function 'validation'
/usr/local/share/lua/5.1/kong/db/dao/init.lua:1182: in function 'insert_entity'
/usr/local/share/lua/5.1/kong/api/endpoints.lua:550: in function 'fn'
/usr/local/share/lua/5.1/kong/api/api_helpers.lua:307: in function </usr/local/share/lua/5.1/kong/api/api_helpers.lua:285>

stack traceback:
[C]: in function 'error'
/usr/local/share/lua/5.1/lapis/application.lua:440: in function 'handler'
/usr/local/share/lua/5.1/lapis/application.lua:186: in function 'resolve'
/usr/local/share/lua/5.1/kong/api/api_helpers.lua:517: in function 'handler'
/usr/local/share/lua/5.1/lapis/application.lua:186: in function 'handler'
/usr/local/share/lua/5.1/lapis/application.lua:219: in function </usr/local/share/lua/5.1/lapis/application.lua:215>
[C]: in function 'xpcall'
/usr/local/share/lua/5.1/lapis/application.lua:215: in function 'dispatch'
/usr/local/share/lua/5.1/lapis/nginx.lua:231: in function 'serve'
/usr/local/share/lua/5.1/kong/init.lua:2199: in function 'admin_content'

[Water-Melon]

It seems that we only see the call stack when it failed, but not the actual error message reported by Lua.
@mark0725 Could you check whether there are any other log entries in error.log before or after these call stacks that you haven’t pasted here?

[mark0725]

It seems that we only see the call stack when it failed, but not the actual error message reported by Lua. @mark0725 Could you check whether there are any other log entries in error.log before or after these call stacks that you haven’t pasted here?

2025/09/23 05:27:29 [error] 2629#0: *1313 [lua] api_helpers.lua:544: handle_error(): /usr/local/share/lua/5.1/lapis/application.lua:440: attempt to compare string with number
stack traceback:
        [C]: in function 'sort'
        /usr/local/share/lua/5.1/kong/db/errors.lua:37: in function 'sorted_keys'
        /usr/local/share/lua/5.1/kong/db/errors.lua:262: in function 'schema_violation'
        /usr/local/share/lua/5.1/kong/db/dao/init.lua:1088: in function 'validation'
        /usr/local/share/lua/5.1/kong/db/dao/init.lua:1182: in function 'insert_entity'
        /usr/local/share/lua/5.1/kong/api/endpoints.lua:550: in function 'fn'
        /usr/local/share/lua/5.1/kong/api/api_helpers.lua:307: in function </usr/local/share/lua/5.1/kong/api/api_helpers.lua:285>

stack traceback:
        [C]: in function 'error'
        /usr/local/share/lua/5.1/lapis/application.lua:440: in function 'handler'
        /usr/local/share/lua/5.1/lapis/application.lua:186: in function 'resolve'
        /usr/local/share/lua/5.1/kong/api/api_helpers.lua:517: in function 'handler'
        /usr/local/share/lua/5.1/lapis/application.lua:186: in function 'handler'
        /usr/local/share/lua/5.1/lapis/application.lua:219: in function </usr/local/share/lua/5.1/lapis/application.lua:215>
        [C]: in function 'xpcall'
        /usr/local/share/lua/5.1/lapis/application.lua:215: in function 'dispatch'
        /usr/local/share/lua/5.1/lapis/nginx.lua:231: in function 'serve'
        /usr/local/share/lua/5.1/kong/init.lua:2199: in function 'admin_content'
        content_by_lua(nginx-kong.conf:138):2: in main chunk, client: 172.19.0.1, server: kong_admin, request: "POST /plugins/ HTTP/1.1", host: "localhost:8001"

Install Kong 3.11， execute the curl command as described in the documentation, and this issue will inevitably occur.