ChatOptions.AdditionalProperties not post to http body

[oudi]

Description

               var chatoptions = new ChatOptions()
                {
                    AdditionalProperties = new AdditionalPropertiesDictionary
                    {
                        // extra_body={"chat_template_kwargs": {"enable_thinking": false}}
                        ["chat_template_kwargs"] = new Dictionary<string, object>
                        {
                            ["enable_thinking"] = false
                        }
                    }
                };
                var message = new Microsoft.Extensions.AI.ChatMessage(ChatRole.User, input);
                messages.Add(message);
                await foreach (var item in _chatClient.GetStreamingResponseAsync(messages, chatoptions))

in the http body from fidder, the AdditionalProperties not send to api. I tried GetResponseAsync is the same.

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• [M.E.AI]ChatOptions.AdditionalProperties is not synchronized to OpenAI ChatCompletionOptions._additionalBinaryDataProperties #6912

[aykutkaann]

Hi,
I looked into this and I think the issue might be in the serialization logic where AdditionalProperties are not included in the HTTP request body. I'd like to investigate further — would a PR be welcome for this?