Spring AI OpenAI API returns body as empty

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Bug description There is a problem calling my private cloud OpenAI service using OpenAiApi

But using openai4j is normal

Using Postman is also normal

Environment 17 17 17 6.2.4 3.4.3 1.0.0-M6 2024.0.0 Steps to reproduce

    @Test
    public void openaiTest() {
        OpenAiApi openAiApi = OpenAiApi.builder()
                .apiKey("")
                .baseUrl("")
                .completionsPath("chat/completions")
                .build();

        try {
            OpenAiApi.ChatCompletionRequest chatRequest = new OpenAiApi.ChatCompletionRequest(
                    Arrays.asList(new OpenAiApi.ChatCompletionMessage("你是谁", OpenAiApi.ChatCompletionMessage.Role.USER))
                    , "DeepSeek-R1", 0.7, true);
            Flux<OpenAiApi.ChatCompletionChunk> chatCompletionChunkFlux = openAiApi.chatCompletionStream(chatRequest);
            System.out.println(chatCompletionChunkFlux.blockLast());
        } catch (WebClientResponseException e) {
            System.err.println(e.getResponseBodyAsString());

            e.printStackTrace();
        }
    }

<dependency>
            <groupId>dev.ai4j</groupId>
            <artifactId>openai4j</artifactId>
            <version>0.17.0</version>
        </dependency>

    @Test
    public void openaiTest() {
        OpenAiApi openAiApi = OpenAiApi.builder()
                .apiKey("sk-1605216e65cd4f7c85bee30d15f54cf6")
                .baseUrl("http://1.95.200.239:2025/v1/")
                .completionsPath("chat/completions")
                .build();

        try {
            OpenAiApi.ChatCompletionRequest chatRequest = new OpenAiApi.ChatCompletionRequest(
                    Arrays.asList(new OpenAiApi.ChatCompletionMessage("你是谁", OpenAiApi.ChatCompletionMessage.Role.USER))
                    , "DeepSeek-R1", 0.7, true);
            Flux<OpenAiApi.ChatCompletionChunk> chatCompletionChunkFlux = openAiApi.chatCompletionStream(chatRequest);
            System.out.println(chatCompletionChunkFlux.blockLast());
        } catch (WebClientResponseException e) {
            System.err.println(e.getResponseBodyAsString());

            e.printStackTrace();
        }
    }

Expected behavior What problem causes the body to be empty

Minimal Complete Reproducible example Please provide a failing test or a minimal complete verifiable example that reproduces the issue. Bug reports that are reproducible will take priority in resolution over reports that are not reproducible.