Example41_HttpClientUsage it is invalid

[fanheshe]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:
`
Example41_HttpClientUsage.Run();
Console.Read();

OpenAIClientBase
this.Client = new OpenAIClient(apiKey, options);
`
This will explain that the previously modified httpclient has been overwritten again

No matter how I modify it continues to work

[JadynWong]

I think the BaseAddress may not affect the request. The completed URI path is already included in the constructed HttpRequestMessage.

https://github.com/Azure/azure-sdk-for-net/blob/c6253cc7c7d1d9d9e69a5983b10491b3960ef29a/sdk/openai/Azure.AI.OpenAI/src/Custom/OpenAIClient.cs#L576-L609

[fanheshe]

How can I implement a custom httpclient

[JadynWong]

I guess you want to use some proxy openai services? If so, here are some of my suggestions.

1. Implement your own ITextCompletion or IChatCompletion. Example16_CustomLLM.cs
2. Go to the https://github.com/Azure/azure-sdk-for-net repository to raise this issue and inquire if the Azure team will support these proxy services from OpenAI. If they do support this, I think it should be easy. (It's better)
3. A quick temporary solution with HttpClientHandler

serviceCollection.AddTransient<MyHttpMessageHandler>();
//Registration of a named HttpClient.
serviceCollection.AddHttpClient("test-client")
    .ConfigurePrimaryHttpMessageHandler<MyHttpMessageHandler>();
    
serviceCollection.AddTransient<IKernel>((sp) =>
{
    var factory = sp.GetRequiredService<IHttpClientFactory>();

    var kernel = Kernel.Builder
        .WithOpenAIChatCompletionService("<model-id>", "<api-key>", httpClient: factory.CreateClient("test-client"))
        .Build();

    return kernel;
});
    
private class MyHttpMessageHandler : HttpClientHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        if (request.RequestUri != null && request.RequestUri.Host.Equals("api.openai.com", StringComparison.OrdinalIgnoreCase))
        {
            request.RequestUri = new Uri($"https://openai.yourproxy.com{request.RequestUri.PathAndQuery}");
        }

        return base.SendAsync(request, cancellationToken);
    }
}

[fanheshe]

Thank you very much. It was a success

[UlyssesWu]

2. Go to the https://github.com/Azure/azure-sdk-for-net repository to raise this issue and inquire if the Azure team will support these proxy services from OpenAI. If they do support this, I think it should be easy. (It's better)

This can aslo be done with some Reflection magic😉 like this (pseudocode)

dynamic c = new OpenAIChatCompletion(...); //find a way to get or create this
c.Client._endpoint = new Uri(yourEndpoint);
c.Client._tokenCredential = DelegatedTokenCredential.Create(...);