Use CORS for the proxy

[LanzelotAsp]

Hello,

I am using the proxy as it is described in the README. In a WebGL app which runs on a different domain than the proxy, I get CORS errors, trying to access the API. Is there a way to configure CORS in the proxy? I already tried different things but found no way.

Thank you,
Alex

[StephenHodgson]

sounds like a bit more complicated of a setup with proxy. I'd have to see the exact errors to help troubleshoot. The CORS error is coming form proxy or unity client?

[LanzelotAsp]

The error comes from the client (in the web browser).
Looking further into the issue it seems that it needs changes in openai-dotnet. Probably in OpenAiProxy.CreateWebApplication<T>() there could be added code to setup CORS. Something like this:

        //-- activate CORS (for our local testing)
        builder.Services.AddCors(options =>
        {
            options.AddPolicy("AllowOurSources", policy =>
            {
                policy.WithOrigins("http://localhost:8000", "https://my-test-domain.com") // Allow specific origin
                    .AllowAnyMethod()                   // Allow any HTTP method
                    .AllowAnyHeader();                  // Allow any header
            });
        });        
        
        
        WebApplication app = builder.Build();

        // Use the CORS policy
        app.UseCors("AllowOurSources");

[StephenHodgson]

You could just build it yourself and replace that call with your own version of the following:

OpenAI-DotNet/OpenAI-DotNet-Proxy/Proxy/OpenAIProxy.cs

Lines 87 to 96 in 2e53e8e

	var builder = WebApplication.CreateBuilder(args);
	builder.Logging.ClearProviders();
	builder.Logging.AddConsole();
	builder.Logging.SetMinimumLevel(LogLevel.Debug);
	builder.WebHost.ConfigureKestrel(ConfigureKestrel);
	builder.Services.AddSingleton(openAIClient);
	builder.Services.AddSingleton<IAuthenticationFilter, T>();
	var app = builder.Build();
	var startup = new OpenAIProxy();
	startup.Configure(app, app.Environment);

You don't have to use OpenAiProxy.CreateWebApplication<T>() just make your own builder and add the services yourself

[LanzelotAsp]

I took the single file into my project, renamed the class to OpenAIProxy2 and patched it. That works.
Thanks.

[StephenHodgson]

Probably didn't need to patch it. Like I said you could just create your own builder instance and do most of the same steps in the convenience method. Glad to hear that you got it sorted and working.