Adding middleware

var builder = FunctionsApplication.CreateBuilder(args);

builder.Services.AddAuthentication().AddBearerToken();
builder.Services.AddAuthorization();
builder.Services.Configure<KestrelServerOptions>(options =>
{
    options.AllowSynchronousIO = true;
});
builder.Services.AddServerlessHub<Functions>();
builder.Build().Run();

public class QueryStringAuthenticationMiddleware
{
    private readonly RequestDelegate _next;

    public QueryStringAuthenticationMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        if (context.Request.Headers["Authorization"].Count == 0)
        {
            var token = context.Request.Query["auth_token"];
            if (!string.IsNullOrEmpty(token))
            {
                context.Request.Headers["Authorization"] = $"Bearer {token}";
            }
        }

        await _next(context);
    }
}