在aspx页面中支持OPTIONS请求标头

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // 添加CORS策略
        var cors = new EnableCorsAttribute("*", "*", "*");
        config.EnableCors(cors);

        // 其他配置代码
    }
}

public class FilterConfig
{
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        // 添加CORS策略
        var cors = new EnableCorsAttribute("*", "*", "*");
        filters.Add(cors);

        // 其他过滤器配置代码
    }
}

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // 添加CORS策略
        services.AddCors(options =>
        {
            options.AddPolicy("AllowAll",
                builder =>
                {
                    builder.AllowAnyOrigin()
                           .AllowAnyMethod()
                           .AllowAnyHeader();
                });
        });

        // 其他服务配置代码
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        // 使用CORS策略
        app.UseCors("AllowAll");

        // 其他中间件配置代码
    }
}

 <modules>
    <add name="OptionsHttpModule" type="OptionsHttpModule"/>
  </modules>
</system.webServer>

public class OptionsHttpModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        context.BeginRequest += Context_BeginRequest;
    }

    private void Context_BeginRequest(object sender, EventArgs e)
    {
        var context = ((HttpApplication)sender).Context;
        if (context.Request.HttpMethod == "OPTIONS")
        {
            context.Response.StatusCode = 200;
            context.Response.AddHeader("Access-Control-Allow-Origin", "*");
            context.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
            context.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept, Authorization");
            context.Response.AddHeader("Access-Control-Max-Age", "1728000");
            context.Response.End();
        }
    }

    public void Dispose()
    {
    }
}