所用版本：86.0.241

参考文档：

https://github.com/cefsharp/CefSharp/wiki/General-Usage#response-filtering

    public class CustomResourceRequestHandler : CefSharp.Handler.ResourceRequestHandler
    {
        protected override void OnResourceLoadComplete(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength)
        {
            //哪个url
            Trace.WriteLine(request.Url);
            //对应地址的Headers
            Trace.WriteLine(response.Headers["date"]);
        }
    }
    public class CustomRequestHandler : CefSharp.Handler.RequestHandler
    {
        protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
        {
            return new CustomResourceRequestHandler();
        }
    }

//使用
chromiumWebBrowser1.RequestHandler = new CustomRequestHandler();

这样请求和响应都能拿到了，这种设计还挺新颖。