Selenium C# network traffic logging example

NetworkInterception.cs

public async Task LogNetworkRequests(IWebDriver driver)
{
    INetwork interceptor = driver.Manage().Network;
    interceptor.NetworkRequestSent += OnNetworkRequestSent;
    interceptor.NetworkResponseReceived += OnNetworkResponseReceived;
    await interceptor.StartMonitoring();
    driver.Url = "http://the-internet.herokuapp.com/redirect";
    await interceptor.StopMonitoring();
}

private void OnNetworkRequestSent(object sender, NetworkRequestSentEventArgs e)
{
    StringBuilder builder = new StringBuilder();
    builder.AppendFormat("Request {0}", e.RequestId).AppendLine();
    builder.AppendLine("--------------------------------");
    builder.AppendFormat("{0} {1}", e.RequestMethod, e.RequestUrl).AppendLine();
    foreach (KeyValuePair<string, string> header in e.RequestHeaders)
    {
        builder.AppendFormat("{0}: {1}", header.Key, header.Value).AppendLine();
    }
    builder.AppendLine("--------------------------------");
    builder.AppendLine();
    Console.WriteLine(builder.ToString());
}

private void OnNetworkResponseReceived(object sender, NetworkResponseReceivedEventArgs e)
{
    StringBuilder builder = new StringBuilder();
    builder.AppendFormat("Response {0}", e.RequestId).AppendLine();
    builder.AppendLine("--------------------------------");
    builder.AppendFormat("{0} {1}", e.ResponseStatusCode, e.ResponseUrl).AppendLine();
    foreach (KeyValuePair<string, string> header in e.ResponseHeaders)
    {
        builder.AppendFormat("{0}: {1}", header.Key, header.Value).AppendLine();
    }

    if (e.ResponseResourceType == "Document")
    {
       builder.AppendLine(e.ResponseBody);
    }
    else if (e.ResponseResourceType == "Script")
    {
        builder.AppendLine("<JavaScript content>");
    }
    else if (e.ResponseResourceType == "Stylesheet")
    {
        builder.AppendLine("<stylesheet content>");
    }
    else if (e.ResponseResourceType == "Image")
    {
        builder.AppendLine("<image>");
    }
    else
    {
        builder.AppendFormat("Content type: {0}", e.ResponseResourceType).AppendLine();
    }

    builder.AppendLine("--------------------------------");
    Console.WriteLine(builder.ToString());
}

NetworkInterceptor.cs

using Microsoft.VisualStudio.TestTools.UnitTesting;
using OpenQA.Selenium;
// Example from selenium
namespace SeleniumDocs.ChromeDevTools
{
    [TestClass]
    public class NetworkInterceptorTest : BaseChromeTest
    {
        [TestMethod]
        public void InterceptNetworkForAuthentication()
        {
            var handler = new NetworkAuthenticationHandler()
            {
                UriMatcher = _ => true,
                Credentials = new PasswordCredentials("admin", "admin")
            };
            INetwork networkInterceptor = driver.Manage().Network;
            networkInterceptor.AddAuthenticationHandler(handler);
            networkInterceptor.StartMonitoring().Wait();
            driver.Navigate().GoToUrl("https://the-internet.herokuapp.com/basic_auth");
            networkInterceptor.StopMonitoring().Wait();

            Assert.AreEqual("Congratulations! You must have the proper credentials.", driver.FindElement(By.TagName("p")).Text);

        }

        [TestMethod]
        public void InterceptNetworkResponse()
        {
            var handler = new NetworkResponseHandler();
            handler.ResponseMatcher = httpresponse => true;
            handler.ResponseTransformer = http =>
            {
                var response = new HttpResponseData();
                response.StatusCode = 200;
                response.Body = "Creamy, delicious cheese!";
                return response;
            };

            INetwork networkInterceptor = driver.Manage().Network;
            networkInterceptor.AddResponseHandler(handler);
            networkInterceptor.StartMonitoring().Wait();
            driver.Navigate().GoToUrl("http://google.com");
            networkInterceptor.StopMonitoring().Wait();

            Assert.IsTrue(driver.PageSource.Contains("delicious cheese"));
        }

        [TestMethod]
        public void InterceptNetworkRequest()
        {
            var handler = new NetworkRequestHandler();
            handler.RequestMatcher = httprequest => true;
            handler.ResponseSupplier = http =>
                    {
                        var response = new HttpResponseData();
                        response.StatusCode = 200;
                        response.Body = "Creamy, delicious cheese!";
                        return response;
                    };

            INetwork networkInterceptor = driver.Manage().Network;
            networkInterceptor.AddRequestHandler(handler);

            networkInterceptor.StartMonitoring().Wait();
            driver.Navigate().GoToUrl("https://google.com");
            networkInterceptor.StopMonitoring().Wait();

            Assert.IsTrue(driver.PageSource.Contains("delicious cheese"));
        }

    }
}