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How to use NetworkConditions class of PuppeteerSharp package

Best Puppeteer-sharp code snippet using PuppeteerSharp.NetworkConditions

Page.cs

Source:Page.cs

...584        /// <returns>Result task</returns>585        /// <remarks>586        /// **NOTE** This does not affect WebSockets and WebRTC PeerConnections (see https://crbug.com/563644)587        /// </remarks>588        public Task EmulateNetworkConditionsAsync(NetworkConditions networkConditions) => FrameManager.NetworkManager.EmulateNetworkConditionsAsync(networkConditions);589        /// <summary>590        /// Returns the page's cookies591        /// </summary>592        /// <param name="urls">Url's to return cookies for</param>593        /// <returns>Array of cookies</returns>594        /// <remarks>595        /// If no URLs are specified, this method returns cookies for the current page URL.596        /// If URLs are specified, only cookies for those URLs are returned.597        /// </remarks>598        public async Task<CookieParam[]> GetCookiesAsync(params string[] urls)599            => (await Client.SendAsync<NetworkGetCookiesResponse>("Network.getCookies", new NetworkGetCookiesRequest600            {601                Urls = urls.Length > 0 ? urls : new string[] { Url }602            }).ConfigureAwait(false)).Cookies;...

NetworkManager.cs

Source:NetworkManager.cs

...13        private readonly CDPSession _client;14        private readonly ILogger _logger;15        private readonly ConcurrentSet<string> _attemptedAuthentications = new();16        private readonly bool _ignoreHTTPSErrors;17        private readonly InternalNetworkConditions _emulatedNetworkConditions = new()18        {19            Offline = false,20            Upload = -1,21            Download = -1,22            Latency = 0,23        };24        private readonly NetworkEventManager _networkEventManager = new();25        private Dictionary<string, string> _extraHTTPHeaders;26        private Credentials _credentials;27        private bool _userRequestInterceptionEnabled;28        private bool _userCacheDisabled;29        private bool _protocolRequestInterceptionEnabled;30        internal NetworkManager(CDPSession client, bool ignoreHTTPSErrors, FrameManager frameManager)31        {32            FrameManager = frameManager;33            _client = client;34            _ignoreHTTPSErrors = ignoreHTTPSErrors;35            _client.MessageReceived += Client_MessageReceived;36            _logger = _client.Connection.LoggerFactory.CreateLogger<NetworkManager>();37        }38        internal event EventHandler<ResponseCreatedEventArgs> Response;39        internal event EventHandler<RequestEventArgs> Request;40        internal event EventHandler<RequestEventArgs> RequestFinished;41        internal event EventHandler<RequestEventArgs> RequestFailed;42        internal event EventHandler<RequestEventArgs> RequestServedFromCache;43        internal Dictionary<string, string> ExtraHTTPHeaders => _extraHTTPHeaders?.Clone();44        internal FrameManager FrameManager { get; set; }45        internal int NumRequestsInProgress => _networkEventManager.NumRequestsInProgress;46        internal async Task InitializeAsync()47        {48            await _client.SendAsync("Network.enable").ConfigureAwait(false);49            if (_ignoreHTTPSErrors)50            {51                await _client.SendAsync("Security.setIgnoreCertificateErrors", new SecuritySetIgnoreCertificateErrorsRequest52                {53                    Ignore = true54                }).ConfigureAwait(false);55            }56        }57        internal Task AuthenticateAsync(Credentials credentials)58        {59            _credentials = credentials;60            return UpdateProtocolRequestInterceptionAsync();61        }62        internal Task SetExtraHTTPHeadersAsync(Dictionary<string, string> extraHTTPHeaders)63        {64            _extraHTTPHeaders = new Dictionary<string, string>();65            foreach (var item in extraHTTPHeaders)66            {67                _extraHTTPHeaders[item.Key.ToLower(CultureInfo.CurrentCulture)] = item.Value;68            }69            return _client.SendAsync("Network.setExtraHTTPHeaders", new NetworkSetExtraHTTPHeadersRequest70            {71                Headers = _extraHTTPHeaders72            });73        }74        internal async Task SetOfflineModeAsync(bool value)75        {76            _emulatedNetworkConditions.Offline = value;77            await UpdateNetworkConditionsAsync().ConfigureAwait(false);78        }79        internal async Task EmulateNetworkConditionsAsync(NetworkConditions networkConditions)80        {81            _emulatedNetworkConditions.Upload = networkConditions?.Upload ?? -1;82            _emulatedNetworkConditions.Download = networkConditions?.Download ?? -1;83            _emulatedNetworkConditions.Latency = networkConditions?.Latency ?? 0;84            await UpdateNetworkConditionsAsync().ConfigureAwait(false);85        }86        private Task UpdateNetworkConditionsAsync()87            => _client.SendAsync("Network.emulateNetworkConditions", new NetworkEmulateNetworkConditionsRequest88            {89                Offline = _emulatedNetworkConditions.Offline,90                Latency = _emulatedNetworkConditions.Latency,91                UploadThroughput = _emulatedNetworkConditions.Upload,92                DownloadThroughput = _emulatedNetworkConditions.Download,93            });94        internal Task SetUserAgentAsync(string userAgent)95            => _client.SendAsync("Network.setUserAgentOverride", new NetworkSetUserAgentOverrideRequest96            {97                UserAgent = userAgent98            });99        internal Task SetCacheEnabledAsync(bool enabled)100        {101            _userCacheDisabled = !enabled;102            return UpdateProtocolCacheDisabledAsync();103        }104        internal Task SetRequestInterceptionAsync(bool value)105        {106            _userRequestInterceptionEnabled = value;...

Puppeteer.cs

Source:Puppeteer.cs

...39        /// </code>40        /// </example>41        public static IReadOnlyDictionary<DeviceDescriptorName, DeviceDescriptor> Devices => DeviceDescriptors.ToReadOnly();42        /// <summary>43        /// Returns a list of network conditions to be used with <seealso cref="Page.EmulateNetworkConditionsAsync(NetworkConditions)"/>.44        /// Actual list of conditions can be found in <seealso cref="PredefinedNetworkConditions.Conditions"/>.45        /// </summary>46        /// <example>47        /// <code>48        ///<![CDATA[49        /// var slow3G = Puppeteer.NetworkConditions["Slow 3G"];50        /// using(var page = await browser.NewPageAsync())51        /// {52        ///     await page.EmulateNetworkConditionsAsync(slow3G);53        ///     await page.goto('https://www.google.com');54        /// }55        /// ]]>56        /// </code>57        /// </example>58        public static IReadOnlyDictionary<string, NetworkConditions> NetworkConditions => PredefinedNetworkConditions.ToReadOnly();59        /// <summary>60        /// Returns an array of argument based on the options provided and the platform where the library is running61        /// </summary>62        /// <returns>Chromium arguments.</returns>63        /// <param name="options">Options.</param>64        public static string[] GetDefaultArgs(LaunchOptions options = null)65            => (options?.Product ?? Product.Chrome) == Product.Chrome66                ? ChromiumLauncher.GetDefaultArgs(options ?? new LaunchOptions())67                : FirefoxLauncher.GetDefaultArgs(options ?? new LaunchOptions());68        /// <summary>69        /// The method launches a browser instance with given arguments. The browser will be closed when the Browser is disposed.70        /// </summary>71        /// <param name="options">Options for launching Chrome</param>72        /// <param name="loggerFactory">The logger factory</param>...

PageEmulateNetworkConditionsTests.cs

Source:PageEmulateNetworkConditionsTests.cs

...5using Xunit.Abstractions;6namespace PuppeteerSharp.Tests.EmulationTests7{8    [Collection(TestConstants.TestFixtureCollectionName)]9    public class PageEmulateNetworkConditionsTests : PuppeteerPageBaseTest10    {11        public PageEmulateNetworkConditionsTests(ITestOutputHelper output) : base(output)12        {13        }14        [PuppeteerTest("emulation.spec.ts", "Page.emulateNetworkConditions", "should change navigator.connection.effectiveType")]15        [SkipBrowserFact(skipFirefox: true)]16        public async Task ShouldChangeNavigatorConnectionEffectiveType()17        {18            var slow3G = Puppeteer.NetworkConditions[NetworkConditions.Slow3G];19            var fast3G = Puppeteer.NetworkConditions[NetworkConditions.Fast3G];20            Assert.Equal("4g", await Page.EvaluateExpressionAsync<string>("window.navigator.connection.effectiveType").ConfigureAwait(false));21            await Page.EmulateNetworkConditionsAsync(fast3G);22            Assert.Equal("3g", await Page.EvaluateExpressionAsync<string>("window.navigator.connection.effectiveType").ConfigureAwait(false));23            await Page.EmulateNetworkConditionsAsync(slow3G);24            Assert.Equal("2g", await Page.EvaluateExpressionAsync<string>("window.navigator.connection.effectiveType").ConfigureAwait(false));25            await Page.EmulateNetworkConditionsAsync(null);26        }27    }28}...

PredefinedNetworkConditions.cs

Source:PredefinedNetworkConditions.cs

...5{6    /// <summary>7    /// Predefined network conditions.8    /// </summary>9    public static class PredefinedNetworkConditions10    {11        private static readonly Dictionary<string, NetworkConditions> Conditions = new Dictionary<string, NetworkConditions>12        {13            [NetworkConditions.Slow3G] = new NetworkConditions14            {15                Download = ((500 * 1000) / 8) * 0.8,16                Upload = ((500 * 1000) / 8) * 0.8,17                Latency = 400 * 5,18            },19            [NetworkConditions.Fast3G] = new NetworkConditions20            {21                Download = ((1.6 * 1000 * 1000) / 8) * 0.9,22                Upload = ((750 * 1000) / 8) * 0.9,23                Latency = 150 * 3.75,24            },25        };26        private static Lazy<IReadOnlyDictionary<string, NetworkConditions>> _readOnlyConditions =27            new Lazy<IReadOnlyDictionary<string, NetworkConditions>>(() => new ReadOnlyDictionary<string, NetworkConditions>(Conditions));28        internal static IReadOnlyDictionary<string, NetworkConditions> ToReadOnly() => _readOnlyConditions.Value;29    }30}...

NetworkConditions.cs

Source:NetworkConditions.cs

1namespace PuppeteerSharp2{3    /// <summary>4    /// Options to be used in <see cref="Page.EmulateNetworkConditionsAsync(NetworkConditions)"/>5    /// </summary>6    public class NetworkConditions7    {8        /// <summary>9        /// Key to be used with <see cref="Puppeteer.NetworkConditions()"/>10        /// </summary>11        public const string Slow3G = "Slow 3G";12        /// <summary>13        /// Key to be used with <see cref="Puppeteer.NetworkConditions()"/>14        /// </summary>15        public const string Fast3G = "Fast 3G";16        /// <summary>17        /// Download speed (bytes/s), `-1` to disable18        /// </summary>19        public double Download { get; set; } = -1;20        /// <summary>21        /// Upload speed (bytes/s), `-1` to disable22        /// </summary>23        public double Upload { get; set; } = -1;24        /// <summary>25        /// Latency (ms), `0` to disable26        /// </summary>27        public double Latency { get; set; } = 0;...

InternalNetworkConditions.cs

Source:InternalNetworkConditions.cs

1namespace PuppeteerSharp2{3    internal class InternalNetworkConditions : NetworkConditions4    {5        public bool Offline { get; set; }6    }7}...

NetworkConditions

Using AI Code Generation

1using PuppeteerSharp;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);9            var browser = await Puppeteer.LaunchAsync(new LaunchOptions10            {11            });12            var page = await browser.NewPageAsync();13            await page.SetRequestInterceptionAsync(true);14            page.Request += async (sender, e) =>15            {16                var request = e.Request;17                if (request.ResourceType == ResourceType.Image)18                {19                    await request.AbortAsync();20                }21                {22                    await request.ContinueAsync();23                }24            };25            await page.EvaluateFunctionAsync("() => alert('yo!')");26            await page.WaitForSelectorAsync("img");27            await page.WaitForSelectorAsync("img");28            await page.WaitForSelectorAsync("img");29            await page.WaitForSelectorAsync("img");30            await page.WaitForSelectorAsync("img");31            await page.WaitForSelectorAsync("img");32            await page.WaitForSelectorAsync("img");33            await page.WaitForSelectorAsync("img");34            await page.WaitForSelectorAsync("img");35            await page.WaitForSelectorAsync("img");36            await page.WaitForSelectorAsync("img");37            await page.WaitForSelectorAsync("img");38            await page.WaitForSelectorAsync("img");39            await page.WaitForSelectorAsync("img");

NetworkConditions

Using AI Code Generation

1using PuppeteerSharp;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            {9                Args = new string[] { "--start-maximized" }10            };11            using (var browser = await Puppeteer.LaunchAsync(options))12            {13                using (var page = await browser.NewPageAsync())14                {15                    {16                    };17                    await page.SetRequestInterceptionAsync(true);18                    page.Request += async (sender, e) =>19                    {20                        await e.Request.ContinueAsync(networkConditions);21                    };22                }23            }24        }25    }26}

NetworkConditions

Using AI Code Generation

1using PuppeteerSharp;2var browserFetcher = new BrowserFetcher();3await browserFetcher.DownloadAsync(BrowserFetcher.DefaultRevision);4var browser = await Puppeteer.LaunchAsync(new LaunchOptions5{6    Args = new string[] { "--no-sandbox" }7});8var page = await browser.NewPageAsync();9await page.SetRequestInterceptionAsync(true);10page.Request += async (sender, e) => await page.SetExtraHTTPHeadersAsync(new Dictionary<string, string>11{12    { "Accept-Language", "en-US,en;q=0.5" }13});14await page.SetOfflineModeAsync(true);15await page.SetGeolocationAsync(new Geolocation16{17});18var client = await page.Target.CreateCDPSessionAsync();19await client.SendAsync("Network.enable");20await client.SendAsync("Network.emulateNetworkConditions", new21{22});23await page.SetOfflineModeAsync(false);24await page.SetGeolocationAsync(new Geolocation25{26});27await page.CloseAsync();28await browser.CloseAsync();29using PuppeteerSharp;30var browserFetcher = new BrowserFetcher();31await browserFetcher.DownloadAsync(BrowserFetcher.DefaultRevision);32var browser = await Puppeteer.LaunchAsync(new LaunchOptions33{34    Args = new string[] { "--no-sandbox" }35});36var page = await browser.NewPageAsync();37await page.SetRequestInterceptionAsync(true);38page.Request += async (sender, e) => await page.SetExtraHTTPHeadersAsync(new Dictionary<string, string>39{40    { "Accept-Language", "en-US,en;q=0.5" }41});42await page.SetOfflineModeAsync(true);43await page.SetGeolocationAsync(new Geolocation44{

NetworkConditions

Using AI Code Generation

1using PuppeteerSharp;2using System.Threading.Tasks;3using System;4{5    {6        static async Task Main(string[] args)7        {8            Console.WriteLine("Hello World!");9            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);10            var browser = await Puppeteer.LaunchAsync(new LaunchOptions11            {12                Args = new string[] { "--no-sandbox" }13            });14            var page = await browser.NewPageAsync();15            await page.SetRequestInterceptionAsync(true);16            await page.SetOfflineModeAsync(true);17            Console.WriteLine("Done");18        }19    }20}21using PuppeteerSharp;22using System.Threading.Tasks;23using System;24{25    {26        static async Task Main(string[] args)27        {28            Console.WriteLine("Hello World!");29            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);30            var browser = await Puppeteer.LaunchAsync(new LaunchOptions31            {32                Args = new string[] { "--no-sandbox" }33            });34            var page = await browser.NewPageAsync();35            await page.SetRequestInterceptionAsync(true);36            await page.SetOfflineModeAsync(true);37            Console.WriteLine("Done");38        }39    }40}41using PuppeteerSharp;42using System.Threading.Tasks;43using System;44{45    {46        static async Task Main(string[] args)47        {48            Console.WriteLine("Hello World!");49            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);50            var browser = await Puppeteer.LaunchAsync(new LaunchOptions51            {52                Args = new string[] { "--no-sandbox" }53            });54            var page = await browser.NewPageAsync();55            await page.SetRequestInterceptionAsync(true);56            await page.SetOfflineModeAsync(true);57            Console.WriteLine("Done");58        }59    }60}

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