Fix fake tunnel failure

docs/api/Titanium.Web.Proxy.ProxyServer.html

@@ -1178,7 +1178,7 @@ <h5 class="parameters">Parameters</h5>
     <a href="https://github.com/justcoding121/Titanium-Web-Proxy/new/master/apiSpec/new?filename=Titanium_Web_Proxy_ProxyServer_DisableAllSystemProxies.md&amp;value=---%0Auid%3A%20Titanium.Web.Proxy.ProxyServer.DisableAllSystemProxies%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
   </span>
   <span class="small pull-right mobile-hide">
-    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L524">View Source</a>
+    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L526">View Source</a>
   </span>
   <a id="Titanium_Web_Proxy_ProxyServer_DisableAllSystemProxies_" data-uid="Titanium.Web.Proxy.ProxyServer.DisableAllSystemProxies*"></a>
   <h4 id="Titanium_Web_Proxy_ProxyServer_DisableAllSystemProxies" data-uid="Titanium.Web.Proxy.ProxyServer.DisableAllSystemProxies">DisableAllSystemProxies()</h4>
@@ -1194,7 +1194,7 @@ <h5 class="decalaration">Declaration</h5>
     <a href="https://github.com/justcoding121/Titanium-Web-Proxy/new/master/apiSpec/new?filename=Titanium_Web_Proxy_ProxyServer_DisableSystemHttpProxy.md&amp;value=---%0Auid%3A%20Titanium.Web.Proxy.ProxyServer.DisableSystemHttpProxy%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
   </span>
   <span class="small pull-right mobile-hide">
-    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L495">View Source</a>
+    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L496">View Source</a>
   </span>
   <a id="Titanium_Web_Proxy_ProxyServer_DisableSystemHttpProxy_" data-uid="Titanium.Web.Proxy.ProxyServer.DisableSystemHttpProxy*"></a>
   <h4 id="Titanium_Web_Proxy_ProxyServer_DisableSystemHttpProxy" data-uid="Titanium.Web.Proxy.ProxyServer.DisableSystemHttpProxy">DisableSystemHttpProxy()</h4>
@@ -1210,7 +1210,7 @@ <h5 class="decalaration">Declaration</h5>
     <a href="https://github.com/justcoding121/Titanium-Web-Proxy/new/master/apiSpec/new?filename=Titanium_Web_Proxy_ProxyServer_DisableSystemHttpsProxy.md&amp;value=---%0Auid%3A%20Titanium.Web.Proxy.ProxyServer.DisableSystemHttpsProxy%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
   </span>
   <span class="small pull-right mobile-hide">
-    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L503">View Source</a>
+    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L504">View Source</a>
   </span>
   <a id="Titanium_Web_Proxy_ProxyServer_DisableSystemHttpsProxy_" data-uid="Titanium.Web.Proxy.ProxyServer.DisableSystemHttpsProxy*"></a>
   <h4 id="Titanium_Web_Proxy_ProxyServer_DisableSystemHttpsProxy" data-uid="Titanium.Web.Proxy.ProxyServer.DisableSystemHttpsProxy">DisableSystemHttpsProxy()</h4>
@@ -1226,7 +1226,7 @@ <h5 class="decalaration">Declaration</h5>
     <a href="https://github.com/justcoding121/Titanium-Web-Proxy/new/master/apiSpec/new?filename=Titanium_Web_Proxy_ProxyServer_DisableSystemProxy_Titanium_Web_Proxy_Models_ProxyProtocolType_.md&amp;value=---%0Auid%3A%20Titanium.Web.Proxy.ProxyServer.DisableSystemProxy(Titanium.Web.Proxy.Models.ProxyProtocolType)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
   </span>
   <span class="small pull-right mobile-hide">
-    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L511">View Source</a>
+    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L512">View Source</a>
   </span>
   <a id="Titanium_Web_Proxy_ProxyServer_DisableSystemProxy_" data-uid="Titanium.Web.Proxy.ProxyServer.DisableSystemProxy*"></a>
   <h4 id="Titanium_Web_Proxy_ProxyServer_DisableSystemProxy_Titanium_Web_Proxy_Models_ProxyProtocolType_" data-uid="Titanium.Web.Proxy.ProxyServer.DisableSystemProxy(Titanium.Web.Proxy.Models.ProxyProtocolType)">DisableSystemProxy(ProxyProtocolType)</h4>
@@ -1259,7 +1259,7 @@ <h5 class="parameters">Parameters</h5>
     <a href="https://github.com/justcoding121/Titanium-Web-Proxy/new/master/apiSpec/new?filename=Titanium_Web_Proxy_ProxyServer_Dispose.md&amp;value=---%0Auid%3A%20Titanium.Web.Proxy.ProxyServer.Dispose%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
   </span>
   <span class="small pull-right mobile-hide">
-    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L851">View Source</a>
+    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L854">View Source</a>
   </span>
   <a id="Titanium_Web_Proxy_ProxyServer_Dispose_" data-uid="Titanium.Web.Proxy.ProxyServer.Dispose*"></a>
   <h4 id="Titanium_Web_Proxy_ProxyServer_Dispose" data-uid="Titanium.Web.Proxy.ProxyServer.Dispose">Dispose()</h4>
@@ -1418,7 +1418,7 @@ <h5 class="parameters">Parameters</h5>
     <a href="https://github.com/justcoding121/Titanium-Web-Proxy/new/master/apiSpec/new?filename=Titanium_Web_Proxy_ProxyServer_Start.md&amp;value=---%0Auid%3A%20Titanium.Web.Proxy.ProxyServer.Start%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
   </span>
   <span class="small pull-right mobile-hide">
-    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L537">View Source</a>
+    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L540">View Source</a>
   </span>
   <a id="Titanium_Web_Proxy_ProxyServer_Start_" data-uid="Titanium.Web.Proxy.ProxyServer.Start*"></a>
   <h4 id="Titanium_Web_Proxy_ProxyServer_Start" data-uid="Titanium.Web.Proxy.ProxyServer.Start">Start()</h4>
@@ -1434,7 +1434,7 @@ <h5 class="decalaration">Declaration</h5>
     <a href="https://github.com/justcoding121/Titanium-Web-Proxy/new/master/apiSpec/new?filename=Titanium_Web_Proxy_ProxyServer_Stop.md&amp;value=---%0Auid%3A%20Titanium.Web.Proxy.ProxyServer.Stop%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
   </span>
   <span class="small pull-right mobile-hide">
-    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L595">View Source</a>
+    <a href="https://github.com/justcoding121/Titanium-Web-Proxy/blob/master/src/Titanium.Web.Proxy/ProxyServer.cs/#L598">View Source</a>
   </span>
   <a id="Titanium_Web_Proxy_ProxyServer_Stop_" data-uid="Titanium.Web.Proxy.ProxyServer.Stop*"></a>
   <h4 id="Titanium_Web_Proxy_ProxyServer_Stop" data-uid="Titanium.Web.Proxy.ProxyServer.Stop">Stop()</h4>

src/Titanium.Web.Proxy/ExplicitClientHandler.cs

@@ -47,7 +47,7 @@ private async Task handleClient(ExplicitProxyEndPoint endPoint, TcpClientConnect
             {
                 string connectHostname = null;
                 TunnelConnectSessionEventArgs connectArgs = null;
-                
+
 
                 // Client wants to create a secure tcp tunnel (probably its a HTTPS or Websocket request)
                 if (await HttpHelper.IsConnectMethod(clientStream) == 1)
@@ -154,11 +154,17 @@ await clientStreamWriter.WriteResponseAsync(connectArgs.HttpClient.Response,
 
                         if (EnableTcpServerConnectionPrefetch)
                         {
-                            //don't pass cancellation token here
-                            //it could cause floating server connections when client exits
-                            prefetchConnectionTask = tcpConnectionFactory.GetServerConnection(this, connectArgs,
-                                                    isConnect: true, applicationProtocols: null, noCache: false,
-                                                    cancellationToken: CancellationToken.None);
+                            //make sure the host can be resolved before creating the prefetch task
+                            var ipAddresses = await Dns.GetHostAddressesAsync(connectArgs.HttpClient.Request.RequestUri.Host);
+
+                            if (ipAddresses != null && ipAddresses.Length > 0)
+                            {
+                                //don't pass cancellation token here
+                                //it could cause floating server connections when client exits
+                                prefetchConnectionTask = tcpConnectionFactory.GetServerConnection(this, connectArgs,
+                                                        isConnect: true, applicationProtocols: null, noCache: false,
+                                                        cancellationToken: CancellationToken.None);
+                            }
                         }
 
                         X509Certificate2 certificate = null;

src/Titanium.Web.Proxy/Network/CertificateManager.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -149,7 +149,7 @@ public CertificateEngine CertificateEngine
             set
             {
                 // For Mono (or Non-Windows) only Bouncy Castle is supported
-                if (!RunTime.IsWindows || RunTime.IsRunningOnMono)
+                if (!RunTime.IsWindows)
                 {
                     value = CertificateEngine.BouncyCastle;
                 }
@@ -662,7 +662,7 @@ public void TrustRootCertificate(bool machineTrusted = false)
         /// <returns>True if success.</returns>
         public bool TrustRootCertificateAsAdmin(bool machineTrusted = false)
         {
-            if (!RunTime.IsWindows || RunTime.IsRunningOnMono)
+            if (!RunTime.IsWindows)
             {
                 return false;
             }
@@ -805,7 +805,7 @@ public void RemoveTrustedRootCertificate(bool machineTrusted = false)
         /// <returns>Should also remove from machine store?</returns>
         public bool RemoveTrustedRootCertificateAsAdmin(bool machineTrusted = false)
         {
-            if (!RunTime.IsWindows || RunTime.IsRunningOnMono)
+            if (!RunTime.IsWindows)
             {
                 return false;
             }

src/Titanium.Web.Proxy/Network/Tcp/TcpConnectionFactory.cs

@@ -280,7 +280,7 @@ private async Task<TcpServerConnection> createServerConnection(string remoteHost
                 };
 
                 //linux has a bug with socket reuse in .net core.
-                if (proxyServer.ReuseSocket && (RunTime.IsWindows || RunTime.IsRunningOnMono))
+                if (proxyServer.ReuseSocket && RunTime.IsWindows)
                 {
                     tcpClient.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
                 }

src/Titanium.Web.Proxy/ProxyServer.cs

@@ -102,7 +102,7 @@ public ProxyServer(string rootCertificateName, string rootCertificateIssuerName,
 
             ProxyEndPoints = new List<ProxyEndPoint>();
             tcpConnectionFactory = new TcpConnectionFactory(this);
-            if (!RunTime.IsRunningOnMono && RunTime.IsWindows && !RunTime.IsUwpOnWindows)
+            if (RunTime.IsWindows && !RunTime.IsUwpOnWindows)
             {
                 systemProxySettingsManager = new SystemProxyManager();
             }
@@ -417,9 +417,10 @@ public void SetAsSystemHttpsProxy(ExplicitProxyEndPoint endPoint)
         /// <param name="protocolType">The proxy protocol type.</param>
         public void SetAsSystemProxy(ExplicitProxyEndPoint endPoint, ProxyProtocolType protocolType)
         {
-            if (RunTime.IsRunningOnMono)
+            if (!RunTime.IsWindows)
             {
-                throw new Exception("Mono Runtime do not support system proxy settings.");
+                throw new NotSupportedException(@"Setting system proxy settings are only supported in Windows.
+                            Please manually confugure you operating system to use this proxy's port and address.");
             }
 
             validateEndPointAsSystemProxy(endPoint);
@@ -510,9 +511,10 @@ public void DisableSystemHttpsProxy()
         /// </summary>
         public void DisableSystemProxy(ProxyProtocolType protocolType)
         {
-            if (RunTime.IsRunningOnMono)
+            if (!RunTime.IsWindows)
             {
-                throw new Exception("Mono Runtime do not support system proxy settings.");
+                throw new NotSupportedException(@"Setting system proxy settings are only supported in Windows.
+                            Please manually confugure you operating system to use this proxy's port and address.");
             }
 
             systemProxySettingsManager.RemoveProxy(protocolType);
@@ -523,9 +525,10 @@ public void DisableSystemProxy(ProxyProtocolType protocolType)
         /// </summary>
         public void DisableAllSystemProxies()
         {
-            if (RunTime.IsRunningOnMono)
+            if (!RunTime.IsWindows)
             {
-                throw new Exception("Mono Runtime do not support system proxy settings.");
+                throw new NotSupportedException(@"Setting system proxy settings are only supported in Windows.
+                            Please manually confugure you operating system to use this proxy's port and address.");
             }
 
             systemProxySettingsManager.DisableAllProxy();
@@ -599,7 +602,7 @@ public void Stop()
                 throw new Exception("Proxy is not running.");
             }
 
-            if (!RunTime.IsRunningOnMono && RunTime.IsWindows && !RunTime.IsUwpOnWindows)
+            if (RunTime.IsWindows && !RunTime.IsUwpOnWindows)
             {
                 bool setAsSystemProxy = ProxyEndPoints.OfType<ExplicitProxyEndPoint>()
                     .Any(x => x.IsSystemHttpProxy || x.IsSystemHttpsProxy);
@@ -632,7 +635,7 @@ private void listen(ProxyEndPoint endPoint)
             endPoint.Listener = new TcpListener(endPoint.IpAddress, endPoint.Port);
 
             //linux/macOS has a bug with socket reuse in .net core.
-            if (ReuseSocket && (RunTime.IsWindows || RunTime.IsRunningOnMono))
+            if (ReuseSocket && RunTime.IsWindows)
             {
                 endPoint.Listener.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
             }

src/Titanium.Web.Proxy/RequestHandler.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Net.Sockets;
 #if NETCOREAPP2_1
 using System.Net.Security;
 #endif
@@ -27,7 +28,7 @@ namespace Titanium.Web.Proxy
     public partial class ProxyServer
     {
         private bool isWindowsAuthenticationEnabledAndSupported =>
-            EnableWinAuth && RunTime.IsWindows && !RunTime.IsRunningOnMono;
+            EnableWinAuth && RunTime.IsWindows;
 
         /// <summary>
         ///     This is the core request handler method for a particular connection from client.
@@ -188,8 +189,20 @@ await clientStreamWriter.WriteResponseAsync(args.HttpClient.Response,
                             //If prefetch task is available.
                             if (connection == null && prefetchTask != null)
                             {
-                                connection = await prefetchTask;
+                                try
+                                {
+                                    connection = await prefetchTask;
+                                }
+                                catch (SocketException e)
+                                {
+                                    if(e.SocketErrorCode != SocketError.HostNotFound)
+                                    {
+                                        throw;
+                                    }
+                                }
+
                                 prefetchTask = null;
+
                             }
 
                             // create a new connection if cache key changes.

tests/Titanium.Web.Proxy.IntegrationTests/HttpsTests.cs

@@ -33,5 +33,34 @@ public async Task Can_Handle_Https_Request()
             Assert.AreEqual("I am server. I received your greetings.", body);
         }
 
+        [TestMethod]
+        public async Task Can_Handle_Https_Fake_Tunnel_Request()
+        {
+            var testSuite = new TestSuite();
+
+            var server = testSuite.GetServer();
+            server.HandleRequest((context) =>
+            {
+                return context.Response.WriteAsync("I am server. I received your greetings.");
+            });
+
+            var proxy = testSuite.GetProxy();
+            proxy.BeforeRequest += async (sender, e) =>
+            {
+                e.HttpClient.Request.RequestUri = new Uri(server.ListeningHttpUrl);
+                await Task.FromResult(0);
+            };
+
+            var client = testSuite.GetClient(proxy);
+
+            var response = await client.PostAsync(new Uri($"https://{Guid.NewGuid().ToString()}.com"),
+                                        new StringContent("hello server. I am a client."));
+
+            Assert.AreEqual(HttpStatusCode.OK, response.StatusCode);
+            var body = await response.Content.ReadAsStringAsync();
+
+            Assert.AreEqual("I am server. I received your greetings.", body);
+        }
+
     }
 }