system proxy do not support non-windows env

Author: justcoding121

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();
             }
@@ -511,9 +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);
@@ -524,9 +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();
@@ -600,7 +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);
@@ -633,7 +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

@@ -27,7 +27,7 @@ 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.