fix for #654

Author: honfika

src/Titanium.Web.Proxy/ExplicitClientHandler.cs

@@ -121,7 +121,6 @@ await clientStream.WriteResponseAsync(connectArgs.HttpClient.Response,
                     bool isClientHello = clientHelloInfo != null;
                     if (clientHelloInfo != null)
                     {
-                        connectRequest.IsHttps = true;
                         connectRequest.TunnelType = TunnelType.Https;
                         connectRequest.ClientHelloInfo = clientHelloInfo;
                     }
@@ -130,6 +129,7 @@ await clientStream.WriteResponseAsync(connectArgs.HttpClient.Response,
 
                     if (decryptSsl && clientHelloInfo != null)
                     {
+                        connectRequest.IsHttps = true; // todo: move this line to the previous "if"
                         clientConnection.SslProtocol = clientHelloInfo.SslProtocol;
 
                         bool http2Supported = false;

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

@@ -432,7 +432,6 @@ private async Task<TcpServerConnection> createServerConnection(string remoteHost
                     {
                         session.TimeLine["HTTPS Established"] = DateTime.Now;
                     }
-
                 }
             }
             catch (IOException ex) when (ex.HResult == unchecked((int)0x80131620) && retry && enabledSslProtocols >= SslProtocols.Tls11)

src/Titanium.Web.Proxy/RequestHandler.cs

@@ -353,7 +353,7 @@ private void prepareRequestHeaders(HeaderCollection requestHeaders)
                 supportedAcceptEncoding.Add("identity");
 
                 requestHeaders.SetOrAddHeaderValue(KnownHeaders.AcceptEncoding,
-                    string.Join(",", supportedAcceptEncoding));
+                    string.Join(", ", supportedAcceptEncoding));
             }
 
             requestHeaders.FixProxyHeaders();