optimize: add const string

Author: Wi1l-B0t

src/Plugins/SignClient/Settings.cs

@@ -78,14 +78,16 @@ public static Settings Default
         {
             if (EndpointType != EndpointVsock) return null;
 
+            const string httpScheme = "http://";
+            const string httpsScheme = "https://";
             var endpoint = Endpoint;
-            if (Endpoint.StartsWith("http://"))
+            if (endpoint.StartsWith(httpScheme))
             {
-                endpoint = endpoint.Substring("http://".Length);
+                endpoint = endpoint.Substring(httpScheme.Length);
             }
-            else if (Endpoint.StartsWith("https://"))
+            else if (endpoint.StartsWith(httpsScheme))
             {
-                endpoint = endpoint.Substring("https://".Length);
+                endpoint = endpoint.Substring(httpsScheme.Length);
             }
 
             var parts = endpoint.Split(':', 2);

src/Plugins/SignClient/Vsock.cs

@@ -40,15 +40,15 @@ public Vsock(VsockAddress address)
             _endpoint = new VSockEndPoint(address.ContextId, address.Port);
         }
 
-        internal async ValueTask<Stream> ConnectAsync(SocketsHttpConnectionContext context, CancellationToken cancellationToken)
+        internal async ValueTask<Stream> ConnectAsync(SocketsHttpConnectionContext context, CancellationToken cancellation)
         {
             if (!OperatingSystem.IsLinux()) throw new PlatformNotSupportedException("Vsock is only supported on Linux.");
 
             var socket = VSock.Create(SocketType.Stream);
             try
             {
                 // Have to use `Task.Run` with `Connect` to avoid some compatibility issues(if use ConnectAsync).
-                await Task.Run(() => socket.Connect(_endpoint), cancellationToken);
+                await Task.Run(() => socket.Connect(_endpoint), cancellation);
                 return new NetworkStream(socket, true);
             }
             catch