diff --git a/src/Rscript.vb b/src/Rscript.vb
index c4d24b3..98b6359 100644
--- a/src/Rscript.vb
+++ b/src/Rscript.vb
@@ -116,7 +116,7 @@ Public Module RscriptEngine
     ''' </summary>
     ''' <param name="port"></param>
     <ExportAPI("listen")>
-    Public Sub listen(Optional port As Integer = 321)
+    Public Sub listen(Optional port As Integer = 321, Optional vscode_clr As String = Nothing)
         Call New LanguageServer(port).Listen()
     End Sub
 
diff --git a/src/lsp/LanguageServer.vb b/src/lsp/LanguageServer.vb
index 6d9b4af..edd1a96 100644
--- a/src/lsp/LanguageServer.vb
+++ b/src/lsp/LanguageServer.vb
@@ -1,12 +1,32 @@
-Public Class LanguageServer
+Imports System.Reflection
+Imports Flute.Http
+Imports Flute.Http.Core
+Imports Flute.Http.Core.Message
+Imports Flute.Http.FileSystem
+Imports Microsoft.VisualBasic.ApplicationServices
 
+Public Class LanguageServer : Implements IAppHandler
 
+    ReadOnly vscode As FileSystem
+    ReadOnly http As HttpSocket
 
-    Sub New(port As Integer)
+    Sub New(port As Integer, Optional vscode_clr As String = Nothing)
+        If vscode_clr.FileExists(ZERO_Nonexists:=True) Then
+            vscode = New FileSystem(FindResource(Assembly.LoadFrom(vscode_clr.GetFullPath)))
+        End If
 
+        http = New HttpDriver().HttpMethod("get", Me).GetSocket(port)
     End Sub
 
-    Public Sub Listen()
+    Private Shared Function FindResource(asm As Assembly) As IFileSystemEnvironment
+
+    End Function
+
+    Private Sub AppHandler(request As HttpRequest, response As HttpResponse) Implements IAppHandler.AppHandler
 
     End Sub
+
+    Public Sub Listen()
+        Call http.Run()
+    End Sub
 End Class