diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py
@@ -12,8 +12,10 @@
         '''Create the Visual Studio Code debug adaptor'''
         self.assertTrue(os.path.exists(self.lldbVSCodeExec),
                         'lldb-vscode must exist')
+        log_file_path = self.getBuildArtifact('vscode.txt')
         self.vscode = vscode.DebugAdaptor(
-            executable=self.lldbVSCodeExec, init_commands=self.setUpCommands())
+            executable=self.lldbVSCodeExec, init_commands=self.setUpCommands(),
+            log_file=log_file_path)
 
     def build_and_create_debug_adaptor(self):
         self.build()
@@ -133,7 +135,7 @@
                                     key, key_path, d))
         return value
 
-    def get_stackFrames_and_totalFramesCount(self, threadId=None, startFrame=None, 
+    def get_stackFrames_and_totalFramesCount(self, threadId=None, startFrame=None,
                         levels=None, dump=False):
         response = self.vscode.request_stackTrace(threadId=threadId,
                                                   startFrame=startFrame,
diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
@@ -847,13 +847,17 @@
 
 
 class DebugAdaptor(DebugCommunication):
-    def __init__(self, executable=None, port=None, init_commands=[]):
+    def __init__(self, executable=None, port=None, init_commands=[], log_file=None):
         self.process = None
         if executable is not None:
+            adaptor_env = os.environ.copy()
+            if log_file:
+                adaptor_env['LLDBVSCODE_LOG'] = log_file
             self.process = subprocess.Popen([executable],
                                             stdin=subprocess.PIPE,
                                             stdout=subprocess.PIPE,
-                                            stderr=subprocess.PIPE)
+                                            stderr=subprocess.PIPE,
+                                            env=adaptor_env)
             DebugCommunication.__init__(self, self.process.stdout,
                                         self.process.stdin, init_commands)
         elif port is not None:
diff --git a/lldb/tools/lldb-vscode/VSCode.cpp b/lldb/tools/lldb-vscode/VSCode.cpp
--- a/lldb/tools/lldb-vscode/VSCode.cpp
+++ b/lldb/tools/lldb-vscode/VSCode.cpp
@@ -129,6 +129,12 @@
   if (!input.read_full(log.get(), length, json_str))
     return json_str;
 
+  if (log) {
+    *log << "--> " << std::endl
+         << "Content-Length: " << length << "\r\n\r\n"
+         << json_str << std::endl;
+  }
+
   return json_str;
 }