Add a unit test for ERR_UNEXPECTED_SERVER_AUTH....

net/tools/testserver/testserver.py

Index: net/tools/testserver/testserver.py
===================================================================
--- net/tools/testserver/testserver.py	(revision 9641)
+++ net/tools/testserver/testserver.py	(working copy)
@@ -77,6 +77,7 @@
   def __init__(self, request, client_address, socket_server):
     self._connect_handlers = [
       self.RedirectConnectHandler,
+      self.ServerAuthConnectHandler,
       self.DefaultConnectResponseHandler]
     self._get_handlers = [
       self.KillHandler,
@@ -912,7 +913,22 @@
     self.end_headers()
     return True
 
+  def ServerAuthConnectHandler(self):
+    """Sends a 401 to the CONNECT request for www.server-auth.com. This
+    response doesn't make sense because the proxy server cannot request
+    server authentication."""
 
+    if (self.path.find("www.server-auth.com") < 0):
+      return False
+
+    challenge = 'Basic realm="WallyWorld"'
+
+    self.send_response(401)  # unauthorized
+    self.send_header('WWW-Authenticate', challenge)
+    self.send_header('Connection', 'close')
+    self.end_headers()
+    return True
+
   def DefaultConnectResponseHandler(self):
     """This is the catch-all response handler for CONNECT requests that aren't
     handled by one of the special handlers above.  Real Web servers respond