diff --git a/mercurial/hgweb/hgwebdir_mod.py b/mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py
+++ b/mercurial/hgweb/hgwebdir_mod.py
@@ -370,4 +370,7 @@ class hgwebdir(object):
             env['SERVER_NAME'] = u.host
             if u.port:
                 env['SERVER_PORT'] = u.port
-            env['SCRIPT_NAME'] = '/' + u.path
+            path = u.path or ""
+            if not path.startswith('/'):
+                path = '/' + path
+            env['SCRIPT_NAME'] = path
diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -539,12 +539,15 @@ class ui(object):
             except Exception:
                 pass
 
-        # instead of trying to emulate raw_input, swap our in/out
-        # with sys.stdin/out
-        old = sys.stdout, sys.stdin
-        sys.stdout, sys.stdin = self.fout, self.fin
-        line = raw_input(prompt)
-        sys.stdout, sys.stdin = old
+        # call write() so output goes through subclassed implementation
+        # e.g. color extension on Windows
+        self.write(prompt)
+
+        # instead of trying to emulate raw_input, swap self.fin with sys.stdin
+        old = sys.stdin
+        sys.stdin = self.fin
+        line = raw_input()
+        sys.stdin = old
 
         # When stdin is in binary mode on Windows, it can cause
         # raw_input() to emit an extra trailing carriage return