optional_slash.diff

diff --git a/lib/Mojolicious/Routes/Pattern.pm b/lib/Mojolicious/Routes/Pattern.
index d93029f..9eb4037 100644
--- a/lib/Mojolicious/Routes/Pattern.pm
+++ b/lib/Mojolicious/Routes/Pattern.pm
@@ -85,7 +85,6 @@ sub render {
   }
 
   # Format can be optional
-  $str ||= '/';
   return $render && $format ? "$str.$format" : $str;
 }
 
diff --git a/lib/Mojolicious/Routes/Route.pm b/lib/Mojolicious/Routes/Route.pm
index 0357c4d..7d7ea75 100644
--- a/lib/Mojolicious/Routes/Route.pm
+++ b/lib/Mojolicious/Routes/Route.pm
@@ -130,7 +130,7 @@ sub render {
   }
 
   # Let parent render
-  return $path || '/' unless my $parent = $self->parent;
+  return $path =~ m!^/! ? $path : "/$path" unless my $parent = $self->parent;
   return $parent->render($path, $values);
 }
 
diff --git a/t/mojolicious/pattern.t b/t/mojolicious/pattern.t
index 158a48e..1718218 100644
--- a/t/mojolicious/pattern.t
+++ b/t/mojolicious/pattern.t
@@ -65,7 +65,7 @@ is $pattern->pattern, undef, 'slash has been optimized away';
 $pattern->defaults({action => 'index'});
 ok !$pattern->match('/test/foo/bar'), 'no result';
 is_deeply $pattern->match('/'), {action => 'index'}, 'right structure';
-is $pattern->render, '/', 'right result';
+is $pattern->render, '', 'right result';
 
 # Regex in pattern
 $pattern = Mojolicious::Routes::Pattern->new('/test/(controller)/:action/(id)',
@@ -253,7 +253,7 @@ is $pattern->render($result, 1), '/foo/bar', 'right result';
 $pattern = Mojolicious::Routes::Pattern->new('//');
 $result = $pattern->match('/', 1);
 is_deeply $result, {}, 'right structure';
-is $pattern->render($result, 1), '/', 'right result';
+is $pattern->render($result, 1), '', 'right result';
 $pattern = Mojolicious::Routes::Pattern->new('0');
 $result = $pattern->match('/0', 1);
 is_deeply $result, {}, 'right structure';