fix 11426: Logout page gets cached

docs/changelog/7.x.x.txt

@@ -7,6 +7,7 @@
  - fixed #11431: Prototypes cache attribute lost
  - fixed #11428: Dataform Date Field Problem
  - fixed #11409: 7.7.32 Breaks Code Editor
+ - fixed #11426: Logout page gets cached
 
 7.8.12
  - fixed #11285: Pasting HTML into Code Editor in IE

lib/WebGUI/Auth.pm

@@ -877,6 +877,9 @@ sub logout {
        my $error = qx($command);
        $self->session->errorHandler->warn($error) if $error;
     }
+
+    # Do not allow caching of the logout page (to ensure the page gets requested)
+    $self->session->http->setCacheControl( "none" );
    
 	return undef;
 }