You backtracked too far and custom page caching

[Tomi Engel <tomi@objectfarm.org>]

Hi all,

seems like we ran into some WOF 3.5 features while implementing our  
caching mechanism. And I am not sure if the following is the only  
side effect of our mechanism.

Since the page is quite complex and its generation takes a  
reasonable amount of time we decided to simply cache the entire HTML  
output and simply dump it on the next request unless the internal  
data did change.

However...we are hearing about strange "you backtracked too far"  
problems without the user ever clicking the back button.

The obvious reason seems to be that since we are presenting the same  
HTML page we are basically reusing an old contextID which after  
30-request will drop out of the page-backtracking-history-array.

I could not find any information about how this backtracking magic  
is working...but I hope that someone at Apple who can read the  
WOApplication code might be able to tell us how it works and if a  
call to savePage: ,whenever we return that cached instance, will  
boost that old contextID and prevent it from dropping out of the  
backtracking list.

Aloha
	Tomi