I haven't checked the http headers yet. The tricky thing is that it usually 
works fine even on the production server! It could be that I set the cookie 
in a non-standard way, but the session attribute is that a cookie too (I 
don't know fully how GAE manages sessions)?

On Sunday, August 28, 2011 3:46:10 PM UTC+2, Mike Lawrence wrote:
>
> have you tried viewing the http headers in each request 
> using chrome, firebug, httpwatch, etc? 
> sunshine is the best disinfectant 
>
> I dont think redirects normally can set cookies 
> maybe the prod server is striping your 
> invalid host headers on a redirect 
>
> On Aug 28, 7:32 am, Simon Knott <knott...@gmail.com> wrote: 
> > You're not placing anything in your session which isn't serializable are 
> > you?   
> > 
> > Given that everything seems to be failing when it's starting up a new 
> > instance, which is when it will attempt to read the session out of the 
> > datastore/memcache, it may be that it can't deserialize your data.

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