Cache problem?

[Alexandr Gomoliako]

On 5/25/11, gvim <gvimrc at gmail.com> wrote:
> I'm running a Perl/PSGI CGI::Application app on nginx via proxy_pass to
> Starman. The app logs form fields to a database and retrieves a resultset
> which is served up via Template Toolkit. Running on Apache as a plain
> vanilla CGI without the PSGI layer I can submit the form, press the Back
> button when the resultset is returned and re-hit the submit button, all
> within a second or 2 without any errors. However, with nginx + Starman the
> same app produces a random number of successful responses then returns an
> error page from the app as if there were 1 form field too many. It looks
> like some kind of cached response because even if I remove the module which
> runs this part of the app I still see the same app-generated error page.

It's probably not related to caching whatsoever unless there is a
proxy_cache somewhere in the server block.

> Since both nginx and Starman are returning a HTTP body there are no errors
> in the logs of either daemon to work with.

How about response status?

Anyway, it might be a long shot, but have you tried switching Starman
to a different PSGI server, like Twiggy or Feersum? After all PSGI is
a relatively new thing for perl and not that widely used.