Looks like one. Maybe you can try encoding the % there. Try replacing
your "%" with "%25"

On Thu, Oct 29, 2009 at 10:16 PM, brianmercer <nginx-forum@nginx.us> wrote:
> I would like to use Nginx to retrieve pages placed in a memcached bin by Drupal caching.
>
> The Drupal key appears to be:
>
>  cache_page-http%3A%2F%2Fexample.com%2Fcontent%2Fquadrum-utinam
>
> Using
>
>    ...
>    set   $memcached_key   cache_page-$scheme://$host$uri;
>    memcached_pass   127.0.0.1:11211;
>    ...
>
> does not produce a match.  I get:
>
>  key: "cache_page-/content/quadrum-utinam" was not found by memcached while reading response header from upstream ...
>
> Is that an encoding problem?
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,18166,18166#msg-18166
>
>
>