Hello all,

we're using a Nginx as proxy gateway to several customer specific apache instances on different servers.

In order to determine where to route the traffic from a Facebook application, we need to extract the page id from the Facebook signed request (http://developers.facebook.com/docs/authentication/signed_request/) and look up its respective target apache instance in a table (probably from memcached).

As I don't have much experience with Nginx yet, I'd like to ask for your feedback on some theoretical solutions I've come up with:

1) Extract the signed request from the POST data with the HttpFormInputModule or HttpLuaModule and use HttpMemcModule for interactions with memcached.

From my understanding, this whole operation could be defined in the nginx.conf or site.conf file then, which is favorable, but I haven't found out yet if I'd be actually be able to decode the signed request for processing. Is there maybe another third party module available for this?

2) Use the EmbeddedPerlModule, which is still in experimental stage as I understand, and write a perl script similar to the php script posted on the Facebook link above to retrieve the required page id value. Then access memcached from within the script or with the HttpMemcModule.

3) Write my own Nginx module.

What would you suggest is the best way to go about this or do you maybe have better solutions?

Thanks,
Ralf