Posting issues with CloudFlare

[DreamPhysix]

I'm running IP.Board 3.4.7 with CloudFlare.  Some users are reporting that since switching to CloudFlare, sometimes when they submit a post, the page refreshes to the same page.  The post gets submitted but they're sent to the page to submit it, so we end up with double posts.  I suspect this is a caching issue, but I'm not sure how to fix it.  I don't want to turn CloudFlare off completely.  Thoughts?

[SteffM]

Does not sound like a caching issue, HTTP redirects are not cached.
 

If you submit a post and the POST action is executed twice, I'd say the user was not patient enough and pressed the button twice
I think this because there is no way a server could force a client to submit a 2nd POST request without using javascript

EDIT:
Also, normal HTTP requests to the server are not cached, only the requests for static files are.

You could do some debugging and check what headers are being provided.
Or use Firefox Tamperdata to go through each request

[Alucard0134]

Normally I would suspect with rockerloader, as it is known to wonk with JS files with IPB which does screw your forum a considerable amount. I usually keep it disabled on mine.