Raymond Yee

@spulec Sorry that I didn't work through your tests before submitting this PR. Let me take a look.

Yes, I'm having problems with using `data` as a dictionary. I'm using the latest version of `requests` (2.18.1). I find that if I switch `data` to `json`, then I have...

This would be a very useful feature. How hard would it be to implement? Something a newbie could easily contribute?

Thanks, @RawKStar77, for posting this issue.

Restarting my browser did solve the "Session is invalid" problem. Thanks @dwhly for your help.

Thank you, @jonathan-s !!