Chapter 7: include how to ensure requests are HTTPS

[mrthan]

We have config.force_ssl = true across all envs and while migrating to request specs everything was getting HTTP 301/307s. I finally realised the specs were making HTTP requests, not HTTPS and with a bunch more digging we summarised our experience/fix here:

https://stackoverflow.com/questions/6785261/test-an-https-ssl-request-in-rspec-rails/62552995#62552995

Some mention of how to ensure HTTPS requests are used in the specs would be great. There was very little information anywhere on this topic. And if one needs to use _url rather than _path helpers would strengthen this very useful chapter.

Thanks for your work on this book regardless, it's been invaluable.