Use `empty()` for signed request value check
clarified apache specific lookup for ssl & added ability to look for nginx values for ssl
Merge pull request #45 from favrik/master

Use `empty()` for signed request value check
Merge pull request #50 from evanadelman/master

SSL detection breaks in NGINX
Fixed a vulnerability with signed requests
Merge pull request #57 from kilotaras/vulnerability_bug

Fixed a vulnerability with signed requests