add HTTP_X_FORWARDED_PROTO

[hknochi]

add possibility to get configured https via header-param

description:
https://github.com/AKSW/OntoWiki/wiki/OntoWiki-behind-a-reverseProxy-(with-SSL)

[white-gecko]

This line exceeds 120 characters and is not readable [1]. Please enable the codings standards in our development environment (make cs-install).
Furthermore your change overwrites any $_SERVER['HTTPS'] setting.
Please reorganize the code to an if-statement which correctly includes the preceding line.

[1] https://github.com/AKSW/OntoWiki/wiki/Coding-Standards

[hknochi]

the added line override the preceding line only if $protocol isn't set to https up to this point. After a chack for "http" (no previous settings) this additionally method is checked.

[white-gecko]

Furthermore there is also X-Forwarded-Protocol which seams to be in use for setting the original protocols in proxies.

Could you please also avoid The “?-:” notation?

[1] http://www.micahcarrick.com/using-ssl-behind-reverse-proxy-in-django.html