Apache vhost configuration: set applicationID dynamically

[Peter Schober]

* Philipp, Daniel <Daniel.Philipp at tds.fujitsu.com> [2013-10-02 16:47]:
> 	# default application id
> 	SetEnv MYAPPID appid1
> 	# some referrers
> 	SetEnvIf Referer "^https://example2\.com/" MYAPPID=appid2
> 	SetEnvIf Referer "^https://example3\.com/" MYAPPID=appid3
> 	SetEnvIf Referer "^https://example4\.com/" MYAPPID=appid4
> 	SetEnvIf Referer "^https://example5\.com/" MYAPPID=appid5

As the "referer" (sic) header is not reliable (some user agents may
not return it at all) is this all a "best effort" attempt to avoid IdP
discovery? Then you could process the referrer in your own code and
hit the SP's session initiator with an entityID (which you map from
referres, manually).
-peter