So I'm developing a backend CGI script that several virtual hosts will need to hit. Depending on which virtual host is accessing the file they will need different settings set ( database names, id's, etc.. ). My question is this, what is the best way to tell what virtual host is accessing the file? I guess I could go by the referer for the CGI object, however I don't know how subdomains (which should not come into play) would effect this for instance: 
http://www.yahoo.com
http://yahoo.com
http://someplace.yahoo.com/blah_blah/index.html

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The above should all return 'yahoo'. After I work this part out I can store the values in a configuration file that just contains a hash for each host I guess. Any ideas, or alternate suggestions are welcome. Thanks in advance.

In reply to Telling different virtual hosts apart by ayapejian

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