Is it possible to detect the incoming request's domain name (host) in 
config.ru? I'm trying to use URLMap to map different domains to different 
apps, all running on the same IP. Theoretically, I'm trying to achieve this 
effect:

map 'http://example1.com' do
> run MyApp::Example1
> end

 

 

map 'http://example2.com' do
> run MyApp::Example2
> end



For example, if it was possible to read rack's SERVER_NAME in config.ru, I 
would do something like:

if SERVER_NAME == 'example1.com'
> map '/' do
> run MyApp::Example1
> end
> end