Possible to read request's host in config.ru?

[armanx]

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

 

[Magnus Holm]

It's already supported, you just need the trailing slash:

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

// Magnus Holm

[Arman]

Thanks for the quick answer. This definitely works.

Our of curiosity, is it possible to see the host and other request information in config.ru?

[Magnus Holm]

No, but this is what middleware are for:

class ApplicationChooser
def initialize(apps)
@apps = apps
end

def call(env)
@apps.each do |proc, app|
return app.call(env) if proc.call(env)
end
end

run ApplicationChooser.new(
proc { |env| env["SERVER_NAME"] == "example.com" } => App1,
proc { |env| env["QUERY_STRING"] == "admin" } => App2,
proc { |env| true } => Default
)

// Magnus Holm

[armanx]

Thank you so much for prompt and useful explanation.