README

Wow, when did @sinatra allow custom conditions?!

# app running on http://example.com/example get '/foo' do t = %w[text/css text/html application/javascript] request.accept # ['text/html', '*/*'] request.accept? 'text/xml' # true request.preferred_type(t) # 'text/html' request.body # request body sent by the client (see below) request.scheme # "http" request.script_name # "/example" request.path_info # "/foo" request.port # 80 request.request_method # "GET" request.query_string # "" request.content_length # length of request.body request.media_type # media type of request.body request.host # "example.com" request.get? # true (similar methods for other verbs) request.form_data? # false request["SOME_HEADER"] # value of SOME_HEADER header request.referrer # the referrer of the client or '/' request.user_agent # user agent (used by :agent condition) request.cookies # hash of browser cookies request.xhr? # is this an ajax req...

Full article: http://www.sinatrarb.com/intro#Conditions