Method: Rack::Cascade#call

Defined in:
lib/rack/cascade.rb

#call(env) ⇒ Object

Call each app in order. If the responses uses a status that requires cascading, try the next app. If all responses require cascading, return the response from the last app.



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# File 'lib/rack/cascade.rb', line 32

def call(env)
  return [404, { CONTENT_TYPE => "text/plain" }, []] if @apps.empty?
  result = nil
  last_body = nil

  @apps.each do |app|
    # The SPEC says that the body must be closed after it has been iterated
    # by the server, or if it is replaced by a middleware action. Cascade
    # replaces the body each time a cascade happens. It is assumed that nil
    # does not respond to close, otherwise the previous application body
    # will be closed. The final application body will not be closed, as it
    # will be passed to the server as a result.
    last_body.close if last_body.respond_to? :close

    result = app.call(env)
    return result unless @cascade_for.include?(result[0].to_i)
    last_body = result[2]
  end

  result
end