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?? auth
?? backports
?? body_proxy.rb(958 B)
?? builder.rb(4.27 KB)
?? cascade.rb(1.34 KB)
?? chunked.rb(1.58 KB)
?? commonlogger.rb(2.28 KB)
?? conditionalget.rb(2.5 KB)
?? config.rb(379 B)
?? content_length.rb(840 B)
?? content_type.rb(670 B)
?? deflater.rb(4.57 KB)
?? directory.rb(4.2 KB)
?? etag.rb(2.11 KB)
?? file.rb(4.09 KB)
?? handler
?? handler.rb(3.25 KB)
?? head.rb(484 B)
?? lint.rb(29.26 KB)
?? lobster.rb(1.97 KB)
?? lock.rb(601 B)
?? logger.rb(357 B)
?? methodoverride.rb(1.01 KB)
?? mime.rb(30.94 KB)
?? mock.rb(5.68 KB)
?? multipart
?? multipart.rb(1.14 KB)
?? nulllogger.rb(951 B)
?? recursive.rb(1.73 KB)
?? reloader.rb(2.97 KB)
?? request.rb(12.59 KB)
?? response.rb(4.33 KB)
?? rewindable_input.rb(3.19 KB)
?? runtime.rb(961 B)
?? sendfile.rb(5.18 KB)
?? server.rb(10.8 KB)
?? session
?? showexceptions.rb(11.7 KB)
?? showstatus.rb(3.46 KB)
?? static.rb(4.88 KB)
?? tempfile_reaper.rb(670 B)
?? urlmap.rb(2.46 KB)
?? utils
?? utils.rb(20.86 KB)

Editing: cascade.rb

module Rack
  # Rack::Cascade tries a request on several apps, and returns the
  # first response that is not 404 or 405 (or in a list of configurable
  # status codes).

class Cascade
    NotFound = [404, {CONTENT_TYPE => "text/plain"}, []]

attr_reader :apps

def initialize(apps, catch=[404, 405])
      @apps = []; @has_app = {}
      apps.each { |app| add app }

@catch = {}
      [*catch].each { |status| @catch[status] = true }
    end

def call(env)
      result = NotFound

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)
        last_body = result[2]
        break unless @catch.include?(result[0].to_i)
      end

result
    end

def add(app)
      @has_app[app] = true
      @apps << app
    end

def include?(app)
      @has_app.include? app
    end

alias_method :<<, :add
  end
end

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Editing: cascade.rb

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