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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(3.24 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(972 B)
?? mime.rb(30.89 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(12.45 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(4.87 KB)
?? tempfile_reaper.rb(670 B)
?? urlmap.rb(2.46 KB)
?? utils
?? utils.rb(20.55 KB)

Editing: etag.rb

require 'digest/md5'

module Rack
  # Automatically sets the ETag header on all String bodies.
  #
  # The ETag header is skipped if ETag or Last-Modified headers are sent or if
  # a sendfile body (body.responds_to :to_path) is given (since such cases
  # should be handled by apache/nginx).
  #
  # On initialization, you can pass two parameters: a Cache-Control directive
  # used when Etag is absent and a directive when it is present. The first
  # defaults to nil, while the second defaults to "max-age=0, private, must-revalidate"
  class ETag
    ETAG_STRING = 'ETag'.freeze
    DEFAULT_CACHE_CONTROL = "max-age=0, private, must-revalidate".freeze

def initialize(app, no_cache_control = nil, cache_control = DEFAULT_CACHE_CONTROL)
      @app = app
      @cache_control = cache_control
      @no_cache_control = no_cache_control
    end

def call(env)
      status, headers, body = @app.call(env)

if etag_status?(status) && etag_body?(body) && !skip_caching?(headers)
        original_body = body
        digest, new_body = digest_body(body)
        body = Rack::BodyProxy.new(new_body) do
          original_body.close if original_body.respond_to?(:close)
        end
        headers[ETAG_STRING] = %(W/"#{digest}") if digest
      end

unless headers[CACHE_CONTROL]
        if digest
          headers[CACHE_CONTROL] = @cache_control if @cache_control
        else
          headers[CACHE_CONTROL] = @no_cache_control if @no_cache_control
        end
      end

[status, headers, body]
    end

private

def etag_status?(status)
        status == 200 || status == 201
      end

def etag_body?(body)
        !body.respond_to?(:to_path)
      end

def skip_caching?(headers)
        (headers[CACHE_CONTROL] && headers[CACHE_CONTROL].include?('no-cache')) ||
          headers.key?(ETAG_STRING) || headers.key?('Last-Modified')
      end

def digest_body(body)
        parts = []
        digest = nil

body.each do |part|
          parts << part
          (digest ||= Digest::MD5.new) << part unless part.empty?
        end

[digest && digest.hexdigest, parts]
      end
  end
end

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Editing: etag.rb

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