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?? ..
?? auth
?? body_proxy.rb(1.3 KB)
?? builder.rb(8.56 KB)
?? cascade.rb(2.25 KB)
?? chunked.rb(3.3 KB)
?? common_logger.rb(3.12 KB)
?? conditional_get.rb(2.99 KB)
?? config.rb(410 B)
?? constants.rb(2.47 KB)
?? content_length.rb(806 B)
?? content_type.rb(695 B)
?? deflater.rb(5.51 KB)
?? directory.rb(6.02 KB)
?? etag.rb(1.87 KB)
?? events.rb(4.8 KB)
?? file.rb(167 B)
?? files.rb(5.66 KB)
?? head.rb(524 B)
?? headers.rb(2.96 KB)
?? lint.rb(36.09 KB)
?? lock.rb(573 B)
?? logger.rb(414 B)
?? media_type.rb(1.4 KB)
?? method_override.rb(1.45 KB)
?? mime.rb(32.69 KB)
?? mock.rb(63 B)
?? mock_request.rb(5.37 KB)
?? mock_response.rb(3.28 KB)
?? multipart
?? multipart.rb(1.17 KB)
?? null_logger.rb(1.18 KB)
?? query_parser.rb(8.37 KB)
?? recursive.rb(1.78 KB)
?? reloader.rb(3.02 KB)
?? request.rb(24.57 KB)
?? response.rb(10.72 KB)
?? rewindable_input.rb(3.12 KB)
?? runtime.rb(870 B)
?? sendfile.rb(5.55 KB)
?? show_exceptions.rb(13.73 KB)
?? show_status.rb(3.58 KB)
?? static.rb(6 KB)
?? tempfile_reaper.rb(778 B)
?? urlmap.rb(2.81 KB)
?? utils.rb(21.1 KB)
?? version.rb(958 B)

Editing: headers.rb

module Rack
  # Rack::Headers is a Hash subclass that downcases all keys.  It's designed
  # to be used by rack applications that don't implement the Rack 3 SPEC
  # (by using non-lowercase response header keys), automatically handling
  # the downcasing of keys.
  class Headers < Hash
    def self.[](*items)
      if items.length % 2 != 0
        if items.length == 1 && items.first.is_a?(Hash)
          new.merge!(items.first)
        else
          raise ArgumentError, "odd number of arguments for Rack::Headers"
        end
      else
        hash = new
        loop do
          break if items.length == 0
          key = items.shift
          value = items.shift
          hash[key] = value
        end
        hash
      end
    end

def [](key)
      super(downcase_key(key))
    end

def []=(key, value)
      super(key.downcase.freeze, value)
    end
    alias store []=

def assoc(key)
      super(downcase_key(key))
    end

def compare_by_identity
      raise TypeError, "Rack::Headers cannot compare by identity, use regular Hash"
    end

def delete(key)
      super(downcase_key(key))
    end

def dig(key, *a)
      super(downcase_key(key), *a)
    end

def fetch(key, *default, &block)
      key = downcase_key(key)
      super
    end

def fetch_values(*a)
      super(*a.map!{|key| downcase_key(key)})
    end

def has_key?(key)
      super(downcase_key(key))
    end
    alias include? has_key?
    alias key? has_key?
    alias member? has_key?

def invert
      hash = self.class.new
      each{|key, value| hash[value] = key}
      hash
    end

def merge(hash, &block)
      dup.merge!(hash, &block)
    end

def reject(&block)
      hash = dup
      hash.reject!(&block)
      hash
    end

def replace(hash)
      clear
      update(hash)
    end

def select(&block)
      hash = dup
      hash.select!(&block)
      hash
    end

def to_proc
      lambda{|x| self[x]}
    end

def transform_values(&block)
      dup.transform_values!(&block)
    end

def update(hash, &block)
      hash.each do |key, value|
        self[key] = if block_given? && include?(key)
          block.call(key, self[key], value)
        else
          value
        end
      end
      self
    end
    alias merge! update

def values_at(*keys)
      keys.map{|key| self[key]}
    end

# :nocov:
    if RUBY_VERSION >= '2.5'
    # :nocov:
      def slice(*a)
        h = self.class.new
        a.each{|k| h[k] = self[k] if has_key?(k)}
        h
      end

def transform_keys(&block)
        dup.transform_keys!(&block)
      end

def transform_keys!
        hash = self.class.new
        each do |k, v|
          hash[yield k] = v
        end
        replace(hash)
      end
    end

# :nocov:
    if RUBY_VERSION >= '3.0'
    # :nocov:
      def except(*a)
        super(*a.map!{|key| downcase_key(key)})
      end
    end

private

def downcase_key(key)
      key.is_a?(String) ? key.downcase : key
    end
  end
end

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