module Rack::Utils

def make_delete_cookie_header(header, key, value)
  case header
  when nil, ''
    cookies = []
  when String
    cookies = header.split("\n")
  when Array
    cookies = header
  end
  key = escape(key)
  domain = value[:domain]
  path = value[:path]
  regexp = if domain
             if path
               /\A#{key}=.*(?:domain=#{domain}(?:;|$).*path=#{path}(?:;|$)|path=#{path}(?:;|$).*domain=#{domain}(?:;|$))/
             else
               /\A#{key}=.*domain=#{domain}(?:;|$)/
             end
           elsif path
             /\A#{key}=.*path=#{path}(?:;|$)/
           else
             /\A#{key}=/
           end
  cookies.reject! { |cookie| regexp.match? cookie }
  cookies.join("\n")
end