# File lib/rack/utils.rb, line 202
202:     def delete_cookie_header!(header, key, value = {})
203:       case header["Set-Cookie"]
204:       when nil, ''
205:         cookies = []
206:       when String
207:         cookies = header["Set-Cookie"].split("\n")
208:       when Array
209:         cookies = header["Set-Cookie"]
210:       end
211: 
212:       cookies.reject! { |cookie|
213:         if value[:domain]
214:           cookie =~ /\A#{escape(key)}=.*domain=#{value[:domain]}/
215:         else
216:           cookie =~ /\A#{escape(key)}=/
217:         end
218:       }
219: 
220:       header["Set-Cookie"] = cookies.join("\n")
221: 
222:       set_cookie_header!(header, key,
223:                  {:value => '', :path => nil, :domain => nil,
224:                    :expires => Time.at(0) }.merge(value))
225: 
226:       nil
227:     end