# File lib/rack/utils.rb, line 207
207:     def delete_cookie_header!(header, key, value = {})
208:       case header["Set-Cookie"]
209:       when nil, ''
210:         cookies = []
211:       when String
212:         cookies = header["Set-Cookie"].split("\n")
213:       when Array
214:         cookies = header["Set-Cookie"]
215:       end
216: 
217:       cookies.reject! { |cookie|
218:         if value[:domain]
219:           cookie =~ /\A#{escape(key)}=.*domain=#{value[:domain]}/
220:         else
221:           cookie =~ /\A#{escape(key)}=/
222:         end
223:       }
224: 
225:       header["Set-Cookie"] = cookies.join("\n")
226: 
227:       set_cookie_header!(header, key,
228:                  {:value => '', :path => nil, :domain => nil,
229:                    :expires => Time.at(0) }.merge(value))
230: 
231:       nil
232:     end