stackoverflow / 2454494 /

import cherrypy

def multi_headers():
	cherrypy.response.header_list.extend(cherrypy.response.multiheaders) = cherrypy.Tool('on_end_resource', multi_headers)

class Root(object):
	def index(self):
		cherrypy.response.multiheaders = [('foo', '1'), ('foo', '2')]
		return "Hello"

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