CherryPy Hello World error

localhost port cherrypy
Alex picture Alex · Apr 20, 2009 · Viewed 13.2k times · Source

When I am running CherryPy Hello World:

import cherrypy

class HelloWorld:
    def index(self):
        return "Hello world!"
    index.exposed = True

cherrypy.config.update({'server.socket_port': 8080,})
cherrypy.quickstart(HelloWorld())

... I get this: IOError: Port 8080 not bound on 'localhost'. What could it be?

Answer

Brandon Rhodes picture Brandon Rhodes · Feb 14, 2012

If you are trying to deploy CherryPy on Heroku, where you cannot use the loopback to check whether you have really opened a port, then you need to simply disable CherryPy's wait_for_occupied_port() function so that CherryPy's self-consistency check does not decide that it has, in fact, failed to start. Here are the three lines that I use to fix CherryPy so that it runs on Heroku:

    from cherrypy.process import servers
    def fake_wait_for_occupied_port(host, port): return
    servers.wait_for_occupied_port = fake_wait_for_occupied_port

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