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Browser Ajax crossdomain issue - Python twisted reverse proxy to rescue.


It is big day today. It’s first time python came in handy in my day-to-day job ;) Ok, ok, there might have been 5ek other ways to nail that, but it felt so good then need for ‘learn-some-stuff-in-your-spare-time’ emerged.

Brief intro

The colleague of mine is developing html5-mobile application. He wanted to test/troubleshoot it on his Mac while developing (w/o need to perform the whole build->package->deploy to mobile/emulator cycle). So, he started with some simple html page and certain amount of jQuery ajax. The problem occurred immediately: Ajax crossdomain issue. His setup:

  • browser: Safari
  • html url: file://path_to_file.html
  • service url:

It is impossible to understand why, but for some reason I’m considered to be all-knowing-ajax-javascript guy in the company :D (According to Dmitry Baranovskiy I suck. Nevertheless colleague asked for help.

As always, google + stackoverflow pointed out the simplest solution.


As we all (or some) know, Mac already comes with python and ruby. So, I decided the simplest way to go would be some sort of python or ruby reverse-proxy script (other straightforward solution would be apache + mod_proxy).

Stackoverflow pointed me out twisted toolkit. Few minutes spent with twisted-web sample page and the following script has born (PS> as it turned out - Mac already comes with twisted toolkit shipped).

from twisted.internet import reactor
from twisted.web import static, proxy, server

path = "/Users/xxx/yyy/www"  # path to static resources (html, js etc..)
root = static.File(path)     # will be served under '/'

# reverse proxy, served under '/svc'
# -> becomes http://localhost/svc/service1/v1/JsonService
root.putChild('svc', proxy.ReverseProxyResource('', 80, ''))

# the magic
site = server.Site(root)
reactor.listenTCP(8080, site)

Vuala part

Vuala, problem solved. Python you rock!

NB. If you've found typos or errors, please suggest a correction or edit on github.
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