web_test.py

import web
import simplejson as json

urls = (
    '/', 'index',
    '/url', 'url',
    '/math', 'math'
)

class index:
    def GET(self):
        return 'hello, world'

class url:
    def GET(self):
        return 'url'

class math:
    def GET(self):
        return 'do math'

    def POST(self):
        data = web.data()
        j = json.loads(data)
        print j
        return j['a']+j['b']

if __name__ == "__main__":
    app = web.application(urls, globals())
    app.run()