test_url.py

from kivy.app import App
from kivy.lang import Builder
from kivy.network.urlrequest import UrlRequest


KV = '''
BoxLayout:
    orientation: 'vertical'
    Label:
        id: result

    Button:
        size_hint_y: None
        height: 40
        text: 'press'
        on_release: app.get_info()
'''


class TestApp(App):
    def build(self):
        return Builder.load_string(KV)

    def got_json(self, req, result):
        label = self.root.ids.result
        print(result)
        for key, value in result.items():
            label.text += ('{}: {}'.format(key, value))
            print('{}: {}'.format(key, value))

    def fail(self, *args):
        print(args)

    def get_info(self):
        print("making request")
        self.get_url('http://xkcd.com/614/info.0.json')

    def get_url(self, url):
        self.req = UrlRequest(
            url,
            on_success=self.got_json,
            on_error=self.fail,
            on_failure=self.fail,
            on_progress=self.progress,
            on_redirect=self.follow,
        )

    def progress(self, *args):
        print("beep boop", args)

    def follow(self, req, result):
        self.get_url(req.resp_headers['location'])


if __name__ == '__main__':
    TestApp().run()