v15 - URLLIB/URLLIB2 urlopen does not work in RpiGPIO event detect callback

Code:
#Python

#running on kodi over openelec

def play(button):

    #it has the same pid that is printed in the main

    xbmc.log("[Callback] > process, pid %s" % os.getpid(), level=xbmc.LOGNOTICE)



    try:

        #I'm sure that this url works. 

        #I also replaced with other existent urls to doublecheck

        url = "http://localhost:3000/next/" + button



        #it goes well

        request = urllib2.Request(url)



        #I receive a NoneType 

        response = urllib2.urlopen(request)



        #It prints "Responded <type 'NoneType'>"

        xbmc.log("Responded %s" % type(response), level=xbmc.LOGNOTICE)

    except Exception as exception:

        xbmc.log("Some error occurred %s " % exception, level=xbmc.LOGNOTICE)

    else:

        xbmc.log("It went well", level=xbmc.LOGNOTICE)



#Main function

if __name__ == '__main__':

    xbmc.log("[main] > process, pid %s" % os.getpid(), level=xbmc.LOGNOTICE)

    # Buttons Setup

    buttons = [

        {'gpio': 21, 'name': "button-1", 'state': False, 'led_pin': 26},

        {'gpio': 20, 'name': "button-2", 'state': False, 'led_pin': 19},

        {'gpio': 16, 'name': "button-3", 'state': False, 'led_pin': 13}

    ]



    # Starting with GPIO

    GPIO.setmode(GPIO.BCM)

    # GPIO Init

    for k in range(0, len(buttons)):

        GPIO.setup(buttons[k]['gpio'], GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

        GPIO.add_event_detect(buttons[k]['gpio'], GPIO.RISING, callback=play, bouncetime=300)



    while not monitor.abortRequested():



        #don't need to nothing here as the callback will be called

        #when some change will occurr in the gpio



        # Sleep/wait for abort for 200 ms

        if monitor.waitForAbort(1):

            xbmc.log("Exiting...", level=xbmc.LOGNOTICE)

            # Abort was requested while waiting. We should exit

            GPIO.cleanup() # clean up after yourself 

            break