gpio_callbacks.py

import RPi.GPIO as GPIO
import urllib.request

PIN = 5

LOW_CALLBACK_ADDRESS = 'http://google.com'
HIGH_CALLBACK_ADDRESS = 'http://facebook.com'

DEBOUNCE_TIME_MS = 200

GPIO.setmode(GPIO.BOARD)
GPIO.setup(PIN, GPIO.IN)

def on_high():
	print('High')
	urllib2.urlopen(HIGH_CALLBACK_ADDRESS).read()

def on_low():
	print('Low')
	urllib2.urlopen(LOW_CALLBACK_ADDRESS).read()

GPIO.add_event_detect(PIN, GPIO.RISING, on_high, bouncetime=DEBOUNCE_TIME_MS)
GPIO.add_event_detect(PIN, GPIO.FALLING, on_low, bouncetime=DEBOUNCE_TIME_MS)