{'args': {}, 'data': '', 'files': {}, 'form': {'foo': 'bar'}, 'headers': {
    'Accept-Encoding': 'identity', 'Content-Length': '7', 'Content-Type':
    'application/x-www-form-urlencoded', 'Host': 'httpbin.org',
    'User-Agent': 'Python-urllib/3.3'}, 'json': null, 'origin': '127.0.0.1',
    'url': 'https://httpbin.org/post'}
Python: How to send POST request?