API_V1_ROOT missing backslash causing requests to fail

[deadbits]

API_V1_ROOT is "api/v1" when it looks like it should be "/api/v1" or requests to the API fail because otx.alienvault.comapi is not a valid hostname for HTTP requests. I'm on Python 2.7.11 just fyi.

• Line: https://github.com/AlienVault-Labs/OTX-Python-SDK/blob/master/OTXv2.py#L17

Simply prepending a backslash to the API_V1_ROOT variable fixed this for me when I reinstalled the latest master branch locally. Added the backslash to the line above, ran pip install . --upgrade, and it worked as expected.

API call & Traceback:

>>> mirai_iocs = otx.get_pulse_indicators('58e39804b789b25b15083fc6', limit=219)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    mirai_iocs = otx.get_pulse_indicators('58e39804b789b25b15083fc6', limit=219)
  File "/usr/local/lib/python2.7/site-packages/OTXv2.py", line 404, in get_pulse_indicators
    return self.walkapi(self.create_url(PULSE_DETAILS + str(pulse_id) + "/indicators", limit=limit))
  File "/usr/local/lib/python2.7/site-packages/OTXv2.py", line 274, in walkapi
    return list(self.walkapi_iter(url, max_page=max_page))
  File "/usr/local/lib/python2.7/site-packages/OTXv2.py", line 265, in walkapi_iter
    data = self.get(next_page_url)
  File "/usr/local/lib/python2.7/site-packages/OTXv2.py", line 112, in get
    proxies=self.proxies,
  File "/usr/local/lib/python2.7/site-packages/requests/sessions.py", line 501, in get
    return self.request('GET', url, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/requests/sessions.py", line 488, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python2.7/site-packages/requests/sessions.py", line 609, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/requests/adapters.py", line 487, in send
    raise ConnectionError(e, request=request)
ConnectionError: HTTPSConnectionPool(host='otx.alienvault.comapi', port=443): Max retries exceeded with url: /v1/pulses/58e39804b789b25b15083fc6/indicators?limit=219 (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x10c0d5110>: Failed to establish a new connection: [Errno 8] nodename nor servname provided
, or not known',))

As shown above the ConnectionError is failing due to HTTPSConnectionPool(host='otx.alienvault.comapi', port=443) where the host variable is not a valid hostname.

After Patch:

>>> from OTXv2 import OTXv2
>>> otx = OTXv2(key)
>>> mirai_iocs = otx.get_pulse_indicators('58e39804b789b25b15083fc6', limit=100)
>>> len(mirai_iocs)
100