Actual Coinbase Client HTTP (Get & Post)

I like coinbase, seems like a pretty robust API, but sadly there are documentation bugs and they arent so hot at replying to support issues. After some thinking I figured out why the API calls were thinking they were not JSON.

	# there is a problem with the coinbase python example
	# at https://coinbase.com/docs/api/authentication where they
	# fail to add the content type header to the POST action
	# this is the actual implementation
	def get_http(self, url, body=None):
	opener = urllib2.build_opener()
	nonce = int(time.time() * 1e6)
	message = str(nonce) + url + ('' if body is None else body)
	signature = hmac.new(settings.COINBASE_API_SECRET, message, hashlib.sha256).hexdigest()
	opener.addheaders = [('ACCESS_KEY', settings.COINBASE_API_KEY),
	('ACCESS_SIGNATURE', signature),
	('ACCESS_NONCE', nonce)]
	try:
	response = opener.open(urllib2.Request(url,body,{'Content-Type': 'application/json'}))
	return response
	except urllib2.HTTPError as e:
	print e
	return e

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