Minor Description
The body regex on a Rackspace Load Balancer HTTP/HTTPS health monitor is optional. However, if you specify a blank string for body_regex to libcloud, it converts that into a JSON 'bodyRegex': '' value, which the Rackspace LB API does not like. Instead, the value should not be spcified in the JSON. In addition, the JSON that comes back when GETting a load balancer that has an HTTP/HTTPS monitor, but does not have a body regex specified, will not have a bodyRegex JSON, so the value will be converted in libcloud to None, instead of to an empty string.