code: def http_get_csv_data(self, section=None):
          
          metrics = []
          req = urllib2.Request(self._get_config_value(section, 'url'))
          try:
              handle = urllib2.urlopen(req)
              return handle.readlines()
          except Exception as e:
              if not hasattr(e, 'code') or e.code != 401:
                  self.log.error("Error retrieving HAProxy stats. %s", e)
                  return metrics
  
          # get the www-authenticate line from the headers
          # which has the authentication scheme and realm in it
          authline = e.headers['www-authenticate']
  
          # this regular expression is used to extract scheme and realm
          authre = (r'''(?:\s*www-authenticate\s*:)?\s*''' +
                    '''(\w*)\s+realm=['"]([^'"]+)['"]''')
          authobj = re.compile(authre, re.IGNORECASE)
          matchobj = authobj.match(authline)
          if not matchobj:
              # if the authline isn't matched by the regular expression
              # then something is wrong
              self.log.error('The authentication header is malformed.')
              return metrics
  
          scheme = matchobj.group(1)
          # here we've extracted the scheme
          # and the realm from the header
          if scheme.lower() != 'basic':
              self.log.error('Invalid authentication scheme.')
              return metrics
  
          base64string = base64.encodestring(
              '%s:%s' % (self._get_config_value(section, 'user'),
                         self._get_config_value(section, 'pass')))[:-1]
          authheader = 'Basic %s' % base64string
          req.add_header("Authorization", authheader)
          try:
              handle = urllib2.urlopen(req)
              metrics = handle.readlines()
              return metrics
          except IOError as e:
              # here we shouldn't fail if the USER/PASS is right
              self.log.error("Error retrieving HAProxy stats. " +
                             "(Invalid username or password?) %s", e)
              return metrics
docs: Request stats from HAProxy Server