docs: def http_log_graph(self, stream):
          ''' Build up a graph (nodes and edges from a Bro http.log) '''
          print 'Entering http_log_graph...'
          for row in list(stream):
  
              # Skip '-' hosts
              if (row['id.orig_h'] == '-'):
                  continue
  
              # Add the originating host
              self.add_node(row['id.orig_h'], row['id.orig_h'], ['host', 'origin'])
  
              # Add the response host and reponse ip
              self.add_node(row['host'], row['host'], ['host'])
              self.add_node(row['id.resp_h'], row['id.resp_h'], ['host'])
  
              # Add the http request relationships
              self.add_rel(row['id.orig_h'], row['host'], 'http_request')
              self.add_rel(row['host'], row['id.resp_h'], 'A')