test.py

# -*- coding: utf-8 -*-
import gc

import objgraph
import tornado
import tornado.httpclient

def main():
    client = tornado.httpclient.HTTPClient()
    try:
        client.fetch('http://127.0.0.1:60000')  # connection refused
    except:
        pass
    finally:
        client.close()

    gc.collect()

    objs = objgraph.by_type('_HTTPConnection')
    if objs:
        objgraph.show_backrefs(objs[0], filename='backref.png')

if __name__ == '__main__':
    main()