Python determine if HTTPConnection failed to connect

Question

In Python, how I can determine if HTTPConnection failed to connect to server, for example, by bad server address?

import httplib
import sys
if len(sys.argv) != 2:
    print 'Usage: server'
    quit()
con = httplib.HTTPConnection(argv[1]) # how I can determine if this fails?

Answer 1

Try this after instantiating the object con.connect().

If the connection is unable to be made, this call will throw an exception.

Example:

>>> import httplib
>>> con = httplib.HTTPConnection('127.0.0.1')
>>> con.connect()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/httplib.py", line 772, in connect
    self.timeout, self.source_address)
  File "/usr/lib/python2.7/socket.py", line 571, in create_connection
    raise err
socket.error: [Errno 111] Connection refused