Tell urllib2 to use custom DNS

Question

I\'d like to tell urllib2.urlopen (or a custom opener) to use 127.0.0.1 (or ::1) to resolve addresses. I wouldn\'t ch

Answer 1

Another (dirty) way is monkey-patching socket.getaddrinfo.

For example this code adds a (unlimited) cache for dns lookups.

import socket
prv_getaddrinfo = socket.getaddrinfo
dns_cache = {}  # or a weakref.WeakValueDictionary()
def new_getaddrinfo(*args):
    try:
        return dns_cache[args]
    except KeyError:
        res = prv_getaddrinfo(*args)
        dns_cache[args] = res
        return res
socket.getaddrinfo = new_getaddrinfo