httplib2.py 文件源码

def connect(self):
        """Connect to the host and port specified in __init__."""
        # Mostly verbatim from httplib.py.
        msg = "getaddrinfo returns an empty list"
        for res in socket.getaddrinfo(self.host, self.port, 0,
                socket.SOCK_STREAM):
            af, socktype, proto, canonname, sa = res
            try:
                if self.proxy_info and self.proxy_info.isgood():
                    self.sock = socks.socksocket(af, socktype, proto)
                    self.sock.setproxy(*self.proxy_info.astuple())
                else:
                    self.sock = socket.socket(af, socktype, proto)
                # Different from httplib: support timeouts.
                if self.timeout is not None:
                    self.sock.settimeout(self.timeout)
                    # End of difference from httplib.
                if self.debuglevel > 0:
                    print "connect: (%s, %s)" % (self.host, self.port)
                self.sock.connect(sa)
            except socket.error, msg:
                if self.debuglevel > 0:
                    print 'connect fail:', (self.host, self.port)
                if self.sock:
                    self.sock.close()
                self.sock = None
                continue
            break
        if not self.sock:
            raise socket.error, msg