If m_request.isKeepAlive flag is false and the request has to be retried, e.g.

in case of HTTP authentication, then make sure the isKeepAlive flag is reset to
true since we have already carried out what the server requested and closed the
previous connection.

Otherwise, proxied connections that rely on authentication scheme that requires
persistent connection such as NTLM will fail.

BUG: 284870
FIXED-IN: 4.7.3