strip_credentials: Get or remove user authentication credentials
Description
authentication credentials appear before the domain
name and look like user:password. Sometimes you want the removed,
or retrieved; strip_credentials and get_credentials do
precisely that
# NOT RUN {# Remove credentialsstrip_credentials("http://foo:bar@97.77.104.22:3128")
# Get credentialsget_credentials("http://foo:bar@97.77.104.22:3128")
# }