proxy_resolver
Description:
A [iface@Gio.
ProxyResolver] to use with this session.
If no proxy resolver is set, then the default proxy resolver will be used. See [func@Gio.ProxyResolver.get_default]. You can set it to null if you don't want to use proxies, or set it to your own [iface@Gio.ProxyResolver] if you want to control what proxies get used.