supportsHostname
Some proxy protocols expect to be passed a hostname, which they will resolve to an IP address themselves. Others, like SOCKS4, do not allow this. This function will return false if @proxy is implementing such a protocol. When false is returned, the caller should resolve the destination hostname first, and then pass a #GProxyAddress containing the stringified IP address to g_proxy_connect() or g_proxy_connect_async().
Return
true if hostname resolution is supported.
Since
2.26