Function soup_sys::soup_proxy_resolver_get_proxy_async

pub unsafe extern "C" fn soup_proxy_resolver_get_proxy_async(
    proxy_resolver: *mut SoupProxyResolver, 
    msg: *mut SoupMessage, 
    async_context: *mut GMainContext, 
    cancellable: *mut GCancellable, 
    callback: SoupProxyResolverCallback, 
    user_data: gpointer
)