Function CFNetworkExecuteProxyAutoConfigurationURL 

pub unsafe extern "C-unwind" fn CFNetworkExecuteProxyAutoConfigurationURL(
    proxy_auto_config_url: &CFURL,
    target_url: &CFURL,
    cb: CFProxyAutoConfigurationResultCallback,
    client_context: NonNull<CFStreamClientContext>,
) -> CFRetained<CFRunLoopSource>

Available on crate feature CFProxySupport only.

Safety

• cb must be implemented correctly.
• client_context must be a valid pointer.