HAFAS: post_with_cache_p: Use proxy if required and specified for service

		say '  cache miss';

	}

	$self->{ua}->post_p( $url, $self->{post} )->then(

	my $headers      = {};

	my $service_desc = $hafas_instance->{ $self->{active_service} };

	if ( $service_desc->{ua_string} ) {

		$headers->{'User-Agent'} = $service_desc->{ua_string};

	}

	if ( my $geoip_service = $service_desc->{geoip_lock} ) {

		if ( my $proxy = $ENV{"HAFAS_PROXY_${geoip_service}"} ) {

			$self->{ua}->proxy->http($proxy);

			$self->{ua}->proxy->https($proxy);

		}

	}

	$self->{ua}->post_p( $url, $headers, $self->{post} )->then(

		sub {

			my ($tx) = @_;

			if ( my $err = $tx->error ) {