What are the best practices for unsubscribing and resubscribing to feeds in pubsubhubbub to avoid receiving duplicate notifications?

When unsubscribing and resubscribing to feeds in pubsubhubbub, it is important to first unsubscribe from the feed before resubscribing to avoid receiving duplicate notifications. This can be achieved by sending an unsubscribe request to the hub before subscribing to the feed again. 

// Unsubscribe from the feed
$unsubscribe_url = 'https://pubsubhubbub.appspot.com/subscribe';
$unsubscribe_data = array(
    'hub.mode' => 'unsubscribe',
    'hub.callback' => 'your_callback_url_here',
    'hub.topic' => 'your_feed_topic_here',
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $unsubscribe_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($unsubscribe_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

// Resubscribe to the feed
$subscribe_url = 'https://pubsubhubbub.appspot.com/subscribe';
$subscribe_data = array(
    'hub.mode' => 'subscribe',
    'hub.callback' => 'your_callback_url_here',
    'hub.topic' => 'your_feed_topic_here',
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $subscribe_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($subscribe_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

Keywords

pubsubhubbub feeds unsubscribing resubscribing duplicate notifications

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