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Firebase Cloud Messaging InvalidApnsCollapseId error encountered when sending a push notification.
Understanding Firebase Cloud Messaging
Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that allows you to reliably send messages at no cost. It supports messaging between server applications and mobile devices on iOS, Android, and the web. FCM is widely used for sending notifications, updates, and other types of messages to users.
Identifying the Symptom
When using FCM to send notifications to iOS devices, you might encounter an error message stating InvalidApnsCollapseId. This error indicates an issue with the collapse ID used in the notification payload.
What is Observed?
Developers notice that their push notifications are not being delivered to iOS devices, and upon checking the logs, the error InvalidApnsCollapseId is displayed.
Explaining the Issue
The InvalidApnsCollapseId error occurs when the collapse ID provided in the notification payload is not valid. The collapse ID is used by APNs (Apple Push Notification service) to identify and collapse multiple notifications into a single notification. This is particularly useful for notifications that update frequently, such as live scores or chat messages.
Common Causes
- The collapse ID is not a string.
- The collapse ID exceeds the maximum allowed length.
- The collapse ID contains invalid characters.
Steps to Fix the Issue
To resolve the InvalidApnsCollapseId error, follow these steps:
Step 1: Validate the Collapse ID
Ensure that the collapse ID is a valid string. It should be alphanumeric and not exceed the maximum length of 64 bytes. Avoid using special characters.
Step 2: Modify Your Code
Check the part of your code where the collapse ID is set. Ensure it adheres to the guidelines mentioned above. For example:
const payload = {
notification: {
title: 'New Message',
body: 'You have a new message.',
},
apns: {
headers: {
'apns-collapse-id': 'message_12345' // Ensure this is a valid string
}
}
};
Step 3: Test the Notification
After making the necessary changes, test the notification delivery to ensure the error is resolved. You can use tools like Firebase Console or FCM API to send test messages.
Additional Resources
For more information on using FCM with iOS, refer to the official Firebase documentation. If you continue to experience issues, consider reaching out to the Firebase Support Team.
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Firebase Cloud Messaging InvalidApnsCollapseId error encountered when sending a push notification.
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