Question 1

How do I set up APNS/2 with JWT authentication instead of certificates?

Accepted Answer

Obtain a .p8 signing key from Apple along with your Key ID and Team ID. Use token.AuthKeyFromFile to load the key, create a token.Token struct, and initialize the client with apns2.NewTokenClient(token). This method supports both development and production environments with one key.

Question 2

APNS/2 vs gorush for push notifications in Go?

Accepted Answer

APNS/2 is a lightweight library focused on raw APNs integration with HTTP/2 and modern features, ideal for direct use in Go apps. Gorush is a standalone server with more features like a dashboard and multi-platform support, better for teams wanting an all-in-one solution.

Question 3

How to handle errors when a push notification fails?

Accepted Answer

APNS/2 distinguishes between connection errors and APNs responses. Check the err variable for unrecoverable issues, and use res.Sent() to see if the push succeeded. The response includes status code, APNs ID, and a reason string for debugging failures.

Question 4

What's the best way to achieve high performance with APNS/2?

Accepted Answer

Keep a single apns2.Client instance or one per CPU core, as the underlying HTTP/2 connection pool allows high throughput. The README notes that performance depends on server location and network quality, with AWS-based servers achieving thousands of pushes per second.

Question 5

Can I use APNS/2 for background or silent notifications?

Accepted Answer

Yes, by setting the payload's content-available flag to 1 using the payload builder. APNS/2 supports all standard APNs payloads, allowing for background updates without user-visible alerts.

Question 6

How to test push notifications in development mode?

Accepted Answer

Use the Development() method when creating the client, e.g., client := apns2.NewClient(cert).Development(). This connects to Apple's sandbox APNs server for testing with apps running directly from Xcode or development builds.

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