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7/5/2026
The Push Notification Bug That Took Three Layers to Find

The Push Notification Bug That Took Three Layers to Find

Short summary

A developer spent 1.5 hours debugging why a push notification never arrived despite successful permission prompts and API confirmations. Three separate systems were at fault: CSP rules blocking OneSignal's initialization, confusion between message creation and actual device delivery, and a cached service worker from a previous deployment. The lesson: interconnected systems can silently fail without obvious error messages.

  • •CSP security policy blocked OneSignal's required initialization script
  • •API success response confirmed message creation but not delivery to devices
  • •Cached service worker from previous deployment intercepted notifications

Generated with AI, which can make mistakes.

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