Programming Tutorials

  You have integrated the PropellerAds script, deployed your application, and checked your browser console only to find a critical error:   GET /sw.js 404 (Not Found) . Consequently, your push notification revenue stream fails to initialize, and the ad network dashboard reports your zone as "Not Verified." This is a ubiquitous issue in modern JavaScript development environments. While PropellerAds provides the  sw.js  file, modern bundlers like Webpack, Vite, or Parcel do not automatically place this file where the browser expects it. This guide details the root cause of this scope error and provides a rigorous, architectural solution to correctly bundle and serve the Service Worker file using Webpack and standard PWA practices. The Root Cause: Service Worker Scope and Bundling To fix the 404 error, you must first understand the strict security model of Service Workers and how build pipelines disrupt it. 1. The Scope Constraint A Service Worker can only control clien...