angular - 503 ok (from serviceWorker)

Question

I used @angular/service-worker to generate SW for an angular4 web app. after updating the ngsw-manifest.json to handle dynamic request from the server I get "Status Code:503 OK (from ServiceWorker)" when offline (after first loading).

Any thoughts?

Answer 1

your problem is related with [Content Security Policy (CSP)] configuration on your web server or proxy nginx. Due you are connecting properly with nginx, the PWA offline feature is not enabled in your browser.

read more on (https://content-security-policy.com/).