What is the scope of a service worker, and how can it be controlled?

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ICSM Computer · Answer

Scope of a Service Worker
The scope of a service worker defines the set of pages (URLs) and requests it can
control.
By default, the scope is limited to the directory of the service worker file and all subdirectories.
For example:
If you register /sw.js, it will control / and everything under it.If you register /scripts/sw.js, it will control /scripts/ and all subpaths.
How to Control Scope
When registering the service worker in JavaScript, you can explicitly set its scope using the
scope option:
navigator.serviceWorker.register('/sw.js', {
  scope: '/app/'
}).then(function(registration) {
  console.log('Service Worker registered with scope:', registration.scope);
});
Here:
/sw.js is the service worker file.scope: '/app/' means it will only control URLs starting with 
/app/.
Rules and Limitations
Same-origin rule: The scope must be within the same origin as the service worker file.
You can’t register a service worker to control another domain or higher-level path than where it is served from.
Default scope: If you don’t specify scope, it defaults to the worker file’s directory and below.Max scope: The scope cannot be broader than the service worker file’s path.
Example: If sw.js is at /app/sw.js, it cannot control 
/ (the root).Multiple workers: Different service workers can be registered for different scopes on the same origin.
Summary:
Scope = which URLs the 
service worker controls.Default = its directory + subdirectories.Controlled by scope option in register().Restricted by origin and path rules.

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What is the scope of a service worker, and how can it be controlled?

Anubhav Kumar

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1 Answers

Scope of a Service Worker

How to Control Scope

Rules & Limitations

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