Baseline Widely available
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The getState() method of the NavigationPreloadManager interface returns a Promise that resolves to an object with properties that indicate whether preload is enabled and what value will be sent in the Service-Worker-Navigation-Preload HTTP header.
None.
Return valueA Promise that resolves with an object that has the following properties:
enabled
true if preloading is enabled, and false otherwise.
A string containing the value that will be sent in the Service-Worker-Navigation-Preload HTTP header following a preloading fetch(). This defaults to true unless the value was changed using NavigationPreloadManager.setHeaderValue().
InvalidStateError DOMException
There is no active worker associated with the registration to which this NavigationPreloadManager belongs.
The code below shows a request for the current state, made once the service worker is ready.
navigator.serviceWorker.ready
.then((registration) => registration.navigationPreload.getState())
.then((state) => {
console.log(state.enabled); // boolean
console.log(state.headerValue); // string
})
.catch((e) =>
console.error(`NavigationPreloadManager not supported: ${e.message}`),
);
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4