Service worker is a script which runs in background and it is which that doesn't require any user interaction functionality, separate from the webpage tho today we are having background sync and notification on page as a future included.
These service functions may also be called as api (application program interface) on their functionality, because these does all the work which are need to be done by api's it's a prediction that these service workers may bear all GPS and RFID ( radio frequency identification ) in future, before these service workers there is something called application cache, to keep away of this cache on the browser.
Being a javascript it cannot access documentation object module which is independent of application programme interface directly,so service workers make a platform with the pages and take control over responses and revert them with post message interface, these pages now can get responses from object module, basically service worker is designible ( rewritable) network deputy allowing to control page request and handle the page.
Service workers use promises often now and then, promise is the placeholder which is the result of non existing API, as java is a thread formed script there is o method to showup results.promises can be fulfilled, rejected can also be pending and be settled. service workers get the job done by putting XML HTTP request.
XMLHTTPREQUEST :
It's an api which establishes an independent connection channel between web pages i.e client and server.
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