Double http call to endpoints

[danielalmeidagoncalves]

This is more of a question rather than an issue. I am still a newby when we are talking about service workers. But my question is, it is normal that when I register a web worker trough UpUp that whenever I call a specific endpoint in my frontend this triggers 2 times the same request? For example if I inspect the network tab on the Chrome Developer Tool something like this is shown:

Name	Status	Type	Initiator	Size	....
myEndpoint	200	xhr	angularjs	from (ServiceWorker)	....
(gear Icon) myEndpoint	200	fetch	upup.sw	700 B	....

My fear is that by integrating UpUp and service worker related development I am introducing a double request problem for each time I call internal our external API.