google apps script with UrlfetchApp.fetchAll() or with async/ await for multiple http requests?

Question

I created some projects in google apps script in the past for some automation, that also included some http-fetches. In the past, this worked with.fetch() pretty well, but now we need to fetch multiple urls. Since apps script now uses V8 runtime I considered to do so with promises. I'm also quite new to async/await and promises in general. So I considered to try the UrlfetchApp.fetch() within async functions, just to find out, that there's no difference in execution time.

I red, that UrlfetchApp.fetch() will always be sync, no matter whether you declare your function as async or not, due to the GAS-API-design. But I can't find detailed infos on this. Is this true?

If yes: Then the only way to fetch multiple urls would be UrlfetchApp.fetchAll(), right?

If no: Means simple.fetch() would work inside async funcs (and could be chained in Promise.all()) then I'd invest further time in this.

So, yes or no would help a lot here!

Thanks in advance!

Answer 1

Currently, Urlfetchapp runs synchronously and although the syntax of promises are supported, it works synchronously too.

Then the only way to fetch multiple urls would be UrlfetchApp.fetchAll(), right?

Yes