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Showing content from https://github.com/whatwg/fetch/issues/27 below:

Aborting a fetch · Issue #27 · whatwg/fetch · GitHub

Provide developers with a method to abort something initiated with fetch() in a way that is not overly complicated.

• Add timeout option #20
• Cancelling HTTP fetch w3c/ServiceWorker#592
• Returning a FetchPromise from fetch() w3c/ServiceWorker#625
• Getting errored/closed reader, Auto-releasing reader, Forcible cancel() on a stream streams#297
• Potential security issues when applied to fetch() tc39/proposal-cancelable-promises#4 (security issues)

We have two contenders. Either fetch() returns an object that is more than a promise going forward or fetch() is passed something, either an object or a callback that gets handed an object.

In order to not clash with cancelable promises (if they ever materialize) we should pick a somewhat unique method name for abortion. I think terminate() would fit that bill.

var f = fetch(url)
f.terminate()

Note: the Twitter-sphere seemed somewhat confused about the capabilities of this method. It would most certainly terminate any ongoing stream activity as well. It's not limited to the "lifetime" of the promise.

The limited discussion on es-discuss https://esdiscuss.org/topic/cancelable-promises seemed to favor a controller. There are two flavors that keep coming back. Upfront construction:

var c = new FetchController
fetch(url, {controller: c})
c.abort()

Revealing constructor pattern:

fetch(url, {controller: c => c.abort()})

• What is the effect on the promise? Both forever-pending and explicit rejection have reasonable arguments. We could offer the choice to the developer, but what should be the default?
• What is the effect on the stream? I suspect the Streams Standard is already conclusive on this.
• What syntax of the above two-three solutions do we favor?

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