Support sendBeacon

[jackson-dean]

I have a request being sent using the native sendBeacon api which pretender does not intercept. Is this something that should/could be added? Or is it already somehow supported and I am just missing something?

[xg-wang]

I believe it doesn't

[xg-wang]

sendBeacon should be polyfillable by a POST xhr

[Aaronius]

We could really use this as well. @xg-wang I don't think I quite understand your last comment. Could you provide more context? If it's something relatively simple to do I may be able to help out.

[xg-wang]

@Aaronius My idea was we can include a small polyfill of let sendBeacon xhr under the hood, then the beacon can go through pretender's fake xhr. We might also need to set the 64kb limit when calling sendBeacon synchronously.
One thing I haven't thought is how to properly test those beacon outlive the document.

[xg-wang]

@jackson-dean @Aaronius thinking more on this, how do you think about something like this, and what else would you like to add?

const beaconHandler = server.sendBeacon('/api/beacon', true /* sendBeacon can only return boolean */);
beaconHandler.returns(false); // can control the return value
beaconHandler.numberOfCalls; // has same `numberOfCalls` as regular handlers
beaconHandler.async === false; // always sync