Why are preload link not working for JSON requests ?

Question

The JavaScript on my website loads several JSON to initialize itself.

I would like to preload them so, when the JavaScript will launch an Ajax request on it, they wi

Answer 1

If you have the same problem as me, your response is probably being sent with Vary: Accept, the preload request is sent with Accept: */*, and the fetch/xhr request is being made with Accept: application/json.

It seems like the preload Accept: behavior can't be changed (sigh), so you'll have to either remove the Vary: Accept, or make the fetch/xhr request with a matching Accept: header.