Sending Early Hints from Workers

[sullen venture]

Is there a way that I can conditionally send early hints (103) from my workers?

I want to preload assets based on request headers and it looks like the Early Hints optimization in the Speed panel will cache the preload hints and serve them for all requests. Is that correct?

[tawdry moon]

You can send preload headers and things and these might end up cached and sent as early hints, yes, but there’s no way to explicitly send 103 responses in Workers before your normal response.