Custom HTTP headers in `fetch` in plugins

Hello,

I’m creating an internal Figma Plugin and I noticed that your fetch function is custom one and that not all HTTP headers are exposed by it. In fact, only content-length and content-type seems to be available.

My plugin would need to read additional information from the header since I’m using binary data (image) in the response and I don’t want to implement multipart form parsing just to add these small data (HTTP header would be very practical for it).

Is there any solution? For now I’m using a workaround to pass that data in content-type but as you can imagine, that’s not ideal 🙂

Thank you for any help.
Jiri