Update header before send request

[Duc-Developer]

hi @josteink @KartikTalwar , when i check from your source code, i see you used XMLHttpRequest to handle every request.
When i used event gmail.observe.before('send_message',() => {...}), Is there any way I can update header using setRequestHeader
I tried to use it in this event but it doesn't seem to work

[josteink]

I've never tried doing that or created a business-case which depends on such behaviour.

So I really haven't considered that angle much when working with Gmail.js as a maintainer either, to be honest.

If it can be done, I wouldn't know.

[Duc-Developer]

Thank you for your feedback. I founded a quick solution for my project. I think there will be some cases where this function is needed, maybe you should consider this feature in the future.