httpProxy PUT method not support blob

I want put the blob file which upload from local or fetch from remote to AWS.

The code:

notice the body field:

error:

besides, the res.data.body is not have blob() method, why?

and more, please add this info to the document…:

The doc say the only difference between craft.httpProxy.fetch with broswer fetch method is CORS, but there have a huge difference… :frowning: