What's the "content-encoding" header a POST with a base64 image?

Syntax question.

I want to send an image in base64 format through the Bubble Connector. I was told by the API vendor that
“you can upload a base 64 encoded image as long as you include the content-encoding header”.

Any idea what this means?

Specifically,

You might want to check this one.

Thanks. Ended up solving this with an AWS Lambda call which afforded more flexibility than POSTing an image from the Bubble Connector directly.