How to base64 encode request with cURL?

Question

bash

Good day. How to base64 encode request with cURL? There is the request itself:
curl -d "exmple=$1&log=$reslt" -X POST example.com
It needs to be encoded in base64: exmple=$1&log=$reslt. How can I do that.
PS: Googled, but found examples only with .img and text files.

Answer 1

curl -d `echo -n "exmple=$1&log=$reslt" | base64` -X POST example.com

Answer 2

curl -d $(base64<<<"exmple=$1&log=$reslt") -X POST example.com