Using Json string in the Http Header

Question

Recently I run into some weird issue with http header usage ( Adding multiple custom http request headers mystery) To avoid the problem at that time, I have put the fields i

Answer 1

From what I understand using a json string in the header option is not as much of an abuse of usage as using http DELETE for http GET, thus there has even been proposal to use json in http header. Of course more thorough insights are still welcome and the accepted answer is still to be given.