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

Base64encode it before sending. Just like how JSON Web Token do it.
Here's a NodeJs Example:

const myJsonStr = JSON.stringify(myData);
const headerFriendlyStr = Buffer.from(myJsonStr, 'utf8').toString('base64');
res.addHeader('foo', headerFriendlyStr);

Decode it when you need reading:

const myBase64Str = req.headers['foo'];
const myJsonStr = Buffer.from(myBase64Str, 'base64').toString('utf8');
const myData = JSON.parse(myJsonStr);