How to send gzip compressed body

[richzw]

We want to send compressed body by gzip HTTP request in chai-http in mocha.

let chai = require('chai');
let chaiHttp = require('chai-http');
const zlib = require('zlib');

chai.use(chaiHttp);


object = {
    "content": {
        "data": {
            "key": "testval"
        }
    }
};

const objStr = JSON.stringify(object);
const objBuf = Buffer.from(objStr, "utf-8");
const bodyContent = zlib.gzipSync(objBuf);
const bodyLen = Buffer.byteLength(bodyContent, 'utf-8');

chai.request("http://serverurl")
    .post('/path')
    .set('Content-Type', 'application/json')
    .set('Content-Encoding', 'gzip')
    .set('Content-Length', bodyLen) 
    .set('Accept-Encoding', 'gzip')
    .send(bodyContent)
    .end((err, res) => {
        expect(err).to.be.null;
        expect(res).to.have.status(200);

        done();
    });

However, we met the error Error: incorrect header check at Zlib.zlibOnError on the server-side. Is there anything am I missing?