how to validate axios is compatible with my proxy

passthrough-proxy-headers-test.mjs

import { HttpsProxyAgent } from "https-proxy-agent";
import * as https from "https";

const { CAS_HTTPS_PROXY } = process.env;

const agent = new HttpsProxyAgent(CAS_HTTPS_PROXY);

const headers = {
  "User-Agent": "axios/1.6.8",
  "Accept-Encoding": "gzip, compress, deflate, br",
  Accept: "application/json, text/plain, */*",
};

https.get("https://www.google.com", { agent, headers }, (res) => {
  console.log("headers test", res.statusCode);
});

for (let header of Object.keys(headers)) {
  const testHeader = {
    [header]: headers[header],
  };
  console.log(testHeader);
  https.get("https://www.google.com", { agent, headers: testHeader }, (res) => {
    console.log("single header", header, res.statusCode);
  });
}

https.get("https://www.google.com", { agent }, (res) => {
  console.log("no headers test", res.statusCode);
});

passthrough-proxy.mjs

import { HttpsProxyAgent } from "https-proxy-agent";
import axios from "axios";

const { CAS_HTTPS_PROXY } = process.env;

const agent = new HttpsProxyAgent(CAS_HTTPS_PROXY);

const api = axios.create({
  httpsAgent: agent,
//   remove hedaers
//     headers:{
//     "User-Agent": null,
//     "Accept-Encoding": null,
//     Accept: null
//   }
});

api
  .get("https://google.com")
  .then((r) => {
    console.log(r.status);
  })
  .catch((e) => {
    console.error(e);
  });

passthrough-proxy.py

import requests
import os

session = requests.Session()

proxy_url = os.environ.get("CAS_HTTPS_PROXY")
https_proxy = os.environ.get("HTTPS_PROXY")

if proxy_url:
    session.proxies = {"https": proxy_url}

if proxy_url or https_proxy:
    print("using proxy")


res = session.get("https://www.google.com")

print(res.status_code)

proxy-test.mjs

import axios from "axios";
import https from "https";
import URL from "url";
import fs from "fs";

const { CAS_HTTPS_PROXY, CAS_HTTPS_CA } = process.env;

const url = URL.parse(CAS_HTTPS_PROXY);

const api = axios.create({
  httpsAgent: new https.Agent({
    ca: fs.readFileSync(CAS_HTTPS_CA),
  }),
  proxy: {
    host: url.hostname,
    port: parseInt(url.port, 10),
    protocol: url.protocol,
  },
});

api
  .get("https://google.com")
  .then((r) => {
    console.log(r.status);
  })
  .catch((e) => {
    console.error(e);
  });

for passthrough proxy without ssl termination (passthrough-proxy.mjs)
How to run:

mkdir proxy-test
cd proxy-test
npm init -y
npm i axios https-proxy-agent

Now create a file with the content above passthrough-proxy.mjs and run it with proxy details.

Example:
CAS_HTTPS_PROXY=http://localhost:8080 node proxy-test.mjs