Plugins that reuse configs (e.g. axios-retry) don't work.

Describe the bug

In case of a retry (e.g. via axios-retry) the following error is thrown: https://github.com/3846masa/axios-cookiejar-support/blob/7b85d03ce3134915fb3a08077a6bf3973ea67ef1/src/index.ts#L21-L23

Reason: the same interceptor has already set proper agents to the request config in a previous failed request.

The retryCount on the screenshot is 1 which means that the same requested has already failed once and this is the first retry.

To Reproduce

Steps to reproduce the behavior:

run the code below.

Expected behavior

No error.

Code that reproduces the bug

const axios = require("axios");

const { CookieJar } = require('tough-cookie');
const client = axios.create({jar: new CookieJar()});

const axiosCookieJarSupport = require('axios-cookiejar-support').wrapper;
axiosCookieJarSupport(client);

const retry = require("axios-retry");
retry(client);

(async function () {
    await client("http://httpstat.us/503");
})()

Environments

• OS: macOS
• Node.js version: 14.20.0
• axios version: 1.1.2
• tough-cookie version: 4.1.2
• axios-cookiejar-support: 4.0.3

[andrewkucz]

@grenik Hello, funny I ran into the same exact issue. I decided to try my hand at a PR to implement a fix for this to allow agents if they are instances of Http(s)CookieAgent. Check it out, let me know if the approach is okay #609

[grenik]

Maybe you can simply check if an http(s) agent is a CookieAgent?

Also, FYI axios-retry removes http(s) agents if they are default ones, but I am not sure if other libs do the same (e.g. retry-axios): https://github.com/softonic/axios-retry/blob/9adaa6fe38175e696520fd6ba1b95231b89990f8/es/index.mjs#L113-L118

Also, a question: what to do in case of a proxy with authentication? We have a helper function that creates a pre-configured http agent to handle proxy with auth, but we cannot use it.