httpsAgent does not work in combination with an HTTP-proxy.

Description

I try to setup HTTPS-session using Axios which works fine through Fiddler. This fails by the way on the current stable release v0.18.0, I guess this is issue #925, fixed in #959.

As soon as I remove Fiddle, it no longer works. I suspect that it is, because the connection is pooled by Fiddler. So in order to make it work without the Fiddler proxy, I inject httpsAgent to keep the connection alive e.g.:

import * as http from 'https';
import * as https from 'https';

const Fiddler = {
  host: '127.0.0.1',
  port: 8888
};

this.axios = Axios.create({
   proxy: Fiddler
   httpAgent: new http.Agent({keepAlive: true}),
   httpsAgent: new https.Agent({keepAlive: true, rejectUnauthorized: false})

I can’t get it work with the https-agent assigned, not with a proxy:

Stacktrace:

TypeError [ERR_INVALID_PROTOCOL]: Protocol "http:" not supported. Expected "https:"
    at new ClientRequest (_http_client.js:118:11)
    at Object.request (http.js:41:10)
    at RedirectableRequest._performRequest (node_modules\follow-redirects\index.js:186:24)
    at new RedirectableRequest (node_modules\follow-redirects\index.js:69:8)
    at Object.wrappedProtocol.request (node_modules\follow-redirects\index.js:363:14)
    at dispatchHttpRequest (node_modules\axios\lib\adapters\http.js:180:25)
    at new Promise (<anonymous>)
    at httpAdapter (node_modules\axios\lib\adapters\http.js:20:10)
    at dispatchRequest (node_modules\axios\lib\core\dispatchRequest.js:59:10)

Not without a proxy.

Context

• axios version: e.g.: (v0.19.0-beta.1)[https://github.com/axios/axios/releases/tag/v0.19.0-beta.1]
• Environment: e.g.: node v10.13.0, Windows 10

Related issues

• #1885 (that one using a socks proxy, therefor I consider this one to be different)

[elegisandi]

waiting for the new release 😃

[JitixPhotobox]

I have opened a PR to fix this issue : https://github.com/axios/axios/pull/2426