Is your feature request related to a problem? Please describe.

Axios 0.21.1 does not cope with requests through proxy to secured URLs - HTTP code 501 is received.
I'm behind corporate network. When I try to launch the following code, the error 501 is received:

const axios = require("axios");

axios.get('https://jsonplaceholder.typicode.com/todos/12', {
    proxy: {
        protocol: 'http',
        host: 'corporate.proxy',
        port: 9000
    },
})
    .then(response => response.data)
    .then(data => console.log(data))
    .catch((error) => {
        const errorMessage = error.message;
        const responseData = error.response && error.response.data;
        console.log('error')
        console.log(`${errorMessage}${
            responseData
            && typeof responseData === 'object'
                ? `: ${JSON.stringify(responseData)}`
                : ''}`)
    });

Requests made to unsecured URLs - http protocol - with or without proxy settings succeed.

Describe the solution you'd like

Fix or implement please a possibility to perform requests to secured URLs - https protocol - through proxy.

Describe alternatives you've considered

Instead of using "axios" module, the module "axios-https-proxy-fix" solves the issue. However, it's some old fix. And most probably does not update to new features that original Axios may bring. Definitely I would like to stick to primary.

Additional context

No solution is found around the original source.