In my case I have a `http_proxy` env variable on my development computer which passes all traffic to my vpn, however this proxy would fail to work when hostname is `localhost`, therefore when I'm testing my application it always fails because I setup my server at localhost, I want a method to force axios receiving a `none` for proxy config, currently if `proxy` property is `null` or `undefined` it will use the `http_proxy` env
lib/adapters/http.js
} else {
      if (config.maxRedirects) {
        options.maxRedirects = config.maxRedirects;
      }
      transport = isHttps ? httpsFollow : httpFollow;
    }
    
    var req = transport.request(options, function handleResponse(res) {
      if (req.aborted) return;
      
      clearTimeout(timer);
      timer = null;
      
      var stream = res;
      switch (res.headers['content-encoding']) {
      
      case 'gzip':
      case 'compress':
      case 'deflate':
        
        stream = stream.pipe(zlib.createUnzip());
        
        delete res.headers['content-encoding'];
        break;
      }
      
      var lastRequest = res.req || req;
      var response = {
        status: res.statusCode,
        statusText: res.statusMessage,