UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Steps to reproduce the problem:
1. install any proxy addon like swithyomega
2. turn on the proxy
3. noticed the request received on server side has has a little bit different then the previous on (without proxy on)

What is the expected behavior?
request should be same when chrome proxy is on

What went wrong?
I am doing web develop and I use chrome proxy addons switchyomega to do quick proxy setting.

The proxy server I am using is based on node express, which is running on localhost 3000

I noticed that when I turn on proxy (which redirects my web page request to nodejs express which runs on localhost 3000 ), the request object received by express changed a little bit

e.g.

If I type http://localhost:3000 in address bar, without proxy addon turned on, in node express I get a request object with url property value "/" But when I turn on proxy(I do not by pass localhost), I get a request object with url property value "localhost:3000"

Any idea what is going on when the chrome proxy addon is on ? Thanks.

WebStore page: 

Did this work before? N/A 

Chrome version: 61.0.3163.100  Channel: stable
OS Version: OS X 10.12.6
Flash Version: