How to access nodejs/expressjs in localhost from a android device

I have nodejs/expressjs in my localhost, expressjs as rest API, return json file into client (android device).I am using Ionic 2 to build android app. I have been success access to localhost from android device if using Apache and PHP. in Apache.conf I set like this:

<Directory />
 Allow from all          
 </Directory>

Turn off firewall, and working perfectly

With nodejs/expressjs :

I build app and install it into android device, and try connect always failed, error connection. but if i use chrome browser in android with address 192.168.xx.x:8100 working perfect. how to solve this?

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