Answer by best wishes for How can I access my localhost from my Android device?

Although one answer has been accepted but this worked for me:

1. Make sure both your computer and android device are on same network.
2. get your computer's ip address. (in case of mac type ifconfig inside terminal and look for en0/en1 -> inet it should be something like 19*.16*.1.4.) (on windows, use `ipconfig)

3. Open your mobile settings and go to network-> long press your wifi network-> modify network -> scroll down to advanced options -> chose proxy manual and in proxy hostname type your address i.e. 19*.16*.1.4 inside port enter your port. and save it.

4. search for what is my ip in google chrome, and get your ip, lets say it is 1**.1**.15*.2**

5. try accessing 1**.1**.15*.2**:port/ from your mobile device.

It is as simple as this.