Connect Android Device To Web Service On Laptop

In my house I can connect my android device to the service in my laptop as they are both on the same network. My question is, supossing I'm going to a bar and I can connect my lapt

Solution 1:

I haven't tried Connectify, but Virtual Router worked for me. There are some more instructions here if you need it.

Solution 2:

My question is, supossing I'm going to a bar and I can connect my laptop to the wifi but not the cellphone, how can I make the cellphone reach the web service on the laptop?

Most likely, you can't. The bar is unlikely to have given you a public IP address, and it unlikely that you will convince the bartender to allow you to modify their firewall to forward a port to your notebook.