Using http service and its client in the same computer

I am going to develop a http service and an application as its 开发者_运维问答client which both of them are in the same computer.

I have 2 questions :

1. Might any firewall block this application?
2. If so, how can i solve the problem?

Tanx in advance.

No the firewall will not block the application.

You can use 127.0.0.1:80 to access the local http service. 80 is the default port number and you can drop it. Alternatively, you can use something like http://localhost to test it.