I cant call method in another system

Hi. My local system working properly, when i upload it in server after press submit button it gets error:

This site can’t be reached
127.0.0.1 refused to connect.

The error message says that you or your code are trying to connect to 127.0.0.1, which is your local system and not a remote server. Is this hard-coded somewhere, or perhaps in your base_url config?