Website not opening on localhost via Selenium Webdriver?

Question

Python

Python code, browser - firefox. The site on localhost manually opens.
This code works: This one doesn't: What could be the problem?
driver.get("https://www.site.com/")
driver.get("http://localhost/site.com")

Answer 1

try specifying the port explicitly
like:

localhost:8081/site.com

Or what is it on?
not sure if that will help, but would start with this
A exactly at the end of site.com?
Maybe still

localhost:8081

?