Get request to server in php?

Question

PHP

Conditions:
There is a company website written in Yii.
There is a company server located in their local network.

Task:
Make a Get request to the server on the given system admin ip, get a json file in response.
Get request must be executed from the site - as I understand it, access for its ip is open.

What happens to me: I
execute such commands -

$data - параметры запроса
$querydata = http_build_query($data);
file_get_contents("https://196.307.42.46:88/?" . $querydata);

I get:
failed to open stream: Connection refused

Conversation with the system administrator:

Me: "I'm making a request and it doesn't return anything. Error."
He: "What address is the request coming from?"
Me: "Must be from a site...so-and-so...?"
He: "yes, I made a forwarding from him
forwarded port 80 for the site address ... such and such ... to the server address",

Question:
What does probros mean?
What does port 80 mean?
How to make a request?