Replace hard-coded port 80 by $_SERVER['SERVER_PORT']

[Alkarex]

In order for the demo to work out of the box on a test server (often on a port different from 80 such as 8080), here is a suggestion to default to $_SERVER['SERVER_PORT'] instead of a hard-coded port 80.
Of course, the explicit configuration in parameters.json still has precedence.

[bshaffer]

@Alkarex thank you so much for this change!

I have made the change slightly different, as to avoid changing the Curl class itself, I pass in the port to the constructor in index.php, and added the Curl object to the container (see a156e20).

Will you test this change and see if it meets your requirements?

[Alkarex]

Thanks for the fast response!
Yes, it works well on a test server using port 8080 after the patch 319e741 and it is nicer than the previous approach 👍

[bshaffer]

Teamwork! Glad to hear it :)