Basic networking. When a program says "I want to talk to a system over the network", they ALL need to know what port to talk on.
Coders make this easier - first, we've got generalised standards for the usage of ports, and secondly, we use those standards when writing applications. In this case, port 80 is the standard port for http connections, and browsers are mostly coded to try port 80 for http if they are not given one by the user.
So you don't need to do anything. Unless you've really messed up your browser settings, or you're deliberately using one that doesn't try the standards, you'll find http://127.0.0.1 and http://127.0.0.1:80 behave exactly the same.
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