Same File, Three Addresses Unit 3

A second address

Files have addresses. So do machines. You find your LAN IP, see what is listening, start a real server, and load the page at http://localhost:8000. Then you type that same URL on your phone. You leave holding a working laptop URL and a phone that cannot see it.

A laptop browser showing localhost:8000 next to a phone that cannot load the same address.
The laptop can see the page. The phone cannot. That is the point of this unit.

Topics

Your machine has an address
Ports are doors
Start a server
Read the conversation — then try your phone

Unit test

Quick check: can you name your LAN IP, start the server, read a status code, and say what just happened on the phone?

Take the unit test →

Project

Network Self-Portrait

Map your machine on the network: its LAN IPv4 and which private block it sits in, the default gateway, what is listening, and proof from your screen that loopback is not the LAN address. ---

HTTP Field Notes

Capture three real HTTP exchanges — a public site, a redirect, and your own server — then show what file:// lacks that all of them have. Report what your phone does with http://localhost:8000. Do not fix it. ---

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