The 5G core network made a revolutionary design choice by adopting HTTP/2 and RESTful APIs as its primary signaling mechanism instead of traditional telecom protocols like Diameter and GTP-C. This means that network functions communicate with each other exactly like modern web microservices, using standard HTTP methods such as GET, POST, PUT, and DELETE to exchange structured JSON data. The decision transforms the mobile core from a closed telecom system into an open, cloud-native platform where software developers with web experience can build, deploy, and scale network services without deep telecom-specific protocol knowledge.