Скачать или смотреть OpenFeign Client Explained: REST Communication for Spring Boot Microservices

00:00 – Intro: Simplest & Most Elegant Microservice Communication
00:02 – Why Customer Service Must Call AuthUser Service
00:10 – After KYC: Creating Credentials in Auth0
00:23 – Establishing Synchronous Communication
00:30 – Using Feign (Declarative HTTP Client)
00:33 – What Feign Is & Why It’s Powerful

00:39 – Back to Customer Microservice (Controller)
00:43 – updateKycStatus Endpoint Overview
00:54 – Service Layer Handles KYC Update Logic

01:03 – Verified KYC → Trigger AuthUser Service Call
01:16 – Feign Interface Declaration (OServiceClient)
01:19 – “Hey Feign, call this endpoint when I call this method”
01:24 – Feign Generates the REST Call Automatically

01:45 – Service Creates Request Object
01:49 – Calling oServiceClient.registerCustomer()

02:00 – What Happens Behind the Scenes
02:02 – Java Object → JSON Payload
02:06 – Headers Attached Automatically
02:10 – HTTP Call Sent to AuthUser `/users` Endpoint
02:13 – AuthUser Service Processes & Creates User in Auth0

02:22 – Customer Service Thinks It’s a Simple Method Call
02:25 – But It’s Actually a Full HTTP Exchange Under the Hood

02:34 – Enabling Feign in the Application
02:37 – Feign Dependency Added in commons-security BOM
02:48 – Adding @EnableFeignClients in CustomerServiceApplication

02:55 – Next Video: Implementing the End-to-End Flow in Postman
02:57 – Outro



In this video, we explore how two Spring Boot microservices communicate with each other using Feign —
a declarative HTTP client that makes inter-service calls simple and elegant.

You’ll learn:
✅ How CustomerService calls AuthUserService after KYC completion
✅ How Feign converts Java method calls into real HTTP requests
✅ How JWT tokens and headers are automatically passed between services
✅ How this pattern fits into our digital bank architecture

Real example:
CustomerService → AuthUserService → Auth0 user creation flow

#SpringBoot #Microservices #FeignClient #Auth0 #BankStack #Java #BackendDevelopment