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Node.js Backend Development Bootcamp · 강의

API 게이트웨이 구현

마이크로서비스에 대한 클라이언트 요청의 단일 진입점 역할을 하는 API 게이트웨이를 설계하고 설정합니다.

API 게이트웨이 구현은(는) CoddyKit의 무료 Node.js Backend Development Bootcamp 강의입니다. 이것은 4개 중 3번째 강의입니다. 아래에서 전체 강의를 무료로 읽을 수 있으며, 내장 코드 에디터와 24/7 AI 튜터와 함께 브라우저에서 직접 실습할 수 있습니다. 이 강의는 Node.js Backend Development Bootcamp 학습 경로의 일부이며, 진행 상황이 웹과 CoddyKit 앱에 동기화됩니다. Node.js Backend Development Bootcamp 강의에는 총 4개의 강의가 포함되어 있습니다.

이 강의의 일부는 아직 번역되지 않았으며 영어로 표시됩니다.

API Gateway: The Front Door

In a microservices architecture, clients often need to interact with many different services. An API Gateway acts as a single, unified entry point for all client requests.

Think of it as the front desk of a large hotel. Instead of guests having to find specific rooms (microservices) themselves, they go to the front desk which directs them to the right place and handles common requests.

API 게이트웨이 구현 — 일러스트레이션 1

Why Use an API Gateway?

API Gateways solve several challenges that arise when using microservices:

  • Simplifies Clients: Clients only need to know one endpoint (the gateway) instead of many microservice URLs.
  • Request Routing: Directs incoming requests to the correct backend service.
  • Common Concerns: Handles cross-cutting concerns like authentication, rate limiting, and logging at a single point.
  • Service Aggregation: Can combine responses from multiple services into a single client-friendly response.

Gateway vs. Load Balancer

It's easy to confuse an API Gateway with a Load Balancer, but they serve different purposes:

  • Load Balancer: Operates at the network layer (Layer 4) or application layer (Layer 7) to distribute traffic across multiple instances of the same service for high availability and performance.
  • API Gateway: Operates at the application layer (Layer 7) and focuses on API-specific concerns. It routes requests to different services and can perform transformations or security checks.

They often work together, with a load balancer sitting in front of the API Gateway.

Key Responsibilities of a Gateway

An API Gateway takes on several crucial roles:

  • Request Routing: Mapping specific API paths (e.g., /users) to the appropriate microservice.
  • Authentication & Authorization: Verifying user identity and permissions before forwarding requests.
  • Rate Limiting: Controlling the number of requests a client can make within a certain timeframe.
  • Caching: Storing frequently accessed data to reduce load on backend services and improve response times.
  • Logging & Monitoring: Centralizing logs for all incoming requests and outgoing responses.

Building a Simple Gateway

You can build a custom API Gateway using Node.js and frameworks like Express.js. A popular library for proxying HTTP requests in Express is http-proxy-middleware.

This library makes it easy to forward requests from your gateway to your backend microservices, acting as a reverse proxy.

Basic Proxy Setup

Let's set up a simple Express.js server that acts as a proxy. This gateway will listen on port 3000 and forward all requests starting with /api to a mock 'users' microservice on port 3001.

Remember, for full functionality, you'd need an actual microservice running at http://localhost:3001.

const express = require('express');
const { createProxyMiddleware } = require('http-proxy-middleware');

const app = express();
const GATEWAY_PORT = 3000;

// Proxy all requests starting with /api to the users microservice
app.use(
  '/api',
  createProxyMiddleware({
    target: 'http://localhost:3001', // Target URL of your users microservice
    changeOrigin: true, // Needed for virtual hosted sites
    logLevel: 'debug' // Optional: for seeing proxy activity in console
  })
);

// Simple root route for gateway status
app.get('/', (req, res) => {
  res.send('API Gateway is running. Try /api/users (if microservice is active).');
});

app.listen(GATEWAY_PORT, () => {
  console.log(`API Gateway listening on port ${GATEWAY_PORT}`);
  console.log('Proxying /api to http://localhost:3001');
});

Routing to Multiple Services

The power of an API Gateway comes from its ability to route requests to different microservices based on the request path, HTTP method, or other criteria.

You can define multiple proxy rules, each pointing to a different backend service. For example, /users goes to the user service, and /products goes to the product service.

Multi-Service Routing Example

Here, we extend our gateway to route requests for /users to a 'users-service' on port 3001 and requests for /products to a 'products-service' on port 3002.

The pathRewrite option is important: it removes the path prefix (e.g., /users) before forwarding the request to the target service.

const express = require('express');
const { createProxyMiddleware } = require('http-proxy-middleware');

const app = express();
const GATEWAY_PORT = 3000;

// Proxy for user-related requests
app.use(
  '/users',
  createProxyMiddleware({
    target: 'http://localhost:3001', // Users Microservice URL
    changeOrigin: true,
    pathRewrite: { '^/users': '' }, // Remove /users prefix
    logLevel: 'debug'
  })
);

// Proxy for product-related requests
app.use(
  '/products',
  createProxyMiddleware({
    target: 'http://localhost:3002', // Products Microservice URL
    changeOrigin: true,
    pathRewrite: { '^/products': '' }, // Remove /products prefix
    logLevel: 'debug'
  })
);

app.get('/', (req, res) => {
  res.send('API Gateway is running. Try /users or /products (if microservices are active).');
});

app.listen(GATEWAY_PORT, () => {
  console.log(`API Gateway listening on port ${GATEWAY_PORT}`);
  console.log('Proxying /users to http://localhost:3001');
  console.log('Proxying /products to http://localhost:3002');
});

Centralized Middleware for Gateway

One of the biggest advantages of an API Gateway is applying middleware for common concerns before requests even reach your microservices.

You can implement Express middleware functions globally or for specific routes within your gateway to handle tasks like:

  • Authentication: Verify JWTs or session tokens.
  • Logging: Log every incoming request.
  • Rate Limiting: Prevent abuse by limiting request frequency.
  • Input Validation: Basic validation before forwarding.

Quick Check on Gateway

An API Gateway serves as a crucial component in a microservices setup. Let's test your understanding of its primary purpose.

Gateway Summary

You've learned about API Gateways, their importance in microservices, and how to implement a basic one using Express.js and http-proxy-middleware.

Key takeaways:

  • API Gateways simplify client interactions by providing a single entry point.
  • They handle routing, authentication, rate limiting, and other cross-cutting concerns.
  • Express.js with http-proxy-middleware is a flexible way to build custom gateways.

Mastering API Gateways is essential for building robust and scalable microservices!

자주 묻는 질문

“API 게이트웨이 구현” 강의는 무료인가요?

네 — “API 게이트웨이 구현” 전체 내용을 이 웹사이트에서 무료로 읽을 수 있습니다. 인터랙티브하게 실습하려면(내장 코드 에디터와 24/7 AI 튜터), CoddyKit PRO로 업그레이드하면 Node.js Backend Development Bootcamp 강의 전체를 잠금 해제할 수 있습니다. Node.js Backend Development Bootcamp 강의에는 총 4개의 강의가 포함되어 있습니다.

“API 게이트웨이 구현”에서 뭘 배우나요?

마이크로서비스에 대한 클라이언트 요청의 단일 진입점 역할을 하는 API 게이트웨이를 설계하고 설정합니다. 브라우저에서 직접 실행하는 실습 코드로 Node.js Backend Development Bootcamp을(를) 배우며, 24/7 AI 튜터가 강의를 진행하면서 질문에 답변해줍니다.

Node.js Backend Development Bootcamp을(를) 시작하는 데 경험이 필요한가요?

사전 경험은 필요하지 않습니다. CoddyKit의 Node.js Backend Development Bootcamp은(는) 초급자부터 고급 학습자까지를 위해 구성되어 있으므로, 여기서 시작하거나 처음부터 시작할 수 있으며 자신의 속도대로 진행할 수 있습니다. 이것은 4개 중 3번째 강의입니다.

“API 게이트웨이 구현” 강의는 얼마나 걸리나요?

대부분의 CoddyKit 강의는 약 5~10분이 소요됩니다. 각 강의는 간결하고 인터랙티브하여 꾸준한 진행이 가능하며, 웹과 앱에서 중단한 부분부터 바로 시작할 수 있습니다.

이 Node.js Backend Development Bootcamp 강의에서 코드를 작성하고 실행할 수 있나요?

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이 강의의 모든 강의

  1. 마이크로서비스 아키텍처 소개
  2. Node.js 마이크로서비스 개발
  3. API 게이트웨이 구현
  4. 메시지 큐를 활용한 서비스 간 통신
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