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API Gateway Implementation Guide

API Gateway Implementation Guide

API Gateway Implementation Guide

API Gateway Implementation Guide

API Gateway Implementation Guide

Introduction

An API gateway sits at the boundary between clients and backend services, handling cross-cutting concerns like authentication, rate limiting, routing, and observability. Choosing the right gateway and deployment pattern is critical for microservice architectures. This guide compares Kong, Tyk, and Apache APISIX across the dimensions that matter in production.

Gateway Comparison

Kong Gateway

Kong is built on OpenResty (NGINX + Lua) and offers enterprise features through a plugin ecosystem:

Kong declarative config (kong.yml)

_format_version: "3.0"

services:

\\\\- name: user-service

url: http://user-svc:8080

routes:

\\\\- name: user-routes

paths:

\\\\- /api/v1/users

methods: [GET, POST, PUT, DELETE]

strip_path: false

plugins:

\\\\- name: rate-limiting

config:

minute: 100

hour: 1000

policy: local

\\\\- name: key-auth

config:

key_names: ["X-API-Key"]

\\\\- name: cors

config:

origins: ["*"]

methods: ["GET", "POST", "PUT", "DELETE", "OPTIONS"]

Apache APISIX

APISIX provides sub-millisecond route matching via a radix tree and supports hot-reload of plugins:

APISIX Admin API

curl http://apisix:9180/apisix/admin/routes/1 -X PUT -d '

{

"uri": "/api/v1/orders/*",

"methods": ["GET", "POST"],

"upstream": {

"type": "roundrobin",

"nodes": {

"order-svc:8080": 1

}

},

"plugins": {

"limit-req": {

"rate": 10,

"burst": 20,

"rejected_code": 429

},

"jwt-auth": {

"header": "Authorization"

},

"prometheus": {}

}

}'

Tyk

Tyk offers a dashboard-centric approach with API definitions stored in Redis:

{

"name": "Payment API",

"api_id": "payment-api-v1",

"org_id": "default-org",

"proxy": {

"target_url": "http://payment-svc:8080",

"listen_path": "/api/v1/payments/",

"strip_listen_path": true

},

"version_data": {

"not_versioned": true

},

"auth": {

"auth_header_name": "Authorization"

},

"rate_limit": {

"rate": 100,

"per": 60

},

"enable_coprocess_auth": false

}

Routing Strategies

Gateways support multiple routing strategies critical for microservice decomposition:

\\\\-- Kong: complex route matching with regex

{

name = "complex-route",

paths = { "/api/v2/(users|orders|products)/?.*" },

hosts = { "api.example.com" },

methods = { "GET", "POST" },

protocols = { "https" },

priority = 100 -- Higher priority routes checked first

}

APISIX supports weight-based routing for canary deployments:

upstream:

type: weighted_upstream

nodes:

user-svc-v1:8080: 90

user-svc-v2:8080: 10

Rate Limiting and Throttling

Imp

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