API Gateway HTTP API versus ALB WebSocket

08 Dec 2021

Learn how API Gateway HTTP API differs from ALB WebSocket.

API Gateway HTTP API ALB WebSocket
Type

REST API

Websocket

HTTPS/TLS

Backends

✅ Lambda
✅ Public endpoint
✅ Private endpoint
⚠️ AWS Service APIs

❌ Lambda
❌ Public endpoint
✅ Private endpoint
❌ AWS Service APIs

Costs

💰

💰💰

Maturity

⭐️⭐️

⭐️⭐️⭐️⭐️

Authentication

✅ IAM
❌ API Key
✅ OpenID Connect
❌ SAML
❌ Social
✅ Custom

❌ IAM
❌ API Key
✅ OpenID Connect
✅ SAML
✅ Social
❌ Custom

Tenant-based Throttling

Request Validation

Req./Res. Transformation

Endpoints

✅ Public
❌ Private

✅ Public
✅ Private

WAF