Concepts

Which Lambda type?

This lab uses a Web FunctionWeb Function
Lambda compute type that runs a standard Node.js HTTP server listening on a port, with a built-in HTTPS endpoint and multi-concurrency per environment..

Type	Use when
Web Function	HTTP — Express, Hono, SSR, streaming
Event Function	Events — SQS, S3, EventBridge, streams
MicroVMs	Untrusted or isolated sandbox workloads

Three resources

A Web Function has revisions and endpoints:

• Web FunctionWeb Function
  Lambda compute type that runs a standard Node.js HTTP server listening on a port, with a built-in HTTPS endpoint and multi-concurrency per environment. wf-hello — the resource
• RevisionRevision
  Immutable snapshot of Web Function code and configuration. Progresses Pending → Active independently of the endpoint. — immutable code + config (Pending → Active)
• EndpointEndpoint
  HTTPS entry point for a Web Function. Has a domain, auth type, and routes traffic to one or two revisions. Types include HomeRegion, MultiRegion, and PerRegion. dev — HTTPS URL that routes to an Active revision

Traffic only when the endpoint and the revision are both Active.

Request path

Client → endpoint → environment → your server

Clientcurl / browser

HTTPS

EndpointTLS + auth

HTTP

Execution envmulti-concurrency

Your Node serverlisten on AWS_LAMBDA_HTTP_ENDPOINT

No API Gateway adapter. Each environment serves many concurrent requests. maxConcurrencyPerEnvironment (revision setting) bounds concurrency — range 1–128, default 64. See Scaling behavior for Lambda Web Functions.

Auth (this lab)

Application-managedPublic URL — your app authenticates

this lab

IamAuthSigV4 — not used in this lab