feat(undici-http-handler): add HttpHandler backed by Node.js undici

.changeset/pink-mangos-relate.md

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+---
+"@smithy/undici-http-handler": major
+---
+
+Add HttpHandler backed by Node.js undici

api-snapshot/api.json

@@ -1321,6 +1321,10 @@
     "WaiterConfiguration": "type(interface)",
     "WithSdkStreamMixin": "type(object)"
   },
+  "@smithy/undici-http-handler": {
+    "UndiciHttpHandler": "function",
+    "UndiciHttpHandlerOptions": "type(interface)"
+  },
   "@smithy/url-parser": {
     "parseUrl": "function"
   },

packages/undici-http-handler/.gitignore

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+/node_modules/
+/build/
+/coverage/
+/docs/
+*.tsbuildinfo
+*.tgz
+*.log
+package-lock.json

packages/undici-http-handler/CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+See [@smithy/undici-http-handler](https://github.com/smithy/smithy-typescript/blob/main/packages/undici-http-handler/CHANGELOG.md) for additional history.

packages/undici-http-handler/LICENSE

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packages/undici-http-handler/README.md

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+# @smithy/undici-http-handler
+
+[![NPM version](https://img.shields.io/npm/v/@smithy/undici-http-handler/latest.svg)](https://www.npmjs.com/package/@smithy/undici-http-handler)
+[![NPM downloads](https://img.shields.io/npm/dm/@smithy/undici-http-handler.svg)](https://www.npmjs.com/package/@smithy/undici-http-handler)
+
+Smithy-compatible HTTP handler backed by Node.js [undici][].
+
+## Usage
+
+Use `UndiciHttpHandler` as a Smithy-compatible request handler for generated
+clients. It uses undici for HTTP transport, and accepts optional undici
+`Dispatcher` to set up transport details.
+
+### Basic example
+
+```js
+import { S3 } from "@aws-sdk/client-s3";
+import { UndiciHttpHandler } from "@smithy/undici-http-handler";
+
+const client = new S3({
+  requestHandler: new UndiciHttpHandler(),
+});
+
+client.listBuckets().then(console.log);
+```
+
+### Configuring undici Dispatcher
+
+Pass an undici `Dispatcher` to configure transport behavior such as connection
+pooling and timeouts.
+
+```js
+import { S3 } from "@aws-sdk/client-s3";
+import { UndiciHttpHandler } from "@smithy/undici-http-handler";
+import { Agent } from "undici";
+
+const dispatcher = new Agent({
+  connections: 50,
+  headersTimeout: 3000,
+  bodyTimeout: 3000,
+  connect: {
+    timeout: 3000,
+  },
+});
+
+const client = new S3({
+  requestHandler: new UndiciHttpHandler({ dispatcher }),
+});
+
+client.listBuckets().then(console.log);
+```
+
+## Benchmarks
+
+Our benchmark spin up a local HTTP server and runs two scenarios:
+
+- **10 sequential GETs** – measures per-request latency when requests are issued
+  one after another.
+- **50 concurrent GETs** – measures throughput under parallel load using
+  `Promise.all`.
+
+The results show UndiciHttpHandler spends **20%-30%** less time in request handling
+as compared to NodeHttpHandler from `@smithy/node-http-handler`.
+
+We recommend running benchmarks for your own use case on your own setup, as
+results will vary depending on workload, network conditions, and environment.
+
+[undici]: https://undici.nodejs.org/

packages/undici-http-handler/api-extractor.json

@@ -0,0 +1,4 @@
+{
+  "extends": "../../api-extractor.packages.json",
+  "mainEntryPointFilePath": "./dist-types/index.d.ts"
+}

packages/undici-http-handler/package.json

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+{
+  "name": "@smithy/undici-http-handler",
+  "version": "0.5.0",
+  "description": "Smithy-compatible HTTP handler backed by Node.js undici",
+  "scripts": {
+    "build": "concurrently 'yarn:build:types' 'yarn:build:es:cjs'",
+    "build:es:cjs": "yarn g:tsc -p tsconfig.es.json && node ../../scripts/inline undici-http-handler",
+    "build:types": "yarn g:tsc -p tsconfig.types.json",
+    "build:types:downlevel": "premove dist-types/ts3.4 && downlevel-dts dist-types dist-types/ts3.4",
+    "clean": "premove dist-cjs dist-es dist-types tsconfig.cjs.tsbuildinfo tsconfig.es.tsbuildinfo tsconfig.types.tsbuildinfo",
+    "extract:docs": "api-extractor run --local",
+    "format": "prettier --config ../../prettier.config.js --ignore-path ../../.prettierignore --write \"**/*.{ts,md,json}\"",
+    "lint": "eslint -c ../../.eslintrc.js \"src/**/*.ts\"",
+    "stage-release": "premove .release && yarn pack && mkdir ./.release && tar zxvf ./package.tgz --directory ./.release && rm ./package.tgz",
+    "test": "yarn g:vitest run",
+    "test:bench": "yarn g:vitest bench --config vitest.config.bench.mts",
+    "test:watch": "yarn g:vitest watch"
+  },
+  "author": {
+    "name": "AWS SDK for JavaScript Team",
+    "email": "",
+    "url": "https://aws.amazon.com/javascript/"
+  },
+  "license": "Apache-2.0",
+  "sideEffects": false,
+  "main": "./dist-cjs/index.js",
+  "module": "./dist-es/index.js",
+  "types": "./dist-types/index.d.ts",
+  "dependencies": {
+    "@smithy/core": "workspace:^",
+    "@smithy/types": "workspace:^",
+    "tslib": "^2.6.2",
+    "undici": "^6.0.0"
+  },
+  "devDependencies": {
+    "@smithy/abort-controller": "workspace:^",
+    "@smithy/node-http-handler": "workspace:^",
+    "@types/node": "^18.11.9",
+    "concurrently": "7.0.0",
+    "downlevel-dts": "0.10.1",
+    "premove": "4.0.0",
+    "typedoc": "0.23.23"
+  },
+  "peerDependencies": {
+    "undici": "^6.0.0"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  },
+  "typesVersions": {
+    "<4.5": {
+      "dist-types/*": [
+        "dist-types/ts3.4/*"
+      ]
+    }
+  },
+  "files": [
+    "dist-*/**"
+  ],
+  "homepage": "https://github.com/smithy-lang/smithy-typescript/tree/main/packages/undici-http-handler",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/smithy-lang/smithy-typescript.git",
+    "directory": "packages/undici-http-handler"
+  },
+  "typedoc": {
+    "entryPoint": "src/index.ts"
+  },
+  "publishConfig": {
+    "directory": ".release/package"
+  }
+}

packages/undici-http-handler/src/index.ts

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+export { UndiciHttpHandler } from "./undici-http-handler";
+export type { UndiciHttpHandlerOptions } from "./undici-http-handler";