Inspired by aws-serverless-express to work with Fastify with inject functionality. 

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  const contentEncoding = res.headers['content-encoding'] || res.headers['Content-Encoding']

  return contentEncoding && contentEncoding !== 'identity'

const customBinaryCheck = (options, res) => {

  const enforceBase64 = typeof options.enforceBase64 === 'function' ? options.enforceBase64 : isCompressedDefault

  options.binaryMimeTypes = options.binaryMimeTypes || []

  options.serializeLambdaArguments = options.serializeLambdaArguments !== undefined ? options.serializeLambdaArguments : false

  options.decorateRequest = options.decorateRequest !== undefined ? options.decorateRequest : true

  options.retainStage = options.retainStage !== undefined ? options.retainStage : false

    options.decorationPropertyName = options.decorationPropertyName || 'awsLambda'

    app.decorateRequest(options.decorationPropertyName, {

          return currentAwsArguments.event

          return currentAwsArguments.context

    currentAwsArguments.context = context

    if (options.callbackWaitsForEmptyEventLoop !== undefined) {

      context.callbackWaitsForEmptyEventLoop = options.callbackWaitsForEmptyEventLoop

    const method = event.httpMethod || (event.requestContext && event.requestContext.http ? event.requestContext.http.method : undefined)

    let url = event.path || event.rawPath || '/' // seen rawPath for HTTP-API

    // NOTE: if used directly via API Gateway domain and /stage

    if (!options.retainStage && event.requestContext && event.requestContext.stage &&

        event.requestContext.resourcePath && (url).indexOf(`/${event.requestContext.stage}/`) === 0 &&

        event.requestContext.resourcePath.indexOf(`/${event.requestContext.stage}/`) !== 0) {

      url = url.substring(event.requestContext.stage.length + 1)

    if (event.requestContext && event.requestContext.elb) {

      if (event.multiValueQueryStringParameters) {

        Object.keys(event.multiValueQueryStringParameters).forEach((q) => {

          query[decodeURIComponent(q)] = event.multiValueQueryStringParameters[q].map((val) => decodeURIComponent(val))

      } else if (event.queryStringParameters) {

        Object.keys(event.queryStringParameters).forEach((q) => {

          query[decodeURIComponent(q)] = decodeURIComponent(event.queryStringParameters[q])

          if (event.version === '2.0' && typeof query[decodeURIComponent(q)] === 'string' && query[decodeURIComponent(q)].indexOf(',') > 0) {

            query[decodeURIComponent(q)] = query[decodeURIComponent(q)].split(',')

      if (event.queryStringParameters && event.version === '2.0') {

        Object.keys(event.queryStringParameters).forEach((k) => {

          if (typeof event.queryStringParameters[k] === 'string' && event.queryStringParameters[k].indexOf(',') > 0) {

            event.queryStringParameters[k] = event.queryStringParameters[k].split(',')

      Object.assign(query, event.multiValueQueryStringParameters || event.queryStringParameters)

    const headers = Object.assign({}, event.headers)

      Object.keys(event.multiValueHeaders).forEach((h) => {

        if (event.multiValueHeaders[h].length > 1) {

          headers[h] = event.multiValueHeaders[h]

    const payload = Buffer.from(event.body, event.isBase64Encoded ? 'base64' : 'utf8')

    // NOTE: API Gateway is not setting Content-Length header on requests even when they have a body

    if (event.body && !headers['Content-Length'] && !headers['content-length']) headers['content-length'] = Buffer.byteLength(payload)

    if (options.serializeLambdaArguments) {

      event.body = undefined // remove body from event only when setting request headers

      headers['x-apigateway-event'] = encodeURIComponent(JSON.stringify(event))

      if (context) headers['x-apigateway-context'] = encodeURIComponent(JSON.stringify(context))

    if (event.requestContext && event.requestContext.requestId) {

      headers['x-request-id'] = headers['x-request-id'] || event.requestContext.requestId

    // API gateway v2 cookies: https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html

    if (event.cookies && event.cookies.length) {

      headers.cookie = event.cookies.join(';')

    const prom = new Promise((resolve) => {

        const contentType = (res.headers['content-type'] || res.headers['Content-Type'] || '').split(';')[0]

        const contentType = (res.headers['content-type'] || res.headers['Content-Type'] || '').split(';', 1)[0]

        const isBase64Encoded = options.binaryMimeTypes.indexOf(contentType) > -1 || customBinaryCheck(options, res)

          body: isBase64Encoded ? res.rawPayload.toString('base64') : res.payload,

        if (cookies && event.version === '2.0') ret.cookies = cookies

        if (multiValueHeaders && (!event.version || event.version === '1.0')) ret.multiValueHeaders = multiValueHeaders

    prom.then((ret) => callback(null, ret)).catch(callback)

module.exports.awsLambdaFastify = module.exports

  "description": "Inspired by aws-serverless-express to work with Fastify with inject functionality.",

  "homepage": "https://github.com/fastify/aws-lambda-fastify",

  "author": "Adriano Raiano <adriano@raiano.ch>",

    "url": "git@github.com:fastify/aws-lambda-fastify.git"

    "url": "https://github.com/fastify/aws-lambda-fastify/issues"

    "test": "npm run test:unit && npm run test:typescript",

    "test:unit": "tap -J -R specy --no-coverage test/*test.js",

    "performance": "npm run lint && node performanceTest/test"

    "performance": "npm run lint && node performanceTest/test",

    "preversion": "npm run test && git push",

    "postversion": "git push && git push --tags"

		@@ -29,4 +29,5 @@ {
		"license": "MIT",
		"version": "3.3.0",
		"version": "3.3.1",
		"main": "index.js",
		"type": "commonjs",
		"types": "types/index.d.ts",
		@@ -38,26 +39,28 @@ "scripts": {
		"test:typescript": "tsd",
		"performance": "npm run lint && node performanceTest/test"
		"performance": "npm run lint && node performanceTest/test",
		"preversion": "npm run test && git push",
		"postversion": "git push && git push --tags"
		},
		"devDependencies": {
		"@fastify/multipart": "7.6.1",
		"@fastify/multipart": "8.0.0",
		"@fastify/pre-commit": "^2.0.2",
		"@types/aws-lambda": "8.10.119",
		"@types/aws-lambda": "8.10.125",
		"aws-lambda": "^1.0.7",
		"aws-serverless-express": "^3.4.0",
		"aws-serverless-fastify": "^3.0.2",
		"aws-serverless-fastify": "^3.0.4",
		"benchmark": "^2.1.4",
		"eslint": "^8.31.0",
		"eslint-config-standard": "^17.0.0",
		"eslint-plugin-import": "^2.27.4",
		"eslint-plugin-n": "^15.6.1",
		"eslint": "^8.52.0",
		"eslint-config-standard": "^17.1.0",
		"eslint-plugin-import": "^2.29.0",
		"eslint-plugin-n": "^16.2.0",
		"eslint-plugin-promise": "^6.1.1",
		"eslint-plugin-standard": "^5.0.0",
		"fastify": "^4.11.0",
		"serverless-http": "^3.1.1",
		"tap": "^16.3.3",
		"tsd": "^0.28.0"
		"fastify": "^4.24.3",
		"serverless-http": "^3.2.0",
		"tap": "^16.3.9",
		"tsd": "^0.29.0"
		},
		"overrides": {
		"aws-serverless-fastify": {
		"fastify": "^4.11.0"
		"fastify": "^4.24.3"
		}
		@@ -64,0 +67,0 @@ },

		@@ -135,3 +135,3 @@ 'use strict'

		const contentType = (res.headers['content-type'] \|\| res.headers['Content-Type'] \|\| '').split(';')[0]
		const contentType = (res.headers['content-type'] \|\| res.headers['Content-Type'] \|\| '').split(';', 1)[0]
		const isBase64Encoded = options.binaryMimeTypes.indexOf(contentType) > -1 \|\| customBinaryCheck(options, res)
		@@ -138,0 +138,0 @@

Improved metrics