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.pathParameterUsedAsPath = options.pathParameterUsedAsPath !== undefined ? options.pathParameterUsedAsPath : 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 = (options.pathParameterUsedAsPath && event.pathParameters && event.pathParameters[options.pathParameterUsedAsPath] && `/${event.pathParameters[options.pathParameterUsedAsPath]}`) || 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(';')

      if (event.requestContext.http && event.requestContext.http.sourceIp) {

        remoteAddress = event.requestContext.http.sourceIp

      } else if (event.requestContext.identity && event.requestContext.identity.sourceIp) {

        remoteAddress = event.requestContext.identity.sourceIp

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

      app.inject({ method, url, query, payload, headers }, (err, res) => {

      app.inject({ method, url, query, payload, headers, remoteAddress }, (err, res) => {

        // chunked transfer not currently supported by API Gateway

        if (headers['transfer-encoding'] === 'chunked') delete headers['transfer-encoding']

        if (headers['Transfer-Encoding'] === 'chunked') delete headers['Transfer-Encoding']

        Object.keys(res.headers).forEach((h) => {

          const isSetCookie = h.toLowerCase() === 'set-cookie'

          const isArraycookie = Array.isArray(res.headers[h])

              multiValueHeaders = multiValueHeaders || {}

              multiValueHeaders[h] = res.headers[h]

            } else res.headers[h] = res.headers[h].join(',')

          } else if (typeof res.headers[h] !== 'undefined' && typeof res.headers[h] !== 'string') {

            // NOTE: API Gateway (i.e. HttpApi) validates all headers to be a string

            res.headers[h] = res.headers[h].toString()

            cookies = isArraycookie ? res.headers[h] : [res.headers[h]]

            if (event.version === '2.0' || isArraycookie) delete res.headers[h]

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

		@@ -29,3 +29,3 @@ {
		"license": "MIT",
		"version": "3.4.2",
		"version": "3.5.0",
		"main": "index.js",
		@@ -46,3 +46,3 @@ "type": "commonjs",
		"@fastify/pre-commit": "^2.0.2",
		"@types/aws-lambda": "8.10.125",
		"@types/aws-lambda": "8.10.126",
		"aws-lambda": "^1.0.7",
		@@ -49,0 +49,0 @@ "aws-serverless-express": "^3.4.0",

		@@ -101,4 +101,13 @@ 'use strict'

		let remoteAddress
		if (event.requestContext) {
		if (event.requestContext.http && event.requestContext.http.sourceIp) {
		remoteAddress = event.requestContext.http.sourceIp
		} else if (event.requestContext.identity && event.requestContext.identity.sourceIp) {
		remoteAddress = event.requestContext.identity.sourceIp
		}
		}

		const prom = new Promise((resolve) => {
		app.inject({ method, url, query, payload, headers }, (err, res) => {
		app.inject({ method, url, query, payload, headers, remoteAddress }, (err, res) => {
		currentAwsArguments = {}
		@@ -105,0 +114,0 @@ if (err) {

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