Lambda + api gateway + CF = serve zip

.gitignore

# package directories
node_modules
jspm_packages

# Serverless directories
.serverless

README.md

Lambda + api gateway + CF = serve zip

handler.js

'use strict';
const path = require('path');

module.exports.hello = async event => {
  try {
    const fs = require('fs');
    const fileContents = await new Promise((res, rej) => {
      fs.readFile(path.resolve(__dirname, 'thiswillbezipcontent.txt.zip'), (err, data) => {
        if (err) {
          rej(err)
        } else {
          res(data)
        }
      });
    });

    return {
      statusCode: 200,
      body: fileContents.toString('base64'),
      headers: {
        'Content-Type': 'application/zip'
      },
      isBase64Encoded: true
    };
  } catch (e) {
    return {
      statusCode: 200,
      body: `can't read: ${e.message}`,
    }
  }
};

serverless.yml

service: serve-zip-file
frameworkVersion: '2'

provider:
  name: aws
  runtime: nodejs12.x

  apiGateway:
    binaryMediaTypes:
      - '*/*'

functions:
  hello:
    handler: handler.hello
    events:
      - http:
          path: hello
          method: get