api-a.js

'use strict';

const co         = require('co');
const log        = require('../lib/log');
const http       = require('../lib/http');
const apiHandler = require('../lib/apiHandler');
const reqContext = require('../lib/requestContext');

module.exports.handler = apiHandler(
  co.wrap(function* (event, context) {
    reqContext.set("character-a", "tywin");

    log.debug("this is a DEBUG log");
    log.info("this is an INFO log");
    log.warn("this is a WARNING log");
    log.error("this is an ERROR log");
    
    // do a bunch of stuff, like calling another HTTP endpoint
    let host = event.headers.Host;
    reqContext.set("host", host);
    let uri  = `https://${host}/dev/api-b`;

    log.info("calling api-b", { uri });

    let reply = yield http({
      uri     : uri,
      method  : 'GET'
    });
    
    ...
    
    return {
      message: 'A Lannister always pays his debts'
    };
  })
);