HTTP request not working with AWS Lambda please help

Question

I've been trying to run the following code, but unable to do so, please some one help.

var http = require('http');

exports.handler = function(event, context) {
  console.log('start request to ' + event.url)
  http.get(event.url, function(res) {
    console.log("Got response: " + res.statusCode);
    context.succeed();
  }).on('error', function(e) {
    console.log("Got error: " + e.message);
    context.done(null, 'FAILURE');
  });

  console.log('end request to ' + event.url);
}

Answer 1

context.done has to be included after the callbacks for request. Once context.done is called the function therefore causing your code to not function.

Here is the working code,

var http = require('http');

exports.handler = function(event, context) {
  console.log('start request to ' + event.url)
  http.get(event.url, function(res) {
    console.log("Got response: " + res.statusCode);
    context.succeed();
  }).on('error', function(e) {
    console.log("Got error: " + e.message);
    context.done(null, 'FAILURE');
  });

  console.log('end request to ' + event.url);
}

Update: starting 2017 the old Nodejs 0.10 has been deprecated by AWS and only the newer 4.3 run-time is now available (old functions should be updated). This runtime introduced some changes to the handler function. The new handler has now 3 parameters.

function(event, context, callback)

Answer 2

I'm using the async utility module, which is easier to understand for newbies. You'll need to push that to your AWS Stack to use it (I recommend the serverless framework).

Note that the data comes back in chunks, which are gathered in a global variable, and finally the callback is called when the data has ended.

'use strict';

const async = require('async');
const https = require('https');

module.exports.handler = function (event, context, callback) {

    let body = "";
    let countChunks = 0;

    async.waterfall([
        requestDataFromFeed,
        // processBody,
    ], (err, result) => {
        if (err) {
            console.log(err);
            callback(err);
        }
        else {
            const message = "Success";
            console.log(result.body);
            callback(null, message);
        }
    });

    function requestDataFromFeed(callback) {
        const url = 'https://put-your-feed-here.com';
        console.log(`Sending GET request to ${url}`);
        https.get(url, (response) => {
            console.log('statusCode:', response.statusCode);
            response.on('data', (chunk) => {
                countChunks++;
                body += chunk;
            });
            response.on('end', () => {
                const result = {
                    countChunks: countChunks,
                    body: body
                };
                callback(null, result);
            });
        }).on('error', (err) => {
            console.log(err);
            callback(err);
        });
    }
};

Answer 3

Try this it works

var http = require('http');

exports.handler = function(event, context) {
  console.log('start request to ' + event.url)
  http.get(event.url, function(res) {
    console.log("Got response: " + res.statusCode);
    context.succeed();
  }).on('error', function(e) {
    console.log("Got error: " + e.message);
    context.done(null, 'FAILURE');
  });

  console.log('end request to ' + event.url);
}

Answer 4

You can use this code

const http = require('http');
exports.handler = async (event, context) => {
    return new Promise((resolve, reject) => {
        const options = {
            host: 'ec2-18-191-89-162.us-east-2.compute.amazonaws.com',
            path: '/api/repos/r1639420d605/index?delta=true&clear=false',
            port: 8000,
            method: 'PUT'
        };
        const req = http.request(options, (res) => {
          resolve('Success');
        });
        req.on('error', (e) => {
          reject(e.message);
        });
        // send the request
        req.write('');
        req.end();
    });
};

Answer 5

Read this article to get a brief example of how to request http with aws lambda function

https://dev.to/scottlepp/http-request-with-aws-lambda-nodejs-810-and-standard-http-library-2cee

Answer 6

The newer version of NodeJS doesn't support the previous function statement

use this instead 

function(event, context, callback)

Answer 7

I think that this might be caused due to a missing user-agent in your HTTP request.

Answer 8

See how to configure your lambda fucntion https://docs.aws.amazon.com/lambda/latest/dg/vpc.html

Answer 9

I found this code and it helped me

var http = require('http');
exports.myhandler = function(event, context) {
    console.log('start request to ' + event.url)
    http.get(event.url, function(res) {
        console.log("Got response: " + res.statusCode);
        context.succeed();
    }).on('error', function(e) {
        console.log("Got error: " + e.message);
        context.done(null, 'FAILURE');
    });
    console.log('end request to ' + event.url); 
}

Answer 10

have a look at the Serverless nodejs framework when you want to develop locally then deploy to AWS, will make your workflow much easier