Example of how to make a request to AWS's API using raw HTTP request in Node.JS

AWSRawRequest.js

'use strict';

let crypto        = require( 'crypto' ),
    request       = require( 'request' ),
    qstr          = require( 'querystring' ),
    keys          = Object.keys,
    signString    = ( method, endpoint, uri, qs ) => `${method}\n${endpoint}\n${uri}\n${qs}`,
    makeString    = ( ...args ) => args.join( '' ),
    generateHmac  = ( signedData, awsSecretKey )  => crypto.createHmac( 'sha256', awsSecretKey ).update( signedData ).digest( 'base64' ),
    urlEncode     = o => keys( o ).reduce( ( r, k ) => ( r[ encodeURIComponent( k ) ] = encodeURIComponent( o[ k ] ), r ), {} ),
    sortObject    = o => keys( o ).sort().reduce( ( r, k ) => ( r[ k ] = o[ k ], r ), {} );

const
    ts      = new Date(),
    AWSKeys = {
        kAccess: 'AWS_ACCESS_KEY',
        kSecret: 'AWS_SECRET_KEY'
    },
    options = {
        method: 'GET',
        url: 'webservices.amazon.com',
        path: '/onca/xml',
        qs: {
            Service: 'AWSECommerceService',
            Operation: 'ItemSearch',
            AWSAccessKeyId: AWSKeys.kAccess,
            AssociateTag: 'tag-20',
            SearchIndex: 'Appliances',
            Keywords: 'games',
            ResponseGroup: 'SalesRank',
            Sort: 'salesrank',
            Timestamp: ts.toISOString().split( '.' )[ 0 ] + '.000Z'
        }
    };

function makeRequest( opt ) {
    let qstring = opt.qs, signed, reqURL;

    qstring = sortObject( qstring );
    qstring = qstr.stringify( qstring );
    signed  = '&Signature=' + generateHmac( signString( opt.method, opt.url, opt.path, qstring ), AWSKeys.kSecret );
    qstring += signed;

    console.log( qstring );

    reqURL = makeString( 'http://', opt.url, opt.path, '?', qstring );
    console.log( reqURL );

    request( reqURL, ( error, response, body ) => {
        if ( !error && response.statusCode === 200 ) {
            console.log( body );
        } else {
            console.log( body );
        }
    } );
}


makeRequest( options );