Making simple HTTP requests in NodeJS

Published at

8/8/2021

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Author

11 person written this

vishalraj82

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Of course, there are numerous npm packages available to make HTTP requests. Just to name a few, you can use

many more. These all are super fantastic libraries which bring in array of capabilities on how to make HTTP request and handle various responses and errors.

But sometimes, all we need is, a simple HTTP/S request and response handler. This can be easily done with NodeJS's built-in packages http / https with a very simple lean piece of code. Lets see it in action.

NOTE: Since Promise is fancy, so I am gonna use it for this.

// SimpleHttp.js

const { URL } = require('url'),
    http = require('http'),
    https = require('https');

/**
 * Simple function to make HTTP / HTTPS request.
 *
 * @param {String} url The url to be scraped
 * @param {Object} config The configuration object to make HTTP request
 *
 * @return {Promise}
 */
module.exports = function fetch (url, config = {}) {
    const u = new URL(url),
        secure = 'https:' === u.protocol,
        handler = secure ? https : http,
        options = {
            method: config.method || 'GET',
            host: u.hostname,
            port: u.port || (secure ? 443 : 80),
            path: u.pathname,
            query: config.query || {},
        },
        isHeadRequest = 'HEAD' === options.method;

    return new Promise((resolve, reject) => {
        const request = handler.request(options, function (response) {
            const status = parseInt(response.statusCode, 10);

            if ([301, 302, 307].includes(status)) {
                resolve(load(response.headers.location, options));
            } else if (status < 200 || response >= 400) {
                reject(new Error(`Unexpected response, got HTTP ${status}`));
            } else {
                if (isHeadRequest) {
                    resolve({ headers: response.headersn} );
                } else {
                    const chunks = [];
                    response.on('data', function onData (chunk) {  
                        chunks.push(chunk);
                    });
                    response.on('end', function onEnd () { 
                        resolve({
                            status,
                            body: Buffer.concat(chunks).toString('utf8')
                        });
                    });
                }
            }
        });

        if (options.postBody) {
            request.write(postBody);
        }

        request.on('error', reject);

        request.end();
    });
}

And that will be all.

EDIT: Added support to follow if server responds with HTTP redirect.

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Making simple HTTP requests in NodeJS