URL Scan Results for the page [Duolingo - The world's best way to learn a language](https://www.duolingo.com/stories/)

Document

Links

The outgoing links identified from the page.

JavaScript Variables

Global JavaScript variables are variables that are defined outside of any function or block scope in JavaScript.

Technology

The technologies identified are present on the scanned URL.

Name	Description	Detected patterns
JavaScript frameworks
React https://reactjs.org	React is an open-source JavaScript library for building user interfaces or UI components.	Type: html Regex: <[^>]{1,250}data-react
Security
reCAPTCHA https://www.google.com/recaptcha/	reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.	Type: scriptSrc Regex: \/recaptcha\/(?:api|enterprise)\.js
Web servers
Nginx https://nginx.org/en	Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.	Type: headers Name: server Regex: nginx(?:\/([\d.]{1,250}))?
Operating systems
Ubuntu https://www.ubuntu.com/server	Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.	Type: headers Name: server Regex: Ubuntu
Tag managers
Google Tag Manager https://www.google.com/tagmanager	Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.	Type: html Regex: googletagmanager\.com\/ns\.html[^>]{1,250}><\/iframe>
Reverse proxies
Envoy https://www.envoyproxy.io/	Envoy is an open-source edge and service proxy, designed for cloud-native applications.	Type: headers Name: x-envoy-upstream-service-time Regex: (?:)
Nginx https://nginx.org/en	Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.	Type: headers Name: server Regex: nginx(?:\/([\d.]{1,250}))?
Cookie compliance
OneTrust https://www.onetrust.com	OneTrust is a cloud-based data privacy management compliance platform.	Type: scriptSrc Regex: cdn\.cookielaw\.org
Authentication
Google Sign-in https://developers.google.com/identity/sign-in/web	Google Sign-In is a secure authentication system that reduces the burden of login for users, by enabling them to sign in with their Google account.	Type: scriptSrc Regex: accounts\.google\.com\/gsi\/client

Performance

The speed and efficiency of the scanned URL loads and displays its content.

dns

1 ms

Good

tcp

235 ms

Poor

requestTime

15 ms

Good

dom

4060 ms

Poor

DNS Record

A DNS record maps a domain name to an IP address or other resource information.

SSL Certificate

An SSL certificate is a digital certificate that verifies the authenticity and encrypts the communication between a website and its visitors.

HTTP Headers

HTTP Header

An HTTP header is a component of an HTTP request or response that contains additional information about the message being sent or received.

Content Security Policy

Content Security Policy (CSP) is a security mechanism that helps prevent cross-site scripting (XSS) and other code injection attacks by specifying which content sources are allowed to be loaded on a web page.

Cookies

Cookies are small pieces of data stored on a user's web browser to track and remember information about their browsing activity on a website.