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Site Info - Cdc.gov

Overview of web technologies used by Cdc.gov.

Website Background

Centers for Disease Control and Prevention | CDC

Description on Homepage

Top 10k among all websites

Popularity rank

Drupal is an open source content management system written in PHP, originally developed by Dries Buytaert.

Drupal 7
57% of sites use a newer version
used on a subdomain

PHP is a scripting language for creating websites.

PHP
used on a subdomain

Microsoft's Active Server Pages technology on the .NET framework.

ASP.NET
used on a subdomain

JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages.

JavaScript

jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig.

jQuery

Bootstrap is an open source HTML, CSS, and JavaScript framework.

Bootstrap

Bootstrap is an open source HTML, CSS, and JavaScript framework.

Bootstrap
used on a subdomain

The Apache HTTP Server is an open source web server by the Apache Software Foundation.

Apache 2.4.62
0% of sites use a newer version
used on a subdomain

Amazon is a US-based e-commerce and cloud computing provider.

Amazon
used on a subdomain
hosting info partly based on data from ipinfo.io

Amazon is a US-based e-commerce and cloud computing provider.

Amazon
used on a subdomain

Akamai is a content delivery network. This includes the former brands Instart Logic and StackPath.

Akamai

DigiCert is an SSL certificate authority. This includes Verizon, whose Enterprise SSL Business has been acquired by DigiCert.

DigiCert

Entrust is an IT security service provider, also operating as SSL certificate authority.

Entrust
used on a subdomain

Google Analytics is a free service to get detailed statistics about the visitors of a website, provided by Google. This includes the Ads conversion tracking and the Floodlight services.

Google Analytics
used on a subdomain

Adobe Analytics is a web site traffic analysis service formerly called Omniture. Its products include SiteCatalyst, WebSideStory and Hitbox.

Adobe Analytics
used on a subdomain

The Google Advertising network consists of AdSense, DoubleClick and other services.

Google Ads
used on a subdomain

The Google Tag Manager is a Google service to support webmasters to manage tags on their websites.

Google Tag Manager
used on a subdomain

Facebook Social Plugins provide a way for Facebook users to share web pages with their friends.

Facebook
used until recently

A Twitter Button allows a Twitter user to post a tweet from the visited site.

Twitter
used until recently

LinkedIn Share Buttons enable visitors to to share website content with their LinkedIn network.

LinkedIn
used until recently

External Cascading Style Sheets define style rules in a separate CSS file.

External CSS

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Embedded CSS
used on a subdomain

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

Inline CSS
used on a subdomain

Session cookies are temporary cookies, which are deleted when the user closes the browser.

Session Cookies

Persistent cookies with an expiration time between 1 and 10 years.

Cookies expiring in years

HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security.

HttpOnly Cookies
used on a subdomain

Non-HttpOnly cookies are used in the HTTP protocol and also in client side scripts, which may be a security threat.

Non-HttpOnly Cookies

Secure cookies are used only via an encrypted connections, which may increase security.

Secure Cookies

Non-secure cookies may be used via an unencrypted connections, which may be a security threat.

Non-Secure Cookies

Gzip (GNU zip) is a file compression algorithm.

Gzip Compression

A strong ETag is an HTTP header field for validation of cached web pages, that indicates a byte-for-byte identical page in the cache.

Strong ETag
used on a subdomain

The Internet Protocol version 6 (IPv6) provides amongst others a vastly larger address space than the preceding version 4. We consider a website to support IPv6 if a 128-bit address is assigned to it, regardless of the content delivered at that address.

IPv6

HTTP/2 is the second major version of the HTTP network protocol.

HTTP/2

HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.

HTTP Strict Transport Security

The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com.

Default subdomain www

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

Default protocol https

The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph.

Open Graph

Twitter Cards enable automatic attachment of photos, videos and media elements to Tweets.

Twitter Cards

Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.

Generic RDFa

The Dublin Core Schema is a set of vocabulary terms that can be used to describe web resources and physical resources.

Dublin Core

JSON-LD (JavaScript Object Notation for Linked Data) is a method of encoding Linked Data using JSON.

JSON-LD
used until recently

Microdata is a specification to integrate metadata within existing content on web pages.

Microdata
used until recently

HTML5 is the fifth revision of the HTML standard.

HTML5

XHTML+RDFa (Extensible Hypertext Markup Language + Resource Description Framework in attributes) is an extended version of the XHTML markup language for supporting RDF.

XHTML+RDFa 1.0
used on a subdomain

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

UTF-8

PNG (Portable Network Graphics) is a lossless compression image format, suitable to store graphics with uniformly colored areas, and originally introduced as a free, open-source successor of GIF.

PNG

JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.

JPEG

Scalable Vector Graphics (SVG) is an XML-based vector image format.

SVG

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