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Site Info - Costco.comOverview of web technologies used by Costco.com. Website Background Welcome to Costco WholesaleShop Costco.com for electronics, computers, furniture, outdoor living, appliances, jewelry and more. Enjoy low warehouse prices on name-brand products delivered to your door. Description on Homepage Top 1k among all websites Popularity rank Microsoft's Active Server Pages technology on the .NET framework. Java is a general-purpose language originally developed by Sun Microsystems. JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages. jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig. Nginx (pronounced as "engine X") is a lightweight open source web server developed by Igor Sysoev. Nginx Amazon is a US-based e-commerce and cloud computing provider. Amazon Amazon is a US-based e-commerce and cloud computing provider. Amazon Akamai is a content delivery network. This includes the former brand Instart Logic. Amazon CloudFront is a content delivery web service by Amazon. Amazon CloudFront Akamai is a content delivery network. Proofpoint provides email protection and other IT security services. DigiCert is an SSL certificate authority. This includes Verizon, whose Enterprise SSL Business has been acquired by DigiCert. Segment is a customer data platform that includes web traffic data collection. Segment Adobe Analytics is a web site traffic analysis service formerly called Omniture. Its products include SiteCatalyst, WebSideStory and Hitbox.
The Google Advertising network consists of AdSense, DoubleClick and other services. Google Ads Adobe DTM (Dynamic Tag Management) is a tag management system by Adobe, part of Abode Analytics. This includes Satellite, previously owned by Search Discovery, and Adobe TagManager. The Google Tag Manager is a Google service to support webmasters to manage tags on their websites. Google Tag Manager External Cascading Style Sheets define style rules in a separate CSS file. Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page. Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute. Session cookies are temporary cookies, which are deleted when the user closes the browser. Persistent cookies with an expiration time of up to 1 day. Persistent cookies with an expiration time between 1 day and 1 month. Persistent cookies with an expiration time between 1 month and 1 year. HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security. Non-HttpOnly cookies are used in the HTTP protocol and also in client side scripts, which may be a security threat. Secure cookies are used only via an encrypted connections, which may increase security. Non-secure cookies may be used via an unencrypted connections, which may be a security threat. Gzip (GNU zip) is a file compression algorithm. Brotli is a lossless compression algorithm developed by Google. Brotli Compression A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache. Weak ETag HTTP/2 is the second major version of the HTTP network protocol. 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. The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/. JSON-LD (JavaScript Object Notation for Linked Data) is a method of encoding Linked Data using JSON. Microdata is a specification to integrate metadata within existing content on web pages. 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 HTML5 is the fifth revision of the HTML standard. UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII. 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. JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images. Scalable Vector Graphics (SVG) is an XML-based vector image format. GIF (Graphics Interchange Format) is a lossless compression image format, originally introduced by CompuServe and suitable to store graphics, logos and simple animations.
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