Nginx 1.7.10

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   Nginx is a web server which can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. The software was created by Igor Sysoev and first publicly released in 2004. A company of the same name was founded in 2011 to provide support and Nginx plus paid software.

PHP 5.6.6

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   PHP: Hypertext Preprocessor is a general-purpose programming language originally designed for web development.

Character Encoding :UTF-8

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   This website is using UTF-8 character encoding in HTML , character encoding is used to represent a repertoire of characters by some kind of encoding system.

Vary Header Accept-Encoding

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   The Accept-Encoding request HTTP header advertises which content encoding, usually a compression algorithm, the client is able to understand. Using content negotiation, the server selects one of the proposals, uses it and informs the client of its choice with the Content-Encoding response header.

Meta keywords

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   Meta keywords are types of meta tags in the HTML source code of a webpage. They describe the content of a website shortly and concisely,this website is using the following keywords: 极客学院,wiki,it程序语言开发文档,it编程api,android,ios,java,swift,objective-c,apple watch,python,html5,sql

Meta Description

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   A meta description is a 160-character snippet, a meta tag in HTML, that summarizes a page`s content. this website is having meta description of the following : 极客学院 Wiki 为中国最大 IT 职业在线教育平台极客学院旗下图文开发技术教程站点，拥有海量 IT 图文教程，涵盖 30+ 个技术领域，如 Android, iOS, Java, Python, HTML5, Swift, Cocos2dx, Apple Watch 等图文教程。

No Cache Content

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   Forces caches to submit the request to the origin server for validation before releasing a cached copy.