cdn | 易学教程

Find Mime type of file or url using php for all file format

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问题 Hi I am looking for best way to find out mime type in php for any local file or url. I have tried mime_content_type function of php but since it is deprecated I am looking for better solution in php for all file format. mime_content_type — Detect MIME Content-type for a file ***(deprecated)*** I have already tried below function echo 'welcome'; if (function_exists('finfo_open')) { echo 'testing'; $finfo = finfo_open(FILEINFO_MIME); $mimetype = finfo_file($finfo, "http://4images.in/wp-content

How can I update files on Amazon's CDN (CloudFront)?

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问题 Is there any way to update files stored on Amazon CloudFront (Amazon's CDN service)? Seems like it won't take any update of a file we make (e.g. removing the file and storing the new one with the same file name as before). Do I have to explicitly trigger an update process to remove the files from the edge servers to get the new file contents published? Thanks for your help 回答1: Amazon added an Invalidation Feature. This is API Reference. Sample Request from the API Reference: POST /2010-08-01

DNS & CDN & HTTPDNS 原理简析

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> DNS & CDN & HTTPDNS 原理简析背景：域名系统 DNS (Domain Name System ): 作为域名和 IP 地址相互映射的一个分布式数据库，通过 DNS 可以将域名迅速解析为对应的 IP 地址，从而方便我们访问 Internet 上的任意一台主机（或网站）。 CDN(Content Delivery Network): 其基本思路是尽可能避开互联网上有可能影响数据传输速度和稳定性的瓶颈和环节，使内容传输的更快、更稳定。 HTTPDNS : 使用 HTTP 请求来模拟 DNS 请求 0x00 DNS 原理 DNS 服务器类型：内部 DNS ：位于内网中，提供内网 DNS 服务，也具备 Internet DNS 缓存与转发能力外部 DNS：位于 Internet 中，提供 Internet 的 DNS 服务（包括 DNS 缓存与转发）主 DNS：提供 DNS 服务（包括查询，缓存写入）辅 DNS：只提供 DNS 查询服务，与主 DNS 同步数据库唯缓存 DNS：自身不具备 DNS 解析能力，但具有 DNS 缓存数据库转发 DNS：具备转发特性，能将 DNS 请求转发给其他 DNS 服务器权威 DNS：自身数据库中存在与 DNS 请求相对应的映射非权威 DNS

HTTPS and external (CDN) hosted files?

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问题 I have a page that references a couple of externally hosted javascript files - namely, jQuery on Google and YUI using YUI Loader. The trouble is when I access the page via HTTPS the browser complains of mixed insecure content, since the external javascript files are being accessed using http instead of https. What's a good way to deal with this, accessing the external jQuery and YUI Loader objects with HTTPS? 回答1: Assuming the CDN provider has an https version, you can use protocol-relative

CDN 基础知识

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CDN 技术 CDN 基础知识 CDN是什么？有什么作用？ CDN的诞生什么是CDN？为什么要用 CDN CDN 基本原理 CDN 调度 DNS 调度方法 HTTP 302 调度 HTTP DNS调度 CDN 接入原理 dig 和 DNS 记录类型最终接入 CDN CDN 基础知识 CDN是什么？有什么作用？ CDN的诞生 CDN技术诞生于二十多年前，随着网络的逐渐普及，以及数据长传的需求逐渐增多，骨干网的压力越来越大，而且网络压力越大，导致丢包越来越严重，长传的质量也越来越差。于是1995年，MIT的应用数学教授 Tom Leighton 带领着研究生 Danny Lewin 和其他几位研究人员一起尝试使用数学的方法来解决网络拥塞的问题。他们使用数学算法，处理内容的动态路由安排，并最终解决了困扰 Internet 使用者的难题。后台，史隆管理学院的 MBA 学生 Jonathan Seelig 加入了他们的队伍，从那以后他们开始实施自己的商业计划，最终于 1988 年 8 月 20 号正式成立公司，命名为 Akamai （Akamai 至今仍是全球 CDN 布点最多，技术最成熟的公司）划重点： CDN 是用来解决 Internet 骨干网网络拥塞问题的方案；世界上第一家 CDN 商业公司是 Akamai ；什么是CDN？ CDN 的全称为 Content

Using Postbacks with a CDN

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问题 We have a Sitecore/Webforms based website that we'd like to run behind Akamai CDN however we're having an issue with ViewState MAC validation on our postbacks. We've worked around this for most of the core forms on the site (by taking them out of the CDN cache and serving them direct for every user), but we're left with a simple form in the footer of every page that posts back to the server. Currently we're seeing errors: Validation of viewstate MAC failed. I believe this is caused by the CDN

DataTables CDN fallback expressions

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问题 What are the CDN fallback expressions for the DataTables script and its extensions? https://cdn.datatables.net For example (source): jQuery --> window.jQuery jQuery.UI --> window.jQuery.ui Modernizr --> window.Modernizr Bootstrap --> $.fn.modal 回答1: You can determine whether jQuery DataTables is available by testing whether $.fn.dataTable exists. So I assume you need to use: bundle.CdnFallbackExpression = "$.fn.dataTable"; 来源： https://stackoverflow.com/questions/31707750/datatables-cdn

Using the same URL split traffic based on country?

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问题 I have a website that operates in the UK, I wish to expand to the US using the same URL but with two different servers (one UK server and one US server, as the websites on each server will be completely different). The website is a wordpress marketplace hosted by a linux EC2. How can I send users from the US to the US version of the site? can I also allow users to alternate between to the two versions? (incase someone from the US wishes to see the UK version?) 回答1: you can do this with

Using the same URL split traffic based on country?

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TinyMCE with CDN on Contao 3.x

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问题 I have a Contao 3.x website where I use CDN for the assets. The problem that gives rise to on the backend is that TinyMCE does not work anymore. I read that there is a different cdn js for loading TinyMCE with CDN, but on a Contao (or probably the same with any other CMS using TinyMCE), and especially the backend, something like that is auto configured by the system. I could try to make a core change inserting a script tag on the template, but that is not optimal at all and not what I am