cache-control | 易学教程

CDN 内容分发网络

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在互联网有一个“8秒原则”，即如果有一个页面的响应时间超过8秒，那么大部分的用户就会放弃加载，从而放弃使用该页面或网站。淘宝，京东，苏宁等电商每天都有成千上万的访问量，在618电商节，双十一购物逛欢节更是具有数以万计的秒杀活动，是什么能够支撑系统在如此高并发情况下还能正常运行？这就不得不提CDN了，CDN是什么呢，让我们一探究竟。 CDN是什么? CDN其全称是Content Delivery Network，即内容分发网络。 CDN是构建在网络上的内容分发网络，具备内容存储和分发两个关键要素。其基本原理是广泛采用各种缓存服务器，将这些缓存服务器分布到用户访问相对集中的地区或网络中，在用户访问网站时，利用全局负载技术将用户的访问指向距离最近的工作正常的缓存服务器上，由缓存服务器直接响应用户请求。比如说，北京的用户让他访问北京的节点，上海的用户让它访问上海的节点,而不是北京的用户访问上海的节点，上海的用户访问北京的节点，这样会极大增加用户的访问时长，及访问的成本。通过就近访问，加速用户对网站的访问，解决Internet网络拥堵状况，提高用户访问网络的响应速度。 CDN就像网络中的快递小哥，把你网购的商品从最近的仓库拿出并选择最优的路线，并将包裹及时的送到指定收货地点。 CDN就是扮演护航及加速的角色，使得每一个网络请求能够请求更快，时延更小，响应更快，带来更为极致的用户体验

Cache-Control header in firebase.json file not working

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问题 The Cache-Control header setting in my firebase.json file does not seem to be working. I have set the max-age value, for all files, to 31536000 (1 year). My firebase.json file is- { "hosting": { "public": "public" }, "ignore": [ "firebase.json", "**/.*", "**/node_modules/**" ], "headers": [{ "source": "**", "headers": [{ "key": "Cache-Control", "value": "max-age=31536000" }] }] } The file seems to abide by the firebase documentation. But the max-age value, for all files, is still set to the

Define specific cache control header for selected file only

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问题 I'm setting up a Nginx sever (version 1.17.1) for Gatsby following up the recommendation at https://www.gatsbyjs.org/docs/caching/. The snippet below is the portion my server {} block attempting implementing the recommended caching configuration; location ~* \.(?:html)$ { add_header Cache-Control "public, max-age=0, must-revalidate"; } location /static { add_header Cache-Control "public, max-age=31536000, immutable"; } location ~* \.(?:css|js)$ { add_header Cache-Control "public, max-age

Why browser does not send “If-None-Match” header?

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问题 I'm trying to download (and hopefully cache) a dynamically loaded image in PHP. Here are the headers sent and received: Request: GET /url:resource/Pomegranate/resources/images/logo.png HTTP/1.1 Host: pome.local Connection: keep-alive Cache-Control: max-age=0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.22 (KHTML, like Gecko) Ubuntu Chromium/25.0.1364.160 Chrome/25.0.1364.160 Safari/537.22 Accept-Encoding:

清除html缓存

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nginx配置： location / { root /home/tjzg/gl; index login.html; add_header Cache-Control no-cache; add_header Cache-Control private; expires 0s; } 来源： CSDN 作者：呓语的风链接： https://blog.csdn.net/zml_moxueli/article/details/80091080

JBoss7 setting Cache-Control, Pragma to no-cache for all responses from RESTEasy

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问题 I'm trying to add Cache-Control headers to the responses generated in JBoss 7 using the RESTEasy framework. However, all the responses end up getting multiple Cache-Control headers due to JBoss adding a no-cache header by default. I can't find any setting to remove it and adding interceptors is also not working since a no-cache header is being added later. Can someone tell me how to disable the default pragma and cache-control headers in JBoss 7? Note: I'm using resteasy with Stateless EJBs.

How can I tell the “current age” of a cached page?

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问题 I'm wondering how the browser determines whether a cached resource has expired or not. Assume that I have set the max-age header to 300. I made a request at 14:00, 3 minutes later I made another request to the same resource. So how can the browser tell the resource haven't expired (the current age which is 180 is less than the max-age )? Does the browser hold a "expiry date" or "current age" for every requested resource? If so how can I inspect the "current age" at the time I made the request

Browser cache expiration for js and css files with wildfly

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问题 I have a angularjs javascript app packaged in a webapp deployed to Wildfly 8.2.1. Sometimes, when I deploy javascript or css modifications to this webapp, users have to manually delete their browser cache for the modifications appear. Is there a way to change this behavior so users don't have to delete their browser cache every time? 回答1: I've shared a Gist article about that. It describes how to configure response headers in wildfly undertow subsytem to tune expiration cache headers in

ROR + MVC Disable Browser Cache

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I am looking for method to disable Browser Cache for entire Ruby On Rails MVC Website I found following method, Response.Cache.SetExpires(DateTime.Now.AddSeconds(5)); Response.Cache.SetCacheability(HttpCacheability.Public); Response.Cache.SetValidUntilExpires(true); and also for meta tag method. <meta http-equiv="PRAGMA" content="NO-CACHE"> But i am looking for simple method, to disable browser cache for entire website. Friends, After a long search on Google. I got one solution for this. I do not know Is this better or best. But My problem is resolved. Add below your code in application

Chrome is caching even with HTTP no-cache headers

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问题 I am trying to serve a PHP file output with HTTP Headers configured so the content will NOT be served from cache in Chrome. If I go to Dev tools (in Chrome), and mark the "Disable cache" option, then it works. But I don't want to depend on that, I hope I can setup HTTP headers in a way I can force Chrome to reload the page everytime. Here's a screenshot of my current attempt, please note the red marks. Could you please provide good documentation or which headers I must declare for this ?