etag

IIS 7.5 remove etag headers from response

由 ＊爱你＆永不变心＊ 提交于 2019-11-28 03:50:45
I know this question has been asked alot of times, however most of them were in 2009-2010. I am pretty sure a while back a project I was working on removed them, however I cannot find any way to remove them at the moment. So has there been any advances in this field? It seems crazy that microsoft has made IIS to not be able to easily configure these headers. Currently have tried: Adding a blank etag header to the web.config Adding an etag with quotes inside to the web.config Adding a blank etag header directly through IIS Adding a custom module which removes an etag on BeginResponse Same as

What takes precedence: the ETag or Last-Modified HTTP header?

由 亡梦爱人 提交于 2019-11-28 03:11:15
For two subsequent requests, which of the following two headers is given more weight by browsers should one of them change: ETag or Last-Modified? Thomas S. Trias According to RFC 2616 section 13.3.4, an HTTP 1.1 Client MUST use the ETag in any cache-conditional requests, and if both an ETag and Last Modified are present, it SHOULD use both. The ETag header is considered a strong validator (see section 13.3.3), unless explicitly declared weak by the server, whereas the Last Modified header is considered weak unless at least a minute difference exists between it and the Date header. Note,

Google Chrome does not revalidate etag on back/forth

由 懵懂的女人 提交于 2019-11-27 20:46:42
问题 Even though I send "cache-control: must-revalidate" Google Chrome uses a locally cached page when using the back and forth button in the browser. This is part of the original response: HTTP/1.1 200 OK cache-control: private, must-revalidate etag: "c9239b5d4b98949f8469a05062e05bb999d7512e" Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/html; charset=utf-8 If I refresh the page I get a "HTTP/1.1 304 Not Modified" response but when I use the back button I get the

Getting ETags right

由 余生长醉 提交于 2019-11-27 19:59:47
问题 I’ve been reading a book and I have a particular question about the ETag chapter. The author says that ETags might harm performance and that you must tune them finely or disable them completely. I already know what ETags are and understand the risks, but is it that hard to get ETags right? I’ve just made an application that sends an ETag whose value is the MD5 hash of the response body. This is a simple solution, easy to achieve in many languages. Is using MD5 hash of the response body as

How do I support ETags in ASP.NET MVC?

由 被刻印的时光 ゝ 提交于 2019-11-27 19:44:59
问题 How do I support ETags in ASP.NET MVC? 回答1: @Elijah Glover's answer is part of the answer, but not really complete. This will set the ETag, but you're not getting the benefits of ETags without checking it on the server side. You do that with: var requestedETag = Request.Headers["If-None-Match"]; if (requestedETag == eTagOfContentToBeReturned) return new HttpStatusCodeResult(HttpStatusCode.NotModified); Also, another tip is that you need to set the cacheability of the response, otherwise by

Weak ETAGs in Rails?

由 ◇◆丶佛笑我妖孽 提交于 2019-11-27 18:16:44
问题 What is the best way to tell rails to use weak instead of strong ETAGs when using methods fresh_when and stale? ? The reason I ask is that nginx (correctly) removes strong ETAG headers from responses when on-the-fly gzipping is enabled. 回答1: I took the code from @grosser's answer and turned it into a Gem: https://rubygems.org/gems/rails_weak_etags https://github.com/johnnaegle/rails_weak_etags You can just add this to your gemfile: gem 'rails_weak_etags' And it will be installed into your

How do I remove eTag headers from IIS7?

由 白昼怎懂夜的黑 提交于 2019-11-27 17:02:45
Per Yahoo's best practices for high performance web sites , I'd like to remove Etags from my headers (I'm manually managing all my caching and have no need for Etags... and when/if I need to scale to a farm, I'd really like them gone). I'm running IIS7 on Windows Server 2008. Anyone know how I can do this? Under IIS7 the Etag change number (the part of the Etag following : ) is always set to 0. Hence the Etag from the server no longer varies from server to server for the same file and therefore the Yahoo best practice no longer really applies. Since you can't actually suppress the ETag header

Why isn't my javascript & css caching?

由 瘦欲@ 提交于 2019-11-27 14:02:12
问题 It's appears ONLY javascript and css are not caching ... but images are caching. I am using Firebug and when I refresh the page, I notice in Firebug a lot of 200 HTTP responses for js/css but am receiving 304 HTTP codes (content not modified) for all of my images. So it appears that my JS and CSS are not caching. Also, when using YSlow to help determine the problem with my JS/CSS content not caching, it informs me that: There are 4 components with misconfigured ETags http://www.example.com

Youtube API V3 and Etag

由 亡梦爱人 提交于 2019-11-27 12:58:15
问题 I use the youtube api v3 and i would like to understand how does the Etag. I would like to use it for what it takes to cache purpose but I do not know what to do in PHP. Could you tell me the steps to follow once the etag recovered ? please. Thanks for help. 回答1: According to the youtube docs (https://developers.google.com/youtube/v3/getting-started#etags), an eTag is basically used to determine if a resource has changed. Use them for: Optimization - Caching youtube resources in your app can

前端项目优化 -Web 开发常用优化方案、Vue & React 项目优化

由 淺唱寂寞╮ 提交于 2019-11-27 10:43:46
github github-myBlob 从输入URL到页面加载完成的整个过程 首先做 DNS 查询，如果这一步做了智能 DNS 解析的话，会提供访问速度最快的 IP 地址回来 接下来是 TCP 握手，应用层会下发数据给传输层，这里 TCP 协议会指明两端的端口号，然后下发给网络层。网络层中的 IP 协议会确定 IP 地址，并且指示了数据传输中如何跳转路由器。然后包会再被封装到数据链路层的数据帧结构中，最后就是物理层面的传输了 TCP 握手结束后会进行 TLS 握手，然后就开始正式的传输数据（如果使用HTTPS） 数据在进入服务端之前，可能还会先经过负责负载均衡的服务器，它的作用就是将请求合理的分发到多台服务器上，这时假设服务端会响应一个 HTML 文件 首先浏览器会判断状态码是什么，如果是 200 那就继续解析，如果 400 或 500 的话就会报错，如果 300 的话会进行重定向，这里会有个重定向计数器，避免过多次的重定向，超过次数也会报错 浏览器开始解析文件，如果是 gzip 格式的话会先解压一下，然后通过文件的编码格式知道该如何去解码文件 文件解码成功后会正式开始渲染流程，先会根据 HTML 构建 DOM 树，有 CSS 的话会去构建 CSSOM 树。如果遇到 script 标签的话，会判断是否存在 async 或者 defer ，前者会并行进行下载并执行 JS
订阅 etag