cache-control

Add Cache-Control and Expires headers to Azure Storage Blobs

由 为君一笑 提交于 2019-11-26 19:29:02
问题 I'm using Azure Storage to serve up static file blobs but I'd like to add a Cache-Control and Expires header to the files/blobs when served up to reduce bandwidth costs. Application like CloudXplorer and Cerebrata's Cloud Storage Studio give options to set metadata properties on containers and blobs but get upset when trying to add Cache-Control. Anyone know if it's possible to set these headers for files? 回答1: I had to run a batch job on about 600k blobs and found 2 things that really helped

what’s the difference between Expires and Cache-Control headers?

由 拜拜、爱过 提交于 2019-11-26 15:01:49
问题 What’s the difference between Expires and Cache-Control headers? 回答1: Cache-Control was introduced in HTTP/1.1 and offers more options than Expires . They can be used to accomplish the same thing but the data value for Expires is an HTTP date whereas Cache-Control max-age lets you specify a relative amount of time so you could specify "X hours after the page was requested". HTML Cache control is a very similar question and has a good link to a caching tutorial that should answer most of your

Why after logout clicking back button on the page displays previous page content?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-11-26 14:18:08
问题 I am working on a Struts 2 project. When user clicks a logout button the logout action clears the session using session.clear() . But when user clicks the back button in the browser after logout, it still displays the previous page content. I want to redirect an user to the login page, if the back button was clicked in the browser after logout. Is there anything else I should clear in my logout action to solve this problem? Any help will be greatly appreciated. 回答1: Turns out that your

Preventing cache on back-button in Safari 5

由 末鹿安然 提交于 2019-11-26 12:17:17
问题 As of recent safari 5 was released, and it turns out to cause some problems for my website. I have a dynamic website running classic ASP (though that shouldn\'t matter much) and the site has some creative use of the history stack. For instance, you can be on a page that lists products, then go to details about a product and change the product (admin-view). When you click save on the product the information is sent to the server via AJAX, and a history.back() is issued. This works great in all

HTTP Cache Control max-age, must-revalidate

由 為{幸葍}努か 提交于 2019-11-26 12:05:02
问题 I have a couple of queries related to Cache-Control. If I specify Cache-Control max-age=3600, must-revalidate for a static html/js/images/css file, with Last Modified Header defined in HTTP header: Does browser/proxy cache(like Squid/Akamai) go all the way to origin server to validate before max-age expires ? Or will it serve content from cache till max-age expires? After max-age expiry (that is expiry from cache), is there a If-Modified-Since check or is content re-downloaded from origin

Add an Expires or a Cache-Control header in JSP

由 大兔子大兔子 提交于 2019-11-26 12:02:31
问题 How do you add an Expires or a Cache-Control header in JSP? I want to add a far-future expiration date in an include page for my static components such as images, CSS and JavaScript files. 回答1: To disable browser cache for JSP pages, create a Filter which is mapped on an url-pattern of *.jsp and does basically the following in the doFilter() method: HttpServletResponse httpResponse = (HttpServletResponse) response; httpResponse.setHeader("Cache-Control", "no-cache, no-store, must-revalidate")

Is Chrome ignoring Cache-Control: max-age?

由 走远了吗. 提交于 2019-11-26 09:28:27
问题 Background: IIS 7 AspNet 3.5 web app Chrome dev tools lists 98 requests for the home page of the web app (aspx + js + css + images). In following requests, status code is 200 for css/images files. No cache info, browser asks server each time if file has to be updated. OK. In IIS 7 I set HTTP header for cache control, set to 6 hours for the \"ressources\" folder. In Chrome, using dev tools, I can see that header is well set in response: Cache-Control: max-age=21600 But I still get 98 requests.

Make IE cache the resources but always revalidate

由 旧时模样 提交于 2019-11-26 08:48:30
问题 The cache control header \"no-cache, must-revalidate, private\" allows browsers to cache the resource but forces a revalidate with conditional requests. This works as expected in FF, Safari, and Chrome. However, IE7+8 does not send a conditional request, that is, \"If-Modified-Since\" is missing in the request header and hence the server responds with HTTP/200 instead of HTTP/304. Here are the full server response headers: Last-Modified: Wed, 16 Feb 2011 13:52:26 GMT Content-type: text/html

What is the difference between HTTP status code 200 (cache) vs status code 304?

由 。_饼干妹妹 提交于 2019-11-26 05:49:31
I'm using the Google "Page Speed" plug-in for Firefox to access my web site. Some of the components on my page is indicated as HTTP status: 200 200 (cache) 304 By Google's "Page Speed". What I'm confused about is the difference between 200 (cache) and 304. I've refreshed the page multiple times (but have not cleared my cache) and it always seems that my favicon.ico and a few images are status=200 (cache) while some other images are http status 304. I don't understand why the difference. UPDATE : Using Google "Page Speed", I receive a "200 (cache)" for http://example.com/favicon.ico as well as

What is the difference between HTTP status code 200 (cache) vs status code 304?

由 大憨熊 提交于 2019-11-26 01:55:56
问题 I\'m using the Google \"Page Speed\" plug-in for Firefox to access my web site. Some of the components on my page is indicated as HTTP status: 200 200 (cache) 304 By Google\'s \"Page Speed\". What I\'m confused about is the difference between 200 (cache) and 304. I\'ve refreshed the page multiple times (but have not cleared my cache) and it always seems that my favicon.ico and a few images are status=200 (cache) while some other images are http status 304. I don\'t understand why the
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