http-caching | 易学教程

HTTP static resources caching forever stategy

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问题 In Effective Android HTTP Jesse Wilson mentioned the following: Serving static resources like images? Use a permanent URL and let it cache forever I am using Picasso with a specific OkHttp instance for fetching and caching images. I am wondering how to setup the let it cache forever strategy? I can only think about overriding the HTTP cache control header max-stale ( Cache-Control: max-stale= )with the highest possible value, is there another (better) way? 回答1: Best way is to configure your

Why are two requests with different clients from the same computer cache misses on cloudfront?

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问题 My website uses cloudfront for its images. If I load a webpage in a browser, and then use curl to request an image on that page, then the request with curl is a cache miss. A subsequent request with curl is a cache hit. example: run this twice: curl --verbose https://d1hvwudqvjuczb.cloudfront.net/assets/landing/splash_dickenko-2199af423f275d0784c1813cbaab5645.jpg` The first time, X-Cache will be "Miss from cloudfront", the second time it will be "Hit from cloudfront". So it seems cloudfront

How to disallow caching in struts2?

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问题 In my web application, when the user logs out, he should not have access to pages he's previously viewed while he was logged in. However, due to browser caching, he can view those pages when clicked on the back button. I defined an Interceptor to handle this: public String intercept(ActionInvocation invocation) throws Exception { // TODO Auto-generated method stub final ActionContext context = invocation.getInvocationContext(); HttpServletResponse response = (HttpServletResponse)context.get

In Weblogic 10.3.5, is there any way to expire an html file from cache without going through a server restart

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问题 In Weblogic 10.3.5, is there any way to expire an html file from cache without going through a server restart. I am supporting a server with frequent HTML changes and hoping to find a way not to restart the server each time the HTML is updated. Environment is supporting a PeopleSoft domain. Thanks. 回答1: There's a way indeed, the parameter "Resource Reload Check (in seconds)" which can be found on a web app setup is what you're looking for. I've setup this to 5(secondes) in order to have a

Stale-while-revalidate cache replacement from Varnish

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问题 We are currently moving our servers to a new one, with PLESK 12.5 which doesn't support Varnish cache for our PHP applications. We use Varnish, mostly for the 'stale-while-revalidate' capability, so that we can send whole pages or parts (using ESI) without any waiting time for any customer while cache is refreshing. Is there any alternative to Varnish for a similar kind of cache ? Either another "program" that could run on PLESK, or any PHP/server cache ? PLESK comes with NGINX, but it does

How to cache api response using curl, based on returned etag?

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问题 This is a quick question that might help other too. I have a rest service that will return a proper ETAG header for each GET query on it's endpoints. Now, i also need to create a curl http client to query these endpoints and make use of the etags. From my understanding, after making the first request with curl, i need to save the returned etag for later use, so that on all subsequent requests (till the etag invalidates on server) i use the cached version because the server will return a 304

Why aren't my images caching?

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问题 I have an ASP.NET MVC3 application setup. There is a controller that returns back images and I have added the following: [OutputCache(Duration = 3600, VaryByParam = "id;width", Order = 1000, Location = OutputCacheLocation.Client)] public ActionResult Get(string id, int width) { ... } But when I check out the HTTP Response on these images they all have headers that say "cache-control: no-cache" and "expires: -1" which means the browser is never caching them. I'm looking all around and I can't

Is there any Http Caching for ASP.Net Web Forms?

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问题 I have an ASP.Net Web Forms application. The blog post "CacheCow Series - Part 0: Getting started and caching basics" mentions that Output Caching uses HttpRuntime.Cache behind the scene -hence not HTTP caching . The request reaches the server and cached response is sent from the server (when the valid cached output is avaialble on the server). So the entire content is sent across the wire. Is there any HTTP Caching available for ASP.Net Web Forms (where response content is not sent from the

Why are two requests with different clients from the same computer cache misses on cloudfront?

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My website uses cloudfront for its images. If I load a webpage in a browser, and then use curl to request an image on that page, then the request with curl is a cache miss. A subsequent request with curl is a cache hit. example: run this twice: curl --verbose https://d1hvwudqvjuczb.cloudfront.net/assets/landing/splash_dickenko-2199af423f275d0784c1813cbaab5645.jpg` The first time, X-Cache will be "Miss from cloudfront", the second time it will be "Hit from cloudfront". So it seems cloudfront is using some aspect of the request to decide if it should refetch the image or not. What could this

Stale-while-revalidate cache replacement from Varnish

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We are currently moving our servers to a new one, with PLESK 12.5 which doesn't support Varnish cache for our PHP applications. We use Varnish, mostly for the 'stale-while-revalidate' capability, so that we can send whole pages or parts (using ESI) without any waiting time for any customer while cache is refreshing. Is there any alternative to Varnish for a similar kind of cache ? Either another "program" that could run on PLESK, or any PHP/server cache ? PLESK comes with NGINX, but it does not seem to provide 'stale-while-revalidate' capabilities ; I also know Squid isn't supported on PLESK.