cache-control

问题 I'm having problem with deploying servlet on Jetty. It seems that Jetty simply drops Cache-Control (and Pragma ) headers produced in servlet. public abstract class Servlet extends HttpServlet { ... @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { ... resp.setHeader("Cache-Control", "private, no-cache"); resp.setHeader("Pragma", "no-cache"); ... } ... } All headers (esp. Cache-Control and Pragma) are as expected when I

问题 I searched all over and found a method to cache images on Amazon S3. Whenever I upload an image, I add a meta element of cache-control and then set max-age=86400 . However, on any sort of speed test site it says that my images do not have a cache applied to them. I am not sure if it matters, but I have CloudFront linked to this S3 bucket. Sorry, but completely new to AWS. Anyone know why my images may not be caching? 回答1: on any sort of speed test site it says that my images do not have a

问题 Using LiveHttpHeaders for Firefox 6 I was trying to see if my css, JS files being cached using Headers Module from Apache using htaccess. But I confuse, there are 2 values from the 'Cache-Control' data: GET /proz/css/global.css HTTP/1.1 Host: localhost User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20100101 Firefox/5.0 Accept: text/css,*/*;q=0.1 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive Referer:

问题 I know that its possible to reference third party JavaScript files on the web like so: <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script> Is it possible to reference javaScript file on my local machine by doing something like this? <script src="file:///C:/folder/custom_javascript.js" type="text/javascript"></script> I suspect this may be a no-no, since it could be a way for websites to find out what files are on a client's computer..

问题 Im testing how cache-control header works on Chrome. My setup in nginx is quite easy: server { listen 80; server_name localhost; etag on; root /usr/share/nginx/html; location / { add_header Cache-Control "must-revalidate, private, max-age=10"; } } The behaviour I was expecting for the setup would be: max-age: Use cache for the specified time in seconds etag: Use for validating freshness of data private: avoid proxy caches to keep the data With hard-reloads Im getting the expected behaviour: 1

问题 Suppose the CPU modifies the value in location x+50 and does not flush it back to main memory(write-back). Meanwhile, a device launches a DMA read request from x to x+100. In that case, how the CPU is informed to flush back the dirty cache line? 回答1: The DMA circuitry often works directly with the main memory without involving the CPU (and that's the main idea, to free the CPU from doing I/O that can be done elsewhere in the hardware and thus save CPU cycles). So, you may indeed run into

问题 I want to set a far future Expires headers to reduce requests made from individual browsers. I'd also like to set Cache-Control: s-maxage=600 so that proxy caches (and CDNs) revalidate with the origin every 10 minutes for fresh content. Will browsers honour the Expires header despite the existence of a Cache-Control header (which supposedly supersedes it) with a s-maxage directive? 回答1: If a response includes both an Expires and a Cache-Control max-age directive, the max-age overrides the

问题 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. 回答1: Friends, After a long search on Google. I got one solution for this.

问题 I have a mostly static HTML website served from CDN (plus a bit of AJAX to the server), and do want user's browsers to cache everything, until I update any files and then I want the user's browsers to get the new version. How do I do achieve this please, for all types of static files on my site (HTML, JS, CSS, images etc.)? (settings in HTML or elsewhere). Obviously I can tell the CDN to expire it's cache, so it's the client side I'm thinking of. Thanks. 回答1: One way to achieve this is to

问题 On the Intel x86 platform running Linux, in C/C++, how can I tell the OS and the hardware to store a value (such as a uint32) in L1/L2 cache, and not in system memory? For example, let's say either for security or performance reasons, I don't want to store a 32-bit key (a 32-bit unsigned int) in DRAM, and instead I would like to store it only in the processor's cache. How can I do this? I'm using Fedora 16 (Linux 3.1 and gcc 4.6.2) on an Intel Xeon processor. Many thanks in advance for your