caching
URLresponse is not retrieved after storing in cache using storeCachedResponse
Welcome to the wonderful world of asynchronous caches. NSURLCache is highly asynchronous. Just because you’ve shoved data into it doesn’t mean it is available for retrieval. You have to let the main run loop return before it will be available, and possibly even wait a little while. The failure to return a response immediately after … Read more
is meta http-equiv value cache control is not supported?
The <meta http-equiv> tags are only used when the HTML file in question is been opened from a non-HTTP resource such as local disk file system (via file:// URI) and not when the HTML file in question is been opened from a real HTTP resource (via http:// URI). Instead, the real HTTP response headers as … Read more
iPhone storage in tmp directory
The OS will delete the temp directory on restart and at other indeterminate points. If you need to store something somewhere that you don’t want backed up then use the cache directory. That will not be deleted and will not be backed up. Your application will not be running when the temp is deleted nor … Read more
Virtually indexed physically tagged cache Synonym
The page offset is bits 0-11, not 0-13. Look at your bottom diagram: the page offset is the low 12 bits, so you have 4k pages (like x86 and other common architectures). If any of the index bits come from above the page offset, VIPT no longer behaves like a PIPT with free translation for … Read more
Reload the page on hitting back button
header(“Expires: Thu, 19 Nov 1981 08:52:00 GMT”); //Date in the past header(“Cache-Control: no-store, no-cache, must-revalidate”); //HTTP/1.1 This works for me on FF3.6, IE7, IE8, Chrome5 (when hitting browser’s back/forth button the page is always RELOADED) Another solution is to send exactly the same headers sent by session_start() function, very similar to the ones above, but … Read more
Android + Picasso: changing URL cache expiration
Disk caching happens “below” Picasso inside the HTTP client. In fact, this process is completely transparent. We never explicitly ask for a cached-version or an internet-version, the HTTP client will make the decision internally and do the right thing. Because we opted to leverage the HTTP client for caching, we’re offered very little control over … Read more
How to empty/flush Windows READ disk cache in C#?
Constantin: Thanks! That link has a command-line EXE which does the testing I was looking for. I also found a link off that page to a more interesting article (in Word and PDF) on this page: Sequential File Programming Patterns and Performance with .NET In this article, it talks about Un-buffered File Performance (iow, no … Read more
caching images served by servlet
The default servlet serving static content in containers like Tomcat doesn’t set any cache control headers. You don’t need write a servlet just for that. Just create a filter like this, public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { long expiry = new Date().getTime() + cacheAge*1000; HttpServletResponse httpResponse = (HttpServletResponse)response; httpResponse.setDateHeader(“Expires”, … Read more
prevent browser back button cache
Thanks guys for helping me out but i found a way that force the browser to prevent cache and i have used the below code : header(“Cache-Control: no-cache, no-store, must-revalidate”); // HTTP 1.1. header(“Pragma: no-cache”); // HTTP 1.0. header(“Expires: 0 “); // Proxies. here is the reference : Making sure a web page is not … Read more