caching

问题 in this example you can see a generated HTML-list. On every refresh the script requests the data-file (ajax/test.json) and builds the list again. The generated file "ajax/test.json" is cached statically. But how can I avoid requesting this file on every refresh? // source: jquery.com $.getJSON('ajax/test.json', function(data) { var items = []; $.each(data, function(key, val) { items.push('<li id="' + key + '">' + val + '</li>'); }); $('<ul/>', { 'class': 'my-new-list', html: items. })

问题 I'm using the OutputCache attribute to cache my action's html output at the server-side. Fine, it works, but now I have a situation where the content changes rarely, but when it does, it's critical for the user to see the new data the very next request. So, is there a way to abort the page cache duration programmatically? 回答1: Yes, it is possible using HttpResponse.RemoveOutputCacheItem Method. Check this question: SO - How to programmatically clear outputcache for controller action method

问题 I'm using VaryByCustom to create an output cache on a per-browser and per-user basis: [OutputCache(Duration = 6000, VaryByParam = "*", VaryByCustom="browser;userName")] (I've overridden GetVaryByCustomString() to make this work.) I need to be able to remove a single user's output cache, without invalidating the output cache of different users, if possible. I've read about HttpResponse.RemoveOutputCacheItem() , but that works by removing the output cache based on path. Is there any way to do

问题 I've tried to use caching with collections (with multiple solutions) the problem is that when ever I try caching the response become slower consider the following example of a collection that renders 2 partials for every item in it (around 25 item) json.data do json.array! @organizations do |organization| json.partial! 'api/v1/organizations/organization', organization: organization json.partial! 'api/v1/organizations/links', organization: organization end end without caching the average

问题 Code Igniter version '2.0.3' Jquery 1.7 Jquery History plugin Hi guys, I have a CodeIgniter app that I've built in an ajax fashion. I have a function as follows: $(document).on('click','.ajax_link',function(e){ //Stop the normal href action e.preventDefault(); //Grab the destination URL var new_url = $(this).attr('href') //Grab the content via ajax and pass it to the history change function $.get(base_url+new_url,function(data){ History.pushState({ content:data.content, url:data.url }, data

问题 I've already asked When exactly do things get removed from urlcache's memory and disk? Now I have some more follow up questions: The memory cache is restricted by the iPhone's ram (usually 2Gb). But the disk Persistence is limited by 64Gb or 128Gb. Is that correct? Does it ever make sense to have a persistence more than your memory storage. Can it be useful if you don't want to have a high memory footprint (and don't want app to get terminated from its suspended state) ie allow the cache to

问题 It is possible for an operating system to determine whether a page of memory is in DRAM or in swap; for example, simply try to access it and if a page fault occurs, it wasn't. However, is the same thing possible with CPU cache? Is there any efficient way to tell whether a given memory location has been loaded into a cache line, or to know when it does so? 回答1: In general, I don't think this is possible. It works for DRAM and the pagefile since that is an OS managed resource, cache is managed

问题 I'm setting my headers $offset = 60 * 15; header("Expires: " . gmdate("D, d M Y H:i:s", time() + $offset) . " GMT"); header("Cache-Control: max-age=$offset, must-revalidate"); However when running FireBug its giving me the following header information HTTP/1.1 200 OK Date: Mon, 25 Jul 2011 12:15:12 GMT Server: Apache/2.2.11 (Win32) DAV/2 mod_ssl/2.2.11 OpenSSL/0.9.8i PHP/5.2.9 X-Powered-By: PHP/5.2.9 Expires: Sat, 01 Jan 2000 00:00:01 GMT Cache-Control: post-check=0, pre-check=0, max-age=0

问题 Im wondering how the performance of th ESI module is nowadays? I've read some posts on the web that ESI performance on varnish were actually slower than the real thing. Say i had a page with over 3500 esi includes, how would this perform? is esi designed for such usage? 回答1: We're using Varnish and ESI to embed sub-documents into JSON documents. Basically a response from our app-server looks like this: [ <esi:include src="/station/best_of_80s" />, <esi:include src="/station/herrmerktradio" />

问题 In case there's no cache expiration related headers (except Date , Last-Modified and ETag ) in an HTTP response what would be the expiration period for a resource if its Content-Type is text/html? Does it depend on the browser? 回答1: From the HTTP/1.1 specification on Response Cacheability: If there is neither a cache validator nor an explicit expiration time associated with a response, we do not expect it to be cached, but certain caches MAY violate this expectation (for example, when little