cache-control

问题 I have a simple question. I googled but no answer found. I have a page. I want disable cache for the page content. Yes. I can add Cache-control directive such as Cache-Control: no-cache, no-store, must-revalidate, max-age: 0 But question is: If there is NO HTTP headers relating to Cache returned such as Cache-Control, Expires, Pragma, Last-Modified, ... Does browser/proxy ever cache response in this case? If yes, when? Thank you! 回答1: RFC-compliant clients can be kept from caching a page

问题 I have use following code in my .htaccess file for cache control in my joomla site. ########## Begin - ETag Optimization ## This rule will create an ETag for files based only on the modification ## timestamp and their size. ## Note: It may cause problems on your server and you may need to remove it FileETag MTime Size # AddOutputFilterByType is now deprecated by Apache. Use mod_filter in the future. AddOutputFilterByType DEFLATE text/plain text/html text/xml text/css application/xml

问题 I'm trying to learn about caching, and in particular, partial caching using controls. My website is running slow on certain pages, so caching as much as possible will be helpful. Having run a number of experiments from code I have found on SO and various other Google results, I am running into an issue with dynamically added controls. I have set up a simple page, containing this code: <%@ Page Language="VB" Debug="true" %> <%@ Register TagPrefix="controls" TagName="control" Src="~/test

问题 This page on Cache-Control specifies the following: Standard Cache-Control directives that can be used by the client in an HTTP request. I thought that only servers send back information on whether a client should cache a response. Why would a client send a caching information to the server? 回答1: There may be any number of intermediate proxies between the client and server which do caching. The client can explicitly request explicit caching behaviour from any and all caching entities, things

问题 When the response header is Cache-Control : no-store Firefox stores in memory cache device. If the response header is Cache-Control : no-cache then firefox stores in disk cache device. If the response header is Cache-Control : no-store, no-cache, must-revalidate, max-age=0, post-check=0, pre-check=0 then firefox stores in memory cache device However firefox caching the request in any of one cache device. How to avoid that 回答1: try to set expire or max-age to minimum? another example: Cache

问题 I have a cgi program written in C that outputs gif images, writing them to stdout, and preceded by the cache control lines, fprintf(stdout,"Cache-Control: max-age=99999\n"); fprintf(stdout,"Content-Length: %d\n",nbytes); fprintf(stdout,"Content-Type: image/gif\n\n"); And the CGI is invoked from an HTML page with a tag of the form <img src="http://example.com/cgi-bin/gifprogram.cgi?query_string"> where query_string is the usual form variable=value&etc describing the gif to be generated by the

问题 I set a cache-control on my server of 1 year. How to say to the AppEngine "clear !" to take a new version from the server ? The configuration is Flex custom environment runtime: custom env: flex env_variables: writecontrolEnv: 'prod' handlers: - url: /.* script: this field is required, but ignored service: gateway-prod automatic_scaling: min_num_instances: 1 max_num_instances: 2 resources: cpu: 1 memory_gb: 2 disk_size_gb: 10 skip_files: - node_modules/ network: instance_tag: gateway 回答1:

问题 Specifically, what portions of the URL are used for comparison. Suppose I serve a CSS stylesheet at https://www.example.com/a/b/test.css with the appropriate HTTP headers for cache-control , max-age , etc. When a user goes to each of the following URLs later, which of them will serve the cached file? https://www.example.com/a/b/test.css https://www.example.com/a/b/test.css?abc=123 https://www.example.com/a/b/test.css#abc=124 Basically, what I'm asking is whether or not the "search" and "hash"

问题 I have the following caching attribute on my controller method: [CacheOutput(ClientTimeSpan = 14400, ServerTimeSpan = 14400)] I am attempting to clear the cache. However, after running this line of code: //clear cache cache.RemoveStartsWith(Configuration.CacheOutputConfiguration().MakeBaseCachekey("BeamsController", "Get")); I am still getting a 304 not-modified response without the controller method being invoked. I am using this library https://github.com/filipw/AspNetWebApi-OutputCache 回答1

问题 I am confused about how time-based cache policies work when using HttpWebRequest . I am calling a GET method of a WebAPI that returns JSON content together with a Cache-Control header similar to: Cache-Control: public, max-age=60 The intention is that the content should be considered to be stale after max-age seconds. I am calling this API using HttpWebRequest , and want subsequent requests to be served from the local cache for max-age seconds, then to be retrieved from the server when the