The HTTP `Cache-Control` header specifies directives which override default HTTP caching behaviour.
The HTTP Cache-Control header specifies directives which override default HTTP caching behaviour.
Questions tagged [cache-control]
1406 questions
726
votes
9 answers
What's the difference between Cache-Control: max-age=0 and no-cache?
The header Cache-Control: max-age=0 implies that the content is considered stale (and must be re-fetched) immediately, which is in effect the same thing as Cache-Control: no-cache.
rubyruy
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votes
6 answers
Difference between no-cache and must-revalidate for Cache-Control?
From the RFC 2616
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.1
no-cache
If the no-cache directive does not specify a field-name, then a cache
MUST NOT use the response to satisfy a subsequent request without
successful…
Luke Puplett
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226
votes
5 answers
What is the difference between HTTP status code 200 (cache) vs status code 304?
I'm using the Google "Page Speed" plug-in for Firefox to access my web site.
Some of the components on my page is indicated as HTTP status:
200
200 (cache)
304
By Google's "Page Speed".
What I'm confused about is the difference between 200 (cache)…
Hank
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216
votes
7 answers
what’s the difference between Expires and Cache-Control headers?
What’s the difference between Expires and Cache-Control headers?
whiterose
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182
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19 answers
Cached, PHP generated Thumbnails load slowly
Question Part A ▉ (100 bountys, awarded)
Main question was how to make this site, load faster. First we needed to read these waterfalls. Thanks all for your suggestions on the waterfall readout analysis. Evident from the various waterfall graphs…
Sam
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171
votes
4 answers
What is Cache-Control: private?
When I visit chesseng.herokuapp.com I get a response header that looks like
Cache-Control:private
Connection:keep-alive
Content-Encoding:gzip
Content-Type:text/css
Date:Tue, 16 Oct 2012 06:37:53 GMT
Last-Modified:Tue, 16 Oct 2012 03:13:38…
user782220
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153
votes
1 answer
Private vs Public in Cache-Control
Can you please describe an example indicating difference between Public and Private Cache-Control in asp.net applications hosted in IIS.
I read in MSDN that the difference is the following:
Public:
Sets Cache-Control: public to specify that the…
ppolyzos
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152
votes
7 answers
How to prevent Browser cache for php site
I have a php site running in cloud server.When ever i add new files css, js or images the browser is loading the same old js, css and image files stored in cache.
My site has a doctype and meta tag as below
ArrayOutOfBound
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146
votes
8 answers
How to prevent Browser cache on Angular 2 site?
We're currently working on a new project with regular updates that's being used daily by one of our clients. This project is being developed using angular 2 and we're facing cache issues, that is our clients are not seeing the latest changes on…
Rikku121
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142
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2 answers
Is it fine if first response is private with AppCache (Symfony2)?
I'm trying to use http caching. In my controller I'm setting a response as follows:
$response->setPublic();
$response->setMaxAge(120);
$response->setSharedMaxAge(120);
$response->setLastModified($lastModifiedAt);
dev mode
In dev environment first…
Jakub Zalas
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105
votes
3 answers
Max value for cache control header in HTTP
I'm using Amazon S3 to serve static assets for my website. I want to have browsers cache these assets for as long as possible. What meta-data headers should I include with my assets
Cache-Control: max-age=???
Casey Flynn
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102
votes
10 answers
Caching effect on CORS: No 'Access-Control-Allow-Origin' header is present on the requested resource
The short version of this issue is we are seeing the typical CORS error (x has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.) however we are absolutely sending the specified headers. The…
Chris Pearce
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votes
3 answers
HTTP Cache Control max-age, must-revalidate
I have a couple of queries related to Cache-Control.
If I specify Cache-Control max-age=3600, must-revalidate for a static html/js/images/css file, with Last Modified Header defined in HTTP header:
Does browser/proxy cache(like Squid/Akamai) go…
nyb
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votes
2 answers
how does a etag work in expressjs
Expressjs automatically send etags. I would like to know how the etag is generated..is it based on the content that is generated dynamically by the get routine. or is there way I can mainpulate it, by not even going through the process of generating…
coool
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62
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8 answers
Is Chrome ignoring Cache-Control: max-age?
Background:
IIS 7
AspNet 3.5 web app
Chrome dev tools lists 98 requests for the home page of the web app (aspx + js + css + images). In following requests, status code is 200 for css/images files. No cache info, browser asks server each time if…
Francois
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