How to cache a different page version based on HTTP header?

1. How do I set cache control HTTP header?
2. Are HTTP headers cached?
3. What is Cache Control HTTP header?
4. How do you cache static resources using HTTP caching?
5. How does HTTP cache work?
6. What is vary header?
7. How long does CloudFront cache take?
8. How long does a browser cache last?
9. What is default cache-control?
10. Where do I put cache-control?
11. What is Pragma cache-control?
12. What is Cache request?

How do I set cache control HTTP header?

To use Cache-Control headers, choose Content Management | Cache Control Directives in the administration server. Then, using the Resource Picker, choose the directory where you want to set the headers. After setting the headers, click 'OK'.

Are HTTP headers cached?

Every resource can define its own caching policy via the Cache-Control HTTP header. ... The HTTP specification enables the server to send several different Cache-Control directives which control how and for how long individual responses are cached by browsers among other intermediate caches such as a CDN.

What is Cache Control HTTP header?

Cache-control is an HTTP header used to specify browser caching policies in both client requests and server responses. Policies include how a resource is cached, where it's cached and its maximum age before expiring (i.e., time to live).

How do you cache static resources using HTTP caching?

Here is what you need to remember while caching static resources on CDN or local cache server:

1. Use Cache-control HTTP directive to control who can cache the response, under which conditions, and for how long.
2. Configure your server or application to send validation token Etag.
3. Do not cache HTML in the browser.

How does HTTP cache work?

Overview. HTTP caching occurs when the browser stores local copies of web resources for faster retrieval the next time the resource is required. As your application serves resources it can attach cache headers to the response specifying the desired cache behavior.

What is vary header?

The Vary HTTP response header determines how to match future request headers to decide whether a cached response can be used rather than requesting a fresh one from the origin server. The Vary header should be set on a 304 Not Modified response exactly like it would have been set on an equivalent 200 OK response. ...

How long does CloudFront cache take?

Short description. By default, CloudFront caches a response from Amazon S3 for 24 hours (Default TTL of 86,400 seconds). If your request lands at an edge location that served the Amazon S3 response within 24 hours, then CloudFront uses the cached response even if you updated the content in Amazon S3.

How long does a browser cache last?

The response can be cached by browsers and intermediary caches for up to 1 day (60 seconds x 60 minutes x 24 hours). The response can be cached by the browser (but not intermediary caches) for up to 10 minutes (60 seconds x 10 minutes). The response can be stored by any cache for 1 year.

What is default cache-control?

The default cache-control header is : Private. A cache mechanism may cache this page in a private cache and resend it only to a single client. This is the default value. Most proxy servers will not cache pages with this setting.

Where do I put cache-control?

To use cache-control in HTML, you use the meta tag, e.g. The value in the content field is defined as one of the four values below. HTTP 1.1. Allowed values = PUBLIC | PRIVATE | NO-CACHE | NO-STORE.

What is Pragma cache-control?

"The Pragma: no-cache header field is an HTTP/1.0 header intended for use in requests. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource, not for the server to tell the browser not to cache the resource.

What is Cache request?

Caching is a technique that stores a copy of a given resource and serves it back when requested. When a web cache has a requested resource in its store, it intercepts the request and returns its copy instead of re-downloading from the originating server.