Examples of using Cache-control in English and their translations into Japanese
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Cache-Control support limitations.
Difference between Pragma and Cache-control headers?
Figure 8. Cache-Control directives.
For example, on responses from backend targets, Edge supports the Cache-Control header.
Figure 1. Cache-Control information from RedBot.
The Vary header is used on 39% of HTTP responses,and 45% of responses that include a Cache-Control header.
Set cache-control for entire S3 bucket automatically(using bucket policies?).
Max-age is used by almost 75% of Cache-Control headers, and no-store is used by 18%.
The Cache-Control general-header field is used to specify directives that MUST be obeyed by all caching mechanisms along the request/response chain.
When a response is not cacheable, the Cache-Control no-store directive should be used.
Using Cache-Control HTTP directives, you get the ability to fine-tune the various cache mechanisms between your server and the client's browser.
Figure 9 above illustrates the top 15 Cache-Control directives in use on mobile websites.
If the request has been made by using the header If-None-Match This information is returned via the header Etag andthe policy max-age header Cache-Control Respectively.
HTTP/1.1 introduced the Cache-Control header, and most modern clients support both headers.
The following tabledescribes Apigee Edge support for HTTP Cache-Control response header directives.
Apigee Edge supports a subset of Cache-Control response header capabilities defined in the HTTP/1.1 specification.
Note: Cache-Control is also a header you can specify in your HTTP requests for an object; however, Cloud Storage ignores this header and sets response Cache-Control headers based on the stored metadata values.
For more information about Cache-Control directives, see RFC 7234: Cache-Control.
The most common is the Cache-Control header which specifically determines how long something can be cached before returning to the origin to ensure it is up-to-date.
Note that HTTP/1.0 caches might not implement Cache-Control and might only implement Pragma: no-cache(see Pragma).
For example, if the Cache-Control header is returned from a backend server, you can have the header's s-maxage directive potentially override other expiration settings in the policy.
NOTE: For more information on the rest of the Cache-Control headers, see the relevant section in Mark Nottingham's Caching Tutorial.
Controlling caching The Cache-control header The Cache-Control HTTP/1.1 general-header field is used to specify directives for caching mechanisms in both requests and responses.
If an HTTP/1.1 cache receives such a response,and the response does not include a Cache-Control header field, it SHOULD consider the response to be non-cacheable in order to retain compatibility with HTTP/1.0 servers.
Apigee Edge supports the Cache-Control header only on responses returned from backend origin servers(the HTTP/1.1 spec allows Cache-Control headers in both client requests and origin server responses).
SetControl() sets an array of Cache-Control header directives all at once; alternatively, use the individual directive methods:.
Except for when the Cache-Control header is set to private, the Surrogate-Control header takes priority over Cache-Control, but unlike Cache-Control it is stripped so the browsers don't see it.
The best way todo this would be to send Fastly both the Cache-Control header as you want it to go to the browsers, and use Surrogate-Control to tell us how long to cache for. For example:.
One way to avoid this is to use the Cache-Control private directive, which only permits the response to be cached by the client browser.
Fastly builds on the behavior proposed in RFC 5861"HTTP Cache-Control Extensions for Stale Content" by Mark Nottingham, which is under consideration for inclusion in Google's Chrome browser.