What does Cache-Control public mean?
By using cache-control:private, you are specifying that it shouldn’t cache the page (but allowing the final user to do so). If you use cache-control: public, you are saying that it’s okay for everyone to cache the page, and so the proxy would keep a copy.
What is Cache-Control max-age?
Cache-Control: Max-Age After expiring, a browser must refresh its version of the resource by sending another request to a server. For example, cache-control: max-age=120 means that the returned resource is valid for 120 seconds, after which the browser has to request a newer version.
What is cache expiration?
When the Expires date is equal to the Date header value, the response is considered to be expired. When a response has an Expires header field with a date/time that is in the future, then that response is considered “cacheable”. Servers should not set an Expires date that is more than one year in the future.
What does cache control private mean?
Cache-Control: private. Indicates that all or part of the response message is intended for a single user and MUST NOT be cached by a shared cache, such as a proxy server.
What happens if you don’t set cache control header?
Without the cache control header the browser requests the resource every time it loads a new(?)
What is Max-age in headers?
max-age. The max-age directive states the maximum amount of time in seconds that fetched responses are allowed to be used again (from the time when a request is made). For instance, max-age=90 indicates that an asset can be reused (remains in the browser cache) for the next 90 seconds.
How do you use Cache-Control?
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’.
How do I turn off private Cache-Control?
1 Answer
- Open your IIS Manager, navigate to the level you want to manage.
- In Features View, Double click “HTTP Respond Headers” feature.
- Click “Add…” on the Actions Panel.
What sets how long a page will be cached on a browser before it expires?
The Expires property sets how long (in minutes) a page will be cached on a browser before it expires. If a user returns to the same page before it expires, the cached version is displayed.
Is Cache-Control private safe?
It is meant for the end user, and no one else. FYI, the RFC makes clear that this does not provide security. It is about showing the correct content, not securing content. This usage of the word private only controls where the response may be cached, and cannot ensure the privacy of the message content.
Is cache-control public by default?
The max-age directive on a response implies that the response is cacheable (i.e., “public”) unless some other, more restrictive cache directive is also present.
What is cache-control must revalidate?
The must-revalidate response directive indicates that the response can be stored in caches and can be reused while fresh. If the response becomes stale, it must be validated with the origin server before reuse. Typically, must-revalidate is used with max-age . Cache-Control: max-age=604800, must-revalidate.
How can I tell how old my cache is?
Chrome: Navigate to chrome://cache . Note that there’s a key for each cache entry (requested URL). Associated with the key, you will find the whole response details (status codes, headers and content). With those details, the browser is able to determine the age of a requested resource and whether it’s expired or not.
What is stale while revalidate?
stale-while-revalidate helps developers balance between immediacy—loading cached content right away—and freshness—ensuring updates to the cached content are used in the future. stale-while-revalidate and the max-age parameters can be set in the Cache-Control of the HTTP response header.
How do I enable 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 the difference between Cache-Control and expires?
To sum up though, Expires is recommended for static resources like images and Cache-Control when you need more control over how caching is done. It’s worth commenting that cache-control is what all browsers will use, but it’s useful to specify both headers just in case there are old proxies in the way.
What is the difference between standard and extension cache control?
Standard Cache-Control directives that can be used by the client in an HTTP request. Standard Cache-Control directives that can be used by the server in an HTTP response. Extension Cache-Control directives are not part of the core HTTP caching standards document.
What is the difference between public and private cache control?
Cache-Control: Public. The public response directive indicates that a resource can be cached by any cache. Cache-Control: Private. The private response directive indicates that a resource is user specific—it can still be cached, but only on a client device.
What is a cache-control header and how does it work?
A cache-control header can appear in both HTTP requests and responses. What’s in a cache-control header? Headers consist of key-value pairs which are separated by a colon. For cache-control, the ‘key’, or the part to the left of the colon, is always ‘cache-control’.