What is Max-age in Cache-Control?
What is Max-age in Cache-Control?
Cache-control: max-age It is the maximum amount of time specified in the number of seconds. For example, max-age=90 means that a HTTP response remains in the browser as a cached copy for the next 90 seconds before it can be available for reuse.
How do I change my Cache-Control max-age?
Cache-Control: max-age= This directive tells the browser or intermediary cache how long the response can be used from the time it was requested. A max-age of 3600 means that the response can be used for the next 60 minutes before it needs to fetch a new response from the origin server.
What is Max stale?
The “max-stale” request directive indicates that the client is willing to accept a response that has exceeded its freshness lifetime. If max-stale is assigned a value, then the client is willing to accept a response that has exceeded its freshness lifetime by no more than the specified number of seconds.
What’s the difference between Cache-Control max-age 0 and no-cache?
When max-age=0 is used, the browser will use the last version when viewing a resource on a back/forward press. If no-cache is used, the resource will be refetched.
How long is Max-age 31536000?
one year
Max-age greater than 31536000 (one year) makes little sense, and informally this is considered a reasonable maximum value.
What is stale while revalidate?
The stale-while-revalidate attribute is used by the Cache-Control header and defines an extra window of time during which a cache (proxy, user agents) can use a stale asset while it revalidates it asynchronously. This improves subsequent page load latencies as stale assets are non longer in the critical path.
Which method is used to deal with stale cache problem is HTTP proxy?
must-revalidate HTTP allows caches to reuse stale responses when they are disconnected from the origin server. must-revalidate is a way to prevent this from happening – either the stored response is revalidated with the origin server or a 504 (Gateway Timeout) response is generated.
What is a stale response?
A cached response to an HTTP request that is older than max-age (expressed in seconds) is considered stale.
What is Cache-Control max age 31536000?
It’s standard practice to set a Cache-Control: max-age=31536000 on assets which are expected not to change, such as images. This header instructs the browser to cache the asset for 31536000 seconds, which is one year.
What is stale cache?
Stale cache is when the cache has an old copy of the data and needs to be. refreshed from the source (the source was modified since the cached copy. was read and last updated).
How is Web cache maintained?
A Web cache checks if the requested information is available in it local storage, if yes a reply is sent back to the user with the requested data; otherwise the cache forwards the request on behalf of the user to either another cache or to the origin remote server.
How long does a website stay cached?
If a user stops using the browser it is indefinitely. If he/she uses the browser rarely, it will be until the expiration – either by internal policy or by HTTP headers. If he/she uses the browser heavily, it can be 12 minutes or even less.
How do you deal with stale cache?
Dealing with stale data in in-memory caches
- Reading: client will first try to read from the cache. On cache miss, read from the database and put the data in the cache.
- Writing: Update the database first, followed by deleting the cache entry.
What is Cache-Control on HTTP response?
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 long is Max age 31536000?
How do you handle stale cache?
How do you prevent stale data in cache?
Stale data is an artifact of caching, in which an object in the cache is not the most recent version committed to the data source. To avoid stale data, implement an appropriate cache locking strategy. By default, EclipseLink optimizes concurrency to minimize cache locking during read or write operations.
How do you set up 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’.
What happens when cache expires?
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.
How do you use stale-while-revalidate?
stale-while-revalidate for the API
- When a request is sent to the API server endpoint for the first time, cache the response and then return it.
- The next time that same API request happens, use the cached response immediately.
- Then, send the request asynchronously to fetch a new response.