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How can you control the expiration and invalidation of client-side cached data?

Revati S Misra 711 24 May 2023

How can you control the expiration and invalidation of client-side cached data?

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Updated 25 May 2023
Revati S Misra
Revati S Misra

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Skilled in SEO, content writing, and digital marketing. Completed several years of working in many organizations including multinational companies. I love to learn new things in life that keep me motivated.

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1 Answers

Aryan Kumar
Aryan Kumar 25 May 2023
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Various mechanisms and techniques can be used to control expiration and invalidation of client-side cached data. Here are some commonly used approaches:

  1. Cache control header:
    The server can include her Cache-Control header in the response to instruct the client how to cache the data. The headers include "max-age" to specify the maximum time that data is considered fresh, "no-cache" to force revalidation by the server before using cached data, and "no Specify a directive such as -store. .
  2. ETag (entity tag):
    An ETag is an identifier that the server assigns to a specific version of a resource. The server can include her ETag in the response header and the client can send her ETag back on subsequent requests using the "If-None-Match" header. If the resource has not changed (indicated by a matching ETag), the server responds with a 304 status code, indicating that the client can use its cached copy.
  3. Last modified header:
    The server MAY include a "Last-Modified" header in the response that indicates the timestamp of when the resource was last modified. The client can save this timestamp and send it back to the server in subsequent requests using the "If-Modified-Since" header. If the resource has not changed since that timestamp, the server will respond with his 304 status code, indicating that the client can use its cached copy.
  4. version control:
    Include the version number or unique identifier in the resource URL. When a resource is updated, its URL changes so clients request the latest version instead of relying on a cached copy.
  5. Cache invalidation:
    Modify the resource URL by adding a query parameter or version number. This technique ensures that the client gets the new version of the resource because the URL is different from the cached URL.
  6. Explicit cache invalidation:
    Provide an API or mechanism for the server to explicitly notify the client to invalidate cached data. This can be accomplished through custom cache-busting headers, webhooks, or other communication methods. 

It is important to note that controlling client-side caching requires coordination between the server and client. The server MUST provide appropriate cache-related headers, and the client MUST interpret these headers correctly in response. Additionally, different browsers and caching systems may have their own caching behavior and configuration options. Therefore, it is important to consider the specific environment in which the application will be deployed. 

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