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Definitions from the Web

last-modified-since

Part of speech: Phrase

Sense: A HTTP header field that is used to indicate the date and time at which the requested resource was last modified.

Usage:

- An important parameter in web development used for caching purposes.

- It allows web browsers to determine whether the cached version of a resource is still up-to-date or if it needs to be fetched from the server again.

Sample sentences:

1. The "last-modified-since" header can significantly improve the performance of a website by reducing unnecessary data transfers.

2. When a web page is requested by a browser, the server checks if the "last-modified-since" header is present and compares it with the resource's modification date.

3. If the resource has not been modified since the provided date in the "last-modified-since" header, the server responds with a 304 Not Modified status code.

Related products:

• HTTP headers explained
• Web development books
• Web caching solutions