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ETag header

Lessons

ETag header

The page consists of dozens of files, and 95% of the files can be shared by all pages of the site. Caching was invented to avoid downloading this information every time.

There are 3 caching mechanisms:

  • The “cache-control” or “expires” headers indicate how long the content will be relevant. During this time, the user’s browser uses the saved copy of the file and does not make any requests to the server.
  • Caching via “etag”. The server generates a unique string based on the content and the user’s browser asks each time if the file has changed and provides this string.
  • The title is “Last-Modified”. The server reports the date of the last file change, and the browser asks each time if the file has changed since that time.

If the server does not provide the “etag” string, then the user’s browser will not be able to cache the file.

Instruction [How to set up caching] (/blog/apache_i_nginx_tyuning_bystrodeystviya).

◀  304 response code for caching The "Expires" header  ▶
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