apache tutorial - How to disable entity tags (ETags) - apache - apache web server - apache server - apache2

Entity tags

  • Entity tags (ETags) are used in HTTP headers to manage web caching behavior.
  • They provide a way for web clients to determine if their cache content matches the content on the web server.
  • If the entity tags for a particular resource (such as an image file) do not match, the web client sends a request to the server to download the most recent version.
  • By default, entity tags are enabled on your hosting account. However, there may be scenarios where you do not want to send entity tag headers.
  • For example, you might want to disable entity tags during site development or to test web caching.

Disabling entity tags

  • To disable sending entity tags in the HTTP headers, add the following two lines to an .htaccess file in your account's public_html directory:
Header unset ETag
FileETag None
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  • The changes take effect immediately. To re-enable entity tags, comment out or delete the two lines in the .htaccess file.
  • To verify the entity tag settings in the .htaccess file are working correctly, examine the raw HTTP headers sent between the browser and web server.
  • To do this, use a browser plugin that displays the raw headers such as Live HTTP headers for Mozilla Firefox, or the Developer Tools feature in Google Chrome.

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