Configure Entity Tags (ETags)

8/19/2014 4:02:13 PM

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If you have ever used the YSlow ( to analyze the web page to improve the performance, you may have experienced with “Configure ETags” alert. Entity tags (ETags) are a mechanism web servers and the browser use to determine whether a component in the browser’s cache matches one on the origin server. Since ETags are typically constructed using attributes that make them unique to a specific server hosting a site, the tags will not match when a browser gets the original component from one server and later tries to validate that component on a different server.