Details from Yahoo, Entity tags (ETags) are a mechanism web servers and browsers use to determine whether a component in the browser’s cache matches one on the origin server.
ETag headers identify whether the version of a resource cached in the browser is the same as the resource at the webserver. A visitor’s browser stores ETags.
When a visitor revisits a site, the browser compares each ETag to the one it stored. Matching values cause a 304 Not-Modified HTTP response that indicates the cached resource version is current.
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.
The problem with ETags is that they typically are constructed using attributes that make them unique to a specific server hosting a site. ETags won’t match when a browser gets the original component from one server and later tries to validate that component on a different server, a situation that is all too common on Web sites that use a cluster of servers to handle requests.
By default, both Apache and IIS embed data in the ETag that dramatically reduces the odds of the validity test succeeding on web sites with multiple servers.
How to Configure Entity Tags (ETags)
There are advantages and disadvantages of ETags.
Advantages of ETags (Single Server): Better caching and faster load times Lower server load
Disadvantages of ETags (Multiple servers): Slower load times and multiple caching of the same resource Higher server load
Ways to Configure Etags
There are two ways to fix ETags From Apache config From .htaccess
Configure entity tags (ETags) from Apache config
You need to have the root of your server or SSH access. Open your httpd.conf. To do this in Apache add the following lines to your configuration file.
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