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As a web developer, how do you take advantage of efficient revalidation? The browser automatically detects if a validation token has been previously specified, it appends the validation token to an outgoing request, and it updates the cache timestamps as necessary based on the received response from the server.
Large responses require many roundtrips between the client and server, which delays when they are available and when the browser can process them, and also incurs data costs for the visitor.
In the preceding example, the client automatically provides the ETag token in the "If-None-Match" HTTP request header.