The first lik for leter L is: https://www.logicbig.com/quick-info/web/etag-heade

Question

The first lik for leter L is: https://www.logicbig.com/quick-info/web/etag-header.html

The second link for letter L is: https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching

The third link for letter L is: https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching

The video link for letter L is:  https://www.youtube.com/watch?v=XXiamIsYBos

The link on the letter M is: https://www.w3.org/2005/MWI/BPWG/techs/CachingWithETag.html

The second link on the letter M is:  http://www.pocketsoap.com/weblog/stories/2002/05/0015.html

4. The HTTP RESPONSE message (Total 60 points) Consider the figure above, where the server is sending a HTTP RESPONSE message back the client Suppose the server-to-client HTTP RESPONSE message is the following HTTP/1.1 200 OK Date: Mon, 25 Feb 2018 18:00:00 +0000 Server: Apache/2.2.3 (CentoS) Last-Modified: Thu, 01 Feb 2018 18:00:00 +0000 ETag: "12345-abc-67890" Content-Length: 2635 Keep-Alive: timeout-23, max-10 Connection: Keep-alive Content-type: text/html

Explanation / Answer

The ETag is quite significant.It is kind of an unique id provided by a web server to a particular version of a resource found at a URL. If the resource changes at that URL, a different ETag is assigned.In case the server gets the request of a URL and the Etag matches it means it need not send the page again to the client saving the bandwidth as the resource has not been modified and client is having the latest version of the requested resource.

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