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An engineer is developing a client/server application for use by a very large number of clients. The engineer must optimize the application response time and lower the required network bandwidth when clients access the server. The engineer wants the server responses to be based on the resource version fetched by the clients. Which HTTP technique must be used?
Correct Answer: A
Conditional requests optimize response time and reduce network bandwidth usage by allowing the server to respond based on whether the requested resource has changed since the client last fetched it. This is done using HTTP headers such as: If-None-Match(used with ETagvalues): The server checks if the resource has changed and returns a 304 Not Modified status instead of resending the full content. If-Modified-Since: The server only sends the resource if it has been modified since the specified date.