... 16: HTTP Headers for Optimal Performance In http_protocol.c, the Date header is set according to $r->request_time. A mod_ perlscript can read, but not change,$r->request_time.Last-Modified ... Associates, Inc. All rights reserved.540|Chapter 16: HTTP Headers for Optimal Performance lots of requests to retrieve the same content before it changes again, and if it is muchcheaper to test ... 16CHAPTER 16HTTP Headers for Optimal Performance Header composition is often neglected in the CGI world. Dynamic content is dynamic,after all, so why would anybody care about HTTP headers? Because...