Web Application Performance

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HTTP headers

  • Cache-Control: max-age
  • ETag: Hash of file, don't download if unchanged (but beware of how this is calculated, e.g. Apache may use inodes by default which differ on load-balanced servers)
  • Expires: Re-download after this
  • Last-Modified

Most headers won't help on first visit.

Request headers:

  • If-Modified-Since: Date/time
  • If-None-Match: Hash (ETag)
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