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Caching in HTTP

ETAG

Res 200:

ETag: "fa6e-3e3073913b100"

Req:

If-None-Match: "fa6e-3e3073913b100"

Res 304:

ETag: "fa6e-3e3073913b100"

LAST MODIFIED

Res 200:

Last-Modified: Mon, 28 Jan 2013 22:29:45 GMT

Req:

If-Modified-Since: Mon, 28 Jan 2013 22:29:45 GMT

Res 304:

Last-Modified:Mon, 28 Jan 2013 22:29:45 GMT

EXPIRES

Res 200:

Expires: Tue, 19 Mar 2013 11:17:57 GMT

Do not try again before Tue, 19 Mar 2013 11:17:57 GMT

CACHE-CONTROL

Res 200:

Cache-Control: max-age=300

Do not try again until 5 minutes from now