If-Modified-Since

A request for the Apache Software Foundation logo (http://apache.org/img/asf_logo.png) that is part of loading http://apache.org/foundation/
asf logo

Initial request:


GET /img/asf_logo.png HTTP/1.1
Host: apache.org
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
Accept: image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36
Referer: http://apache.org/foundation/
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,ro;q=0.6

HTTP/1.1 200 OK
Date: Tue, 14 Apr 2015 22:40:52 GMT
Server: Apache/2.4.7 (Ubuntu)
Last-Modified: Tue, 14 Apr 2015 16:08:47 GMT
ETag: "751e-513b1721525d0"
Accept-Ranges: bytes
Content-Length: 29982
Cache-Control: max-age=3600
Expires: Tue, 14 Apr 2015 23:40:52 GMT
Keep-Alive: timeout=30, max=98
Connection: Keep-Alive
Content-Type: image/png

After expiration, if still located in local cache, browser will make a conditional request:

GET /img/asf_logo.png HTTP/1.1
Host: apache.org
Connection: keep-alive
Accept: image/webp,*/*;q=0.8
If-None-Match: "751e-513b1721525d0"
If-Modified-Since: Tue, 14 Apr 2015 16:08:47 GMT
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36
Referer: http://apache.org/foundation/
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,ro;q=0.6

HTTP/1.1 304 Not Modified
Date: Tue, 14 Apr 2015 22:42:51 GMT
Server: Apache/2.4.7 (Ubuntu)
Connection: Keep-Alive
Keep-Alive: timeout=30, max=100
ETag: "751e-513b1721525d0"
Expires: Tue, 14 Apr 2015 23:42:51 GMT
Cache-Control: max-age=3600