Thanks, I am now trying to figure out how to get the date time stamp from an object in cache, so that I could use it to compare with the IMS header of the request from browser. Any idea/ pointers? Thanks.
- Neel On Fri, 01 Oct 2010 09:45:05 +0530 Ask Bjørn Hansen wrote > >On Sep 30, 2010, at 20:06, Indranil Chakravorty wrote: > >> I have been mulling over the feasibility of implementing conditional requests between the client browser and varnish cache. > >You are in luck - that already works. :-) > >And yes - all common browsers support this. You can combine a short-ish Cache-Control maxage header with a longer cache time in Varnish to get some control of how long content is cached for. > > > - ask > >First request (get Last-Modified for the next request) ============ > >[...@embla ~]$ curl -svo/dev/null http://www.pool.ntp.org/en/ >* About to connect() to www.pool.ntp.org port 80 (#0) >* Trying 207.171.3.6... connected >* Connected to www.pool.ntp.org (207.171.3.6) port 80 (#0) >> GET /en/ HTTP/1.1 >> User-Agent: curl/7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8l zlib/1.2.3 >> Host: www.pool.ntp.org >> Accept: */* >> >* HTTP 1.0, assume close after body >< HTTP/1.0 200 OK >< Server: Apache/2.2.3 (Red Hat) mod_apreq2-20051231/2.6.1 mod_perl/2.0.4 Perl/v5.8.8 >< X-UA-Compatible: IE=8 >< P3P: CP="NOI DEVo TAIo PSAo PSDo OUR IND UNI NAV", policyref="/w3c/p3p.xml" >< Last-Modified: Fri, 01 Oct 2010 04:13:06 GMT >< Vary: Accept-Encoding >< Keep-Alive: timeout=30, max=100 >< Content-Type: text/html; charset=utf-8 >< Content-Length: 14214 >< Date: Fri, 01 Oct 2010 04:14:27 GMT >< X-Varnish: 946925222 946924396 >< Age: 81 >< Via: 1.1 varnish >* HTTP/1.0 connection set to keep alive! >< Connection: keep-alive >< X-Served-By: ntplax2.ntppool.net >< X-Cache: HIT >< X-Cache-Hits: 298 >< >{ [data not shown] >* Connection #0 to host www.pool.ntp.org left intact >* Closing connection #0 > > >IMS request ============== > > >[...@embla ~]$ curl -H 'If-Modified-Since: Fri, 01 Oct 2010 04:13:06 GMT' -svo/dev/null http://www.pool.ntp.org/en/ >* About to connect() to www.pool.ntp.org port 80 (#0) >* Trying 207.171.3.6... connected >* Connected to www.pool.ntp.org (207.171.3.6) port 80 (#0) >> GET /en/ HTTP/1.1 >> User-Agent: curl/7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8l zlib/1.2.3 >> Host: www.pool.ntp.org >> Accept: */* >> If-Modified-Since: Fri, 01 Oct 2010 04:13:06 GMT >> >< HTTP/1.1 304 Not Modified >< Date: Fri, 01 Oct 2010 04:14:31 GMT >< Via: 1.1 varnish >< X-Varnish: 946925256 >< Last-Modified: Fri, 01 Oct 2010 04:13:06 GMT >< Vary: Accept-Encoding >< Connection: keep-alive >< X-Served-By: ntplax2.ntppool.net >< X-Cache: HIT >< X-Cache-Hits: 313 >< >* Connection #0 to host www.pool.ntp.org left intact >* Closing connection #0 > >
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