On Fri, 26 Jun 2009 03:42:17 +0100 Amos Jeffries <squid3@xxxxxxxxxxxxx> wrote: >londoner1@xxxxxxxxxxxx wrote: >> On Thu, 25 Jun 2009 05:44:24 -0700 Amos Jeffries >> <squid3@xxxxxxxxxxxxx> wrote: >>> londoner1@xxxxxxxxxxxx wrote: >>>> Hi, >>>> >>>> I am trying to setup a local squid cache on my laptop so that >I >>> can >>>> browse intranet pages when I am on a plane and don't have >>> network >>>> connection. >>>> >>>> I am therefore using the squid offline_toggle option via the >>>> 'squid3client mgr:offline_toggle' command. >>>> >>>> However, I am finding that pages are not being cached when I >>> have >>>> my Office proxy set as a parent to my local one. >>>> >>>> I am running ubuntu hardy with squid 3 STABLE.1 ubuntu package > >>> on >>>> my local machine, with a parent proxy set using the following >>> lines >>>> in my squid.conf: >>>> >>>> cache_peer proxy.nectech.co.uk parent 8080 0 no-query >>>> prefer_direct off >>>> >>>> PS: The above two lines came from Squid wiki here: >>>> http://wiki.squid-cache.org/SquidFaq/ConfiguringSquid#head- >>>> c050a0a0382c01fbfb9da7e9c18d58bafd4eb027 >>>> >>>> My approach to test this is as follows: >>>> >>>> 1 Set firefox to my localhost:3128 proxy >>>> 2 Start squid in online mode and browse to a website. >>>> 3 Close firefox >>>> 4 Set local squid into offline mode using 'squid3client >>>> mgr:offline_toggle' >>>> 5 Pull out the Network cable (to simulate being on a plane) >>>> 6 Reopen firefox and browse to same site as in step 2. >>>> >>>> After step six, the page does not load and eventually times >out. >>>> >>>> If i take out the parent cache lines, the offline mode will >>> work. >>>> Please can anyone help? >>> 'offline_mode' means that Squid no longer attempts page >validation >>> and >>> fetching of new pages. It does not means supplying content >known >>> to be >>> past expiry. >> >> Hi Amos, >> >> Ok, please forgive me if I dont understand you correctly: you >are >> saying that the local squid cache is NOT returning me the page >that >> i previously went to a few minutes ago because it thinks it has >> expired? > >Yes. From the info provided I believe that is what is happening. > >> >> why would it be expired that quickly? and yet not be expired if >my >> local squid cache does not use the parent cache? > >HTTP contains things called If-Modified-Since requests. When squid > >thinks something is expired it either uses them or a new request >to >check for new content. Sometimes an IMS request sens back "no >hasn't >chaged" so Squid updates its information and sends you the object >again. > >It's probably that the HTML part of the page has a short expiry >time but >does not actually change (ie a dynamically created page). > >Even if all the images etc on the page are available for months, >without >an HTML part to say how they are displayed the page wont show up. > Thanks Amos, I understand now. > >> >> Also, a poster on the following blog mentioned that squid >offline >> mode ignores expiry data for cached items when in offline mode. >Is >> this not the case in latest squid 3 versions? >> >> http://people.w3.org/~dom/archives/2006/09/offline-web-cache- >with- >> squid/ >> >> ps I appreciate your help on the subject. > >Mark who replied there and others have made a lot of improvements >to the >expiry and IMS sections of the latter Squid 2.6 releases and 2.7. > >The Squid-3 code in the same areas is a lot older with not all of >their >changes ported over. So I believe it would behave differently. >Though >I'm not fully clued up on the finer grains of whats going on >there. Ok, so I will try the latest stable 2.6 /2.7 builds on squid and see what behaviour is in those builds. Thanks for your help. londoner1 > >Amos >-- >Please be using > Current Stable Squid 2.7.STABLE6 or 3.0.STABLE16 > Current Beta Squid 3.1.0.8 -- Easy-to-use, advanced features, flexible phone systems. Click here for more info. http://tagline.hushmail.com/fc/BLSrjkqmC5st0oAPQKnBr7VIGiuzxgDlzcAU23eNkHSF3JMG5yELn1NVDZe/
