#45 discuss
Mark Caudill

Ajax: decide on and add a "cache buster" option

Reported by Mark Caudill | July 16th, 2009 @ 08:28 AM

This will work simply by making the URI more unique with a randomized number similar to jQuery and others. This will be triggered if an option is set (defaults to on) and using GET.

Comments and changes to this ticket

  • Kit Goncharov

    Kit Goncharov July 16th, 2009 @ 04:23 PM

    • State changed from “new” to “open”

    Sounds good. I'd think just appending a unique ID to the end of the request would work, i.e.: key=value&key2=value2&_=1.

    I don't think the ID really has to be randomized — we could probably just declare var uniqueID = 1 in a closure, and then increment it every time an Ajax request is instantiated. jQuery uses +new Date() to create a unique ID — is there any benefit to using this over a basic incrementation?

    I'm not really sure if we need an option for this, though...

  • Kit Goncharov

    Kit Goncharov July 16th, 2009 @ 09:01 PM

    • Tag changed from ajax to ajax, discuss
  • John-David Dalton

    John-David Dalton August 3rd, 2009 @ 11:25 AM

    I agree and I like the idea. I also saw jQuery messing with expire headers as well.
    I am for an Id based on time and an increment because if the user refreshes the page and we just used an increment they would get cached data.

    We could have a based on time and if a new id matches an old id
    (say multiple ajax calls at once), then we increment them so they don't match the last id.

  • John-David Dalton

    John-David Dalton August 3rd, 2009 @ 05:25 PM

    Loads of info here https://developer.mozilla.org/En/Using_XMLHttpRequest

    important to this ticket is a section called "Bypassing the cache".

  • Mark Caudill

    Mark Caudill August 3rd, 2009 @ 07:15 PM

    The only problem with loadFlags is that there is no way to test without doing a browser sniff. John seems he wants to avoid browser sniffs, so the ultimate solution may be what jQuery is doing (and Firefox recommends doing for cross-browser compatible in the link JDD gave). They just use the _ variable and replace the _ variable if it is already present. I think _ is too simple of a variable to take over, but that's just my opinion on that one.

  • John-David Dalton

    John-David Dalton August 3rd, 2009 @ 10:13 PM

    We shouldn't use the _ underscore param because it causes issues with some environments.

    #9273 (Oracle App. Sever chokes on Ajax underscore parameter (Safari)) - Rails Trac - Trac

    Fuse actually removed the one that Prototype appends to its POST requests.
    The CHANGELOG entry explains it rather well.

    * Remove the "&_=" Safari 2 ajax bug workaround for the http PUT method. [Rails Trac #2258] [Prototype LH #327] [jddalton, Mark van Eijk, Shane Vitarana]
      Fixed in Rails by changeset http://dev.rubyonrails.org/changeset/2106.
    
  • Joe Gornick

    Joe Gornick September 19th, 2010 @ 05:51 PM

    • Milestone cleared.
    • Milestone order changed from “0” to “0”
  • Joe Gornick

    Joe Gornick September 29th, 2010 @ 09:47 AM

    • State changed from “open” to “new”
    • Assigned user changed from “Mark Caudill” to “John-David Dalton”
  • Joe Gornick

    Joe Gornick March 6th, 2011 @ 10:38 PM

    • State changed from “new” to “discuss”
    • Tag changed from ajax, discuss to ajax
    • Milestone order changed from “3” to “0”

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JavaScript frameworks share similar features and functionality such as DOM manipulation, event registration, and CSS selector engines. FuseJS attempts to incorporate the strengths of these frameworks into one stable, efficient, and optimized core JavaScript framework.

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