Weird jQuery query string appended

Question

Can some explain what the "_" value is all about? This is what fiddler is showing me for my MVC 3 page that has a jQuery ajax call on the client.

GET /Services/GetFoodDescriptionsLookup(100)?_=1291727469299 HTTP/1.1

When the URL is constructed in this fashion I don't get back any data, but if I type

GET /Services/GetFoodDescriptionsLookup(100)

this works..

Thank you, Stephen

That looks very much like a timestamp added to prevent caching. — Pekka
– Pekka, Commented Dec 7, 2010 at 13:23
I should clarify that I am getting data back so as not to confuse anyone more than I already am.. :) — Stephen Patten
– Stephen Patten, Commented Dec 7, 2010 at 13:45

Victor Nicollet · Accepted Answer · 2010-12-07 13:23:47Z

6

It's added by jQuery to prevent caching when cache:false is set. This is basically a workaround for IE's over-eager caching that will not resubmit an AJAX GET request (unless the caching policy is extremely well-configured).

answered Dec 7, 2010 at 13:23

Victor Nicollet

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1 Comment

Nick Craver Over a year ago

+1 - I'll add that IE might also choose to cache the hell out of it even when it's configured perfectly.

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