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Home/ Questions/Q 3494844
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Editorial Team
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Editorial Team
Asked: May 18, 20262026-05-18T12:03:15+00:00 2026-05-18T12:03:15+00:00

Can some explain what the _ value is all about? This is what fiddler

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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

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  1. Editorial Team
    Editorial Team
    2026-05-18T12:03:16+00:00Added an answer on May 18, 2026 at 12:03 pm

    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).

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