Who Add "_" Single Underscore Query Parameter?

php javascript ajax apache http
ZZ Coder picture ZZ Coder · Sep 10, 2010 · Viewed 28.4k times · Source

I have a PHP server running on Apache, I get lots of request looks like this,

10.1.1.211 - - [02/Sep/2010:16:14:31 -0400] "GET /request?_=1283458471913&action=get_list HTTP/1.1" 200 547 0 "http://www.example.com/request" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8 (.NET CLR 3.5.30729)" 28632 15602

The _ parameter is mysteriously added to the request. I am trying to find out who is doing that.

There is a NetScaler running in front of Apache.

Answer

Patricia picture Patricia · Sep 10, 2010

jQuery adds a parameter like that to get around IE's caching.

edit: it only adds it for get requests, and only if the option cache is false:

cache: false

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