Who Add "_" Single Underscore Query Parameter?

user_149808 0
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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.

apache http php ajax javascript
5 Answers

Ajax tools, like jQuery, is able to ask the browser not to cache the requested result, so every request from the loaded web page will travel to web server and get the newest response.

In order to achieve that, set cache flag as false, then an additional query parameter, like _=1234567890, is appended into the request URL. Of course the number is always changing, so the browser thinks it as a brand-new request and won't provide any cached things.

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