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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.
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Query parameter name: As you can imagine, a query parameter name is a single entity. Since it's one name, using an underscore makes sense here. It's no surprise that the common UTM parameters such as utm_campaign, utm_medium, utm_source, utm_content and utm_term use underscore instead of a dash.
Consider using hyphens to separate words in your URLs, as it helps users and search engines identify concepts in the URL more easily. We recommend that you use hyphens ( - ) instead of underscores ( _ ) in your URLs.
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
It could be the JQuery CacheBuster parameter.
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