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I read a few posts attaching ?pfdrid_c=true attribute to a pdf object. What is it for and why would I use that. Related posts using this attribute:

Primefaces <p:graphicImage /> is throwing undefined function

JSF Load uploaded images from nested subfolders

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Martijn Burger
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    According [to this](http://www.primefaces.org/docs/api/4.0/index.html?constant-values.html) that parameter sets `DYNAMIC_CONTENT_CACHE_PARAM`. According [to this](http://primefaces.googlecode.com/svn/primefaces/trunk/src/main/java/org/primefaces/application/PrimeResourceHandler.java) that variable is used to control the `Cache-Control`, `Expires` and `Pragma` headers. – Chris Haas Jun 23 '14 at 18:26

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According to this that parameter sets DYNAMIC_CONTENT_CACHE_PARAM. According to this that variable is used to control the Cache-Control, Expires and Pragma header

Martijn Burger
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