Configuring Atmosphere using the web.xml or atmosphere.xml - Atmosphere/atmosphere GitHub Wiki
The following elements can be utilized to configure your Atmosphere's application via your web.xml or your atmosphere.xml.
<init-param>
<param-name>NAME</param-name>
<param-value>VALUE</param-value>
</init-param>
<applicationConfig>
<param-name>NAME</param-name>
<param-value>VALUE</param-value>
</applicationConfig>
See this page for a list of properties.