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The DiameterFactory class is used to create instances of [DiameterServletRequest|http://www.cipango.org/javadoc/diameter-2.0/org/cipango/diameter/api/DiameterServletRequest.html.
Cipango makes an instance of org.cipango.diameter.api.DiameterFactory available to servlets via the servlet context attribute of the same name, org.cipango.diameter.api.DiameterFactory.
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