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The following page has been changed by DavidSchlotfeldt:
http://wiki.apache.org/cocoon/Action

The comment on the change is:
This document called HttpHeaderAction HTTPHeaderAction (capital TTP)

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   *  ResourceExistsAction : Check to see if a resource exists. Useful for 
conditional pipeline processing.
   *  The !FormValidatorAction, see FormValidationUsingCocoon
   *  !DatabaseAuthenticationAction : can automatically authenticate a user
-  *  HTTP!HeaderAction: adds HTTP headers to the response
+  *  Http!HeaderAction: adds HTTP headers to the response
   *  !RequestParamAction: request parameters are made available to sitemap
   *  !SendMailAction: sends an email
   *  Session* : various session related actions