set action name to request, this is usually used by custom router to set route result controller name.
Parameter-Liste
action
String, action name, it should in lower case style, like "index" or "foo_bar"
format_name
this is introduced in Yaf 3.2.0, by default Yaf will format the name into lower case style,
if this is set to false , Yaf will set the original name to request.