url insert /api
refactoring Router::mapResources() add option 'prefix'
rename webroot/sample <- files
IDE include_path
modify index() for Last-Modified header
add index() If-Modified-Since
rename _getDataModified() <- _getModified()
rename $dataModified <- $modified
extract _responseNotModified()
rename _responseNotFound() <- _error
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extract _checkModified()
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remove back link show()/hide()
refactoring move _checkModified()
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