src/server/pfs/s3/error.go
func invalidFilePathError(w http.ResponseWriter, r *http.Request) {
	writeError(w, r, http.StatusBadRequest, "InvalidFilePath", "Invalid file path")
}
func invalidFilePathError(w http.ResponseWriter, r *http.Request) {
	writeError(w, r, http.StatusBadRequest, "InvalidFilePath", "Invalid file path")
}
// note: this is not a standard s3 error