无车优化，自有车接口返回

src/main/java/com/jkcredit/invoice/credit/interserver/CustomerInterLowerServiceImpl.java

@@ -38,7 +38,7 @@ public class CustomerInterLowerServiceImpl implements CustomerInterLowerService
     @Autowired
     CustomerRecMapper customerRecMapper;
 
-    private static final String PDF = "PDF";
+    private static final String PDF = "pdf";
 
 
     /**