Encountered a thorny problem, many interface parameters do not do verification, is completely front-end or the previous interface to what, what to use. In this case, the interface loses its own reliability and robustness. Once there is a problem with the previous interface or a small link of the app, the problem will eventually produce a big bug, resulting in the failure of the whole function or even dirty data and user data damage. If you ask the background, the background will probably say, normally there is no problem, and if there is a problem, it is a bug in the app or the previous interface, so there is no checksum repair for this interface. But a good test is one that anticipates bugs and suggests improvements and preventive measures, rather than just finding bugs and throwing them at development. Suggest if time enough, so will advise the development validation, although each interface coupling between is inevitable, but we can strengthen the validation, and exception handling, to reduce the damage of the coupling, as the national airports are physical examination, we inevitably have bird flu, foreign entry, but we can avoid patients rather than inaction, After waiting for the domestic people to suffer, the blame to foreign countries, said that they did not cure, did not control the virus.