编码的时候偷懒，复制controller层上一段的代码忘记改Controller注解的RequestMapping，这个报错说某个RequestMapping有歧义，模糊不清，基本就是说有重复的RequestMapping了，这是检查下controller层的代码看看是否有重复的RequestMapping注解
编码的时候偷懒，复制controller层上一段的代码忘记改Controller注解的RequestMapping，这个报错说某个RequestMapping有歧义，模糊不清，基本就是说有重复的RequestMapping了，这是检查下controller层的代码看看是否有重复的RequestMapping注解
![错误502 upstream sent too big header while reading response header from upstream[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)