javascript - spring mvc + angularjs 400 错误

Question

大家好，碰到一个springmvc的400错误，不知道大家有什么解决方法
我的代码如下 ：

浏览器请求错误：

Answer 1

Remove @RequestParam otherwise param is not present

Answer 2

String inputVerCode = request.getParameter("inputVerCode");

Get it like this and give it a try

Answer 3

Try changing the value of Content-Type to x-www-urlencode