CORS Missing Allow Origin

自用小总结

问题出现背景：前后端交互
问题描述：脚本无法获取响应主体（原因：CORS Missing Allow Origin
问题分析：前后端交互数据形式不匹配
自我检查：用 postman 检查后端接口是否能用，排除前端和后端其中一个
尝试更改
1. 前端是form-data / x-www-form-urlencoded数据，后端则需要使用@RequestParam

2. 前端是application/json数据，后端则需要使用@RequestBody

3. 后端尝试添加

1. , HttpServletResponse response
2. response.setHeader("Access-Control-Allow-Origin", "*");位置在controller里面 ，例如 ：
@PostMapping("/login")
public Result<User> loginController(@RequestParam String uname, @RequestParam String password, HttpServletResponse response){User user = userService.loginService(uname, password);if(user!=null){response.setHeader("Access-Control-Allow-Origin", "*");return Result.success(user,"登录成功！");}else{return Result.error("123","账号或密码错误！");}}

4.前端请求添加请求头

 this.axios({url: "/user/login",               // 请求地址method: "post",                   // 请求方法headers: {                         // 请求头"Content-Type": "application/json",},params: {                          // 请求参数uname: this.ruleForm.uname,password: this.ruleForm.password,},})

5.前端请求参数：应该是paramse 还是 data，是否与后端接收 controller 相匹配

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CORS Missing Allow Origin

自用小总结

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