springboot 处理请求的小分支-跳转 & cookie

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首先是跳转，应该说设置状态，其中跳转是其中一个状态，

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@RequestMapping(value = "request1", method = RequestMethod.GET)
    public void request1(HttpServletRequest request, HttpServletResponse response) {
        response.setStatus(HttpServletResponse.SC_OK);
    }

200 状态就很简单，如果想做跳转可以使用 302 并设置 location

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@RequestMapping(value = "request2", method = RequestMethod.GET)
public void request2(HttpServletRequest request, HttpServletResponse response) {
    response.setHeader("Location", "https://baidu.com");
    response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
}

这里如果设置了 302，但没设置跳转 location，就是 302 found

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int SC_MOVED_TEMPORARILY = 302;
int SC_FOUND = 302;

而如果是 301 跳转，代表原地址不可用了，永久跳转

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@RequestMapping(value = "request3", method = RequestMethod.GET)
    public void request3(HttpServletRequest request, HttpServletResponse response) {
        response.setHeader("Location", "https://baidu.com");
        response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
    }

另一个问题是设置 cookie

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@RequestMapping(value = "request4", method = RequestMethod.GET)
    public void request4(HttpServletRequest request, HttpServletResponse response) {
        Cookie cookie = new Cookie("a", "b");
        response.addCookie(cookie);
        response.setStatus(HttpServletResponse.SC_OK);
    }

这样的设置就能成功设定 cookie，而随着目前的浏览器 cookie 策略，如果要跳转后设置的话，估计是会越来越难，包括

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response.addHeader("Set-Cookie", "a=b; domain=baidu.com; SameSite=none;Secure");

这样的方式也没法实现。