Node.js的＆安培;防爆preSS路由与参数 [英] Node.js & Express routing with parameters

问题描述

我目前在node.js中2路线的API我建立。它们是：

I currently have 2 routes in node.js for an API I am building. They are:

app.get('/api/v1/user/:userid', function (req, res) {
    return res.status(200).json(GetUser());
});

和

app.get('/api/v1/user', function (req, res) {
    return res.status(400).json('UserId expected');
});

正如你所看到的，两条路线实际上应该被合并成一个，例如：

As you can see, both routes actually should be combined into one, for example:

app.get('/api/v1/user/:userid', function (req, res) {
    console.log('this should still show if :userid is not populated, but it does not');

    if(!req.params.userid)
        return res.status(400).json('UserId expected');

    return res.status(200).json(GetUser());
});

然而，当我测试与邮差上面的端点，而无需在：指定用户ID ，我会得到一个超时。显然，如果我提供一个：用户ID ，我得到了相应的用户

However, when I test the above endpoint with Postman without the :userid specified, I will get a timeout. Obviously if I supply an :userid, I get the corresponding user.

另外我发现，的console.log 将永远不会在终端显示当：用户ID ISN Ť规定。这是我的端子输出：

Also I have found that the console.log will never show up in the terminal when :userid isn't specified. This is my terminal output:

this should still show if :userid is not populated, but it does not
GET /api/v1/user/56a6861675774c1a046bf780 200 3.140 ms - 274
GET /api/v1/user/ - - ms - -

所以，上述所有使我相信，由于：用户ID 是未定义或空，它打破了前preSS中间件。是假设是正确的，我如何克服它？

So all the above leads me to believe that because the :userid is undefined or null, that it is breaking the express middleware. Is that assumption correct and how do I overcome it?

推荐答案

的假设是正确的。对于定义的处理程序 / API / V1 /用户/：USER_ID 不能用于 / API / V1 /用户。因此，该航线 / API / V1 /用户/ 将无法办理'GET'请求。

The assumption is correct. The handler defined for /api/v1/user/:user_id cannot be used for /api/v1/user. As such, the route /api/v1/user/ will be unable to handle 'GET' requests.

您需要定义不同的处理程序为不同的路线。

You need to define different handlers for the different routes.

一个解决方案是使用前preSS路由器中间件来定义你的路由。

A solution would be to use Express router middleware to define your routes.

var router = express.Router();
router.route('/api/v1/user')
  .get(); // define handler for multiple resources here.

router.route('/api/v1/user/:user_id')
  .get(); // define handler for single resource here.

app.use('/', router);

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