City Search We want to create an endpoint that we can use to filter cities. Follow the tasks below to to create this new route. Create a new route for GET request to '/cities'. The second argument should be a callback function which takes request and…

Route Instance Let's rewrite our cities routes using a Route Instance. Create a new Route Instance for the '/cities' URL path and assign it to thecitiesRoute variable. var citiesRoute = app.route('/cities'); Move the code from our previous app.get() …

Parser Setup Assume the body-parser middleware is installed. Now, let's use it in our Express application. npm install body-parser Require the body-parser npm module and assign it to a variable calledbodyParser. var bodyParser = require('body-parser'…

Mounting Middleware Given an application instance is set to the app variable, which of the following function calls would you use to mount a middleware called logger ? Answer: app.use(logger); Default Middleware What is the only middleware that's shi…

Installing Express Let's start building our new Express application by installing Express. Type the command that installs the latest version for the 4.9 branch. npm install express@4.9 The '@' symbol to tell the npm which express version you want to…

今天我们来聊一聊Low level discovery这个功能,我们为什么要用到loe level discovery这个功能呢? 很多时候,在使用zabbix监控一些东西,需要对类似于Itens进行添加,这些items具有一些共同特性, 如果说某些特定的参数是变量,而其他设置都一样,例如:一个程序有多个端口,需要多端口进行监控并配置Itmes,还有磁盘分区,·网卡名称等等, 都是具有不确定性,如果我们配置固定的Items的话,会出现无法通用的问题,所以呢,我们需要来了解一下low level …

Using a Router Instance Let's refactor app.js to use a Router object. Create a new router object and assign it to the router variable. var router = express.Router(); When we are done, our router will be mounted on the /cities path. With this in mind,…

Response Body What would the response body be set to on a DELETE request to /cities/DoesNotExist ? Here's the link to the sendStatus function source code if you need to take a look. Answer: 404 Delete Route Create a Dynamic Route for deleting cities…

Flexible Routes Our current route only works when the city name argument matches exactly the properties in the cities object. This is a problem. We need a way to make our code more flexible. Inside our route, call the parseCityName() function passing…

Logging Middleware Help finish the following middleware code in the logger.js file: On the response object, listen to the event that's emitted when the response has been handed off from Express to the underlying Operating System. response.on('finish'…