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In this section, we will learn how to create a simple Node.js web server and handle HTTP requests.
To access web pages of any web application, you need a web server. The web server will handle all the http requests for the web application e.g IIS is a web server for ASP.NET web applications and Apache is a web server for PHP or Java web applications.
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I wanted to know standard process to deploy nodejs app on production. As of now I am following the process as below Pull the source code git pull giturl Install npm dependencies npm install. I have a Node.js/Express.js app running on my server that only works on port 3000 and I'm trying to figure out why. Here's what I've found: Without specifying a port (app.listen), the app runs b.
Node.js provides capabilities to create your own web server which will handle HTTP requests asynchronously. You can use IIS or Apache to run Node.js web application but it is recommended to use Node.js web server.
Create Node.js Web Server
Node.js makes it easy to create a simple web server that processes incoming requests asynchronously.
The following example is a simple Node.js web server contained in server.js file.
In the above example, we import the http module using require() function. The http module is a core module of Node.js, so no need to install it using NPM. The next step is to call createServer() method of http and specify callback function with request and response parameter. Finally, call listen() method of server object which was returned from createServer() method with port number, to start listening to incoming requests on port 5000. You can specify any unused port here.
Run the above web server by writing node server.js command in command prompt or terminal window and it will display message as shown below.
Node.js web server at port 5000 is running..
This is how you create a Node.js web server using simple steps. Now, let's see how to handle HTTP request and send response in Node.js web server.
Handle HTTP Request
The http.createServer() method includes request and response parameters which is supplied by Node.js. The request object can be used to get information about the current HTTP request e.g., url, request header, and data. The response object can be used to send a response for a current HTTP request.
The following example demonstrates handling HTTP request and response in Node.js.
In the above example, req.url is used to check the url of the current request and based on that it sends the response. To send a response, first it sets the response header using writeHead() method and then writes a string as a response body using write() method. Finally, Node.js web server sends the response using end() method.
Now, run the above web server as shown below.
C:> node server.jsNode.js web server at port 5000 is running..
To test it, you can use the command-line program curl, which most Mac and Linux machines have pre-installed.
curl -i http://localhost:5000You should see the following response.
HTTP/1.1 200 OKContent-Type: text/plain
Date: Tue, 8 Sep 2015 03:05:08 GMT
Connection: keep-alive
This is home page.
For Windows users, point your browser to http://localhost:5000 and see the following result.
The same way, point your browser to http://localhost:5000/student and see the following result.
It will display 'Invalid Request' for all requests other than the above URLs.
Sending JSON Response
The following example demonstrates how to serve JSON response from the Node.js web server.
So, this way you can create a simple web server that serves different responses.
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Learn how to create Node.js Web Application in Visual Studio.