HEADS UP! This article was written for an older version of node. More up-to-date information may be available elsewhere.

This was the first in a series of posts leading up toNode.js Knockout on how to use node.js.

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. If a program has restricted access to the Internet, such as Outgoing or Blocked permissions, you can change its permissions to allow full incoming and outgoing Internet access.

I have been given permission to repost the articles from the contest here (in wheat format) for general consumption. Expect more to come.

In this post we detail how to install node on Mac, Ubuntu,and Windows.

Mac

If you're using the excellent homebrew package manager, you caninstall node with one command: brew install node.

Otherwise, follow the below steps:

1. Install Xcode.
2. Install git.
3. Run the following commands:

You can check it worked with a simple Hello, World! example.

Debian (Ubuntu/ Mint)

With Aptitude package manager one can install the package nodeJS then edit their bash config to redirect the command node to nodejs.

nano (edit / vim) the file ~/.bashrc and add the line: alias node='nodejs'

Redhat (Fedora / CentOs)

Simply install from official repos:

If that fails, enable EPEL repo:

Then simply install from repo:

Gentoo

In portage tree:

Archlinux

In official repo use pacman package manager:

Linux from source

1. Install the dependencies ( Below example using debian apptitude package manager):g++ curllibssl-dev apache2-utilsgit-corebuild-essential

   • sudo apt-get install g++ curl libssl-dev apache2-utils git-core build-essential

2. Run the following commands:

You can check it worked with a simple Hello, World! example.

Thanks to code-diesel for the Ubuntu dependencies.

Windows

Currently, you must use cygwin to install node. To do so,follow these steps:

1. Install cygwin.

2. Use setup.exe in the cygwin folder to install the followingpackages:

   • devel → openssl
   • devel → g++-gcc
   • devel → make
   • python → python
   • devel → git

3. Open the cygwin command line withStart > Cygwin > Cygwin Bash Shell.

4. Run the below commands to download and build node.

For more details, including information on troubleshooting, pleasesee the GitHub wiki page.

Hello Node.js!

Here's a quick program to make sure everything is up and runningcorrectly:

Run the code with the node command line utility:

Now, if you navigate to http://127.0.0.1:8124/ in your browser,you should see a nice message.

Congrats!

You've installed node.js.

Nodejs Poker Server Games

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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.

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.

C:> node server.js
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.

Nodejs Poker Server Settings

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.js
Node.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:5000

You should see the following response.

Nodejs Poker Servers

HTTP/1.1 200 OK
Content-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.

Learn how to create Node.js Web Application in Visual Studio.