learnyounode/exercises/http_client/problem.md

Learn You The Node.js For Much Win! An intro to Node.js via a set of self-guided workshops.

Create a file named `http-client.js`.

Write a program that performs an HTTP GET request to a URL provided to you as the first command-line argument. Write the String contents of **each** "data" event from the response to a new line on the console (stdout).

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## HINTS

For this exercise you will need to use the `http` core module.

Documentation on the `http` module can be found by pointing your browser here:
  {rootdir:/docs-nodejs/http.html}

The `http.get()` method is a shortcut for simple GET requests, use it to simplify your solution. The first argument to `http.get()` can be the URL you want to GET; provide a callback as the second argument.

Unlike other callback functions, this one has the signature:

```js
function callback (response) { /* ... */ }
```

Where the `response` object is a Node **Stream** object. You can treat Node Streams as objects that emit events. The three events that are of most interest are: "data", "error" and "end". You listen to an event like so:

```js
response.on('data', function (data) { /* ... */ })
```

The "data" event is emitted when a chunk of data is available and can be processed. The size of the chunk depends upon the underlying data source.

The `response` object / Stream that you get from `http.get()` also has a `setEncoding()` method. If you call this method with "utf8", the "data" events will emit Strings rather than the standard Node `Buffer` objects which you have to explicitly convert to Strings.

Check to see if your program is correct by running this command:

```sh
$ {appname} verify http-client.js
```