loopback-datasource-juggler/lib/adapters/neo4j-lib/node_modules/request/README.md

# Request -- Simplified HTTP request method

## Install

<pre>
  npm install request
</pre>

Or from source:

<pre>
  git clone git://github.com/mikeal/request.git 
  cd request
  npm link
</pre>

## Super simple to use

Request is designed to be the simplest way possible to make http calls. It support HTTPS and follows redirects by default.

```javascript
var request = require('request');
request('http://www.google.com', function (error, response, body) {
  if (!error && response.statusCode == 200) {
    sys.puts(body) // Print the google web page.
  }
})
```

## Streaming

You can stream any response to a file stream.

```javascript
request('http://google.com/doodle.png').pipe(fs.createWriteStream('doodle.png'))
```

You can also stream a file to a PUT or POST request. This method will also check the file extension against a mapping of file extensions to content-types, in this case `application/json`, and use the proper content-type in the PUT request if one is not already provided in the headers.

```javascript
fs.readStream('file.json').pipe(request.put('http://mysite.com/obj.json'))
```

Request can also pipe to itself. When doing so the content-type and content-length will be preserved in the PUT headers.

```javascript
request.get('http://google.com/img.png').pipe(request.put('http://mysite.com/img.png'))
```

Now let's get fancy.

```javascript
http.createServer(function (req, resp) {
  if (req.url === '/doodle.png') {
    if (req.method === 'PUT') {
      req.pipe(request.put('http://mysite.com/doodle.png'))
    } else if (req.method === 'GET' || req.method === 'HEAD') {
      request.get('http://mysite.com/doodle.png').pipe(resp)
    } 
  }
})
```

You can also pipe() from a http.ServerRequest instance and to a http.ServerResponse instance. The HTTP method and headers will be sent as well as the entity-body data. Which means that, if you don't really care about security, you can do:

```javascript
http.createServer(function (req, resp) {
  if (req.url === '/doodle.png') {
    var x = request('http://mysite.com/doodle.png')
    req.pipe(x)
    x.pipe(resp)
  }
})
```

And since pipe() returns the destination stream in node 0.5.x you can do one line proxying :)

```javascript
req.pipe(request('http://mysite.com/doodle.png')).pipe(resp)
```

Also, none of this new functionality conflicts with requests previous features, it just expands them.

```javascript
var r = request.defaults({'proxy':'http://localproxy.com'})

http.createServer(function (req, resp) {
  if (req.url === '/doodle.png') {
    r.get('http://google.com/doodle.png').pipe(resp)
  }
})
```

You can still use intermediate proxies, the requests will still follow HTTP forwards, etc.

### request(options, callback)

The first argument can be either a url or an options object. The only required option is uri, all others are optional.

* `uri` || `url` - fully qualified uri or a parsed url object from url.parse()
* `method` - http method, defaults to GET
* `headers` - http headers, defaults to {}
* `body` - entity body for POST and PUT requests. Must be buffer or string.
* `json` - sets `body` but to JSON representation of value and adds `Content-type: application/json` header.
* `multipart` - (experimental) array of objects which contains their own headers and `body` attribute. Sends `multipart/related` request. See example below.
* `followRedirect` - follow HTTP 3xx responses as redirects. defaults to true.
* `maxRedirects` - the maximum number of redirects to follow, defaults to 10.
* `onResponse` - If true the callback will be fired on the "response" event instead of "end". If a function it will be called on "response" and not effect the regular semantics of the main callback on "end".
* `encoding` - Encoding to be used on response.setEncoding when buffering the response data.
* `pool` - A hash object containing the agents for these requests. If omitted this request will use the global pool which is set to node's default maxSockets.
* `pool.maxSockets` - Integer containing the maximum amount of sockets in the pool.
* `timeout` - Integer containing the number of milliseconds to wait for a request to respond before aborting the request	
* `proxy` - An HTTP proxy to be used. Support proxy Auth with Basic Auth the same way it's supported with the `url` parameter by embedding the auth info in the uri.

The callback argument gets 3 arguments. The first is an error when applicable (usually from the http.Client option not the http.ClientRequest object). The second in an http.ClientResponse object. The third is the response body buffer.

## Convenience methods

There are also shorthand methods for different HTTP METHODs and some other conveniences.

### request.defaults(options)  
  
This method returns a wrapper around the normal request API that defaults to whatever options you pass in to it.

### request.put

Same as request() but defaults to `method: "PUT"`.

```javascript
request.put(url)
```

### request.post

Same as request() but defaults to `method: "POST"`.

```javascript
request.post(url)
```

### request.head

Same as request() but defaults to `method: "HEAD"`.

```javascript
request.head(url)
```

### request.del

Same as request() but defaults to `method: "DELETE"`.

```javascript
request.del(url)
```

### request.get

Alias to normal request method for uniformity.

```javascript
request.get(url)
```


## Examples:

```javascript
  var request = require('request')
    , rand = Math.floor(Math.random()*100000000).toString()
    ;
  request(
    { method: 'PUT'
    , uri: 'http://mikeal.couchone.com/testjs/' + rand
    , multipart: 
      [ { 'content-type': 'application/json'
        ,  body: JSON.stringify({foo: 'bar', _attachments: {'message.txt': {follows: true, length: 18, 'content_type': 'text/plain' }}})
        }
      , { body: 'I am an attachment' }
      ] 
    }
  , function (error, response, body) {
      if(response.statusCode == 201){
        console.log('document saved as: http://mikeal.couchone.com/testjs/'+ rand)
      } else {
        console.log('error: '+ response.statusCode)
        console.log(body)
      }
    }
  )
```