loopback-datasource-juggler/lib/adapters/neo4j-lib/node_modules/request

Request -- Simplified HTTP request method

Install

  npm install request

Or from source:

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

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.

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.

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.

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.

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

Now let's get fancy.

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:

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 :)

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.

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".

request.put(url)

request.post

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

request.post(url)

request.head

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

request.head(url)

request.del

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

request.del(url)

request.get

Alias to normal request method for uniformity.

request.get(url)

Examples:

  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)
      }
    }
  )