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diff --git a/node_modules/uncss/node_modules/request/request.js b/node_modules/uncss/node_modules/request/request.js
new file mode 100644
index 000000000..e4a181237
--- /dev/null
+++ b/node_modules/uncss/node_modules/request/request.js
@@ -0,0 +1,1419 @@
+'use strict'
+
+var http = require('http')
+  , https = require('https')
+  , url = require('url')
+  , util = require('util')
+  , stream = require('stream')
+  , zlib = require('zlib')
+  , bl = require('bl')
+  , hawk = require('hawk')
+  , aws2 = require('aws-sign2')
+  , httpSignature = require('http-signature')
+  , mime = require('mime-types')
+  , stringstream = require('stringstream')
+  , caseless = require('caseless')
+  , ForeverAgent = require('forever-agent')
+  , FormData = require('form-data')
+  , extend = require('extend')
+  , isTypedArray = require('is-typedarray').strict
+  , helpers = require('./lib/helpers')
+  , cookies = require('./lib/cookies')
+  , getProxyFromURI = require('./lib/getProxyFromURI')
+  , Querystring = require('./lib/querystring').Querystring
+  , Har = require('./lib/har').Har
+  , Auth = require('./lib/auth').Auth
+  , OAuth = require('./lib/oauth').OAuth
+  , Multipart = require('./lib/multipart').Multipart
+  , Redirect = require('./lib/redirect').Redirect
+  , Tunnel = require('./lib/tunnel').Tunnel
+
+var safeStringify = helpers.safeStringify
+  , isReadStream = helpers.isReadStream
+  , toBase64 = helpers.toBase64
+  , defer = helpers.defer
+  , copy = helpers.copy
+  , version = helpers.version
+  , globalCookieJar = cookies.jar()
+
+
+var globalPool = {}
+
+function filterForNonReserved(reserved, options) {
+  // Filter out properties that are not reserved.
+  // Reserved values are passed in at call site.
+
+  var object = {}
+  for (var i in options) {
+    var notReserved = (reserved.indexOf(i) === -1)
+    if (notReserved) {
+      object[i] = options[i]
+    }
+  }
+  return object
+}
+
+function filterOutReservedFunctions(reserved, options) {
+  // Filter out properties that are functions and are reserved.
+  // Reserved values are passed in at call site.
+
+  var object = {}
+  for (var i in options) {
+    var isReserved = !(reserved.indexOf(i) === -1)
+    var isFunction = (typeof options[i] === 'function')
+    if (!(isReserved && isFunction)) {
+      object[i] = options[i]
+    }
+  }
+  return object
+
+}
+
+// Function for properly handling a connection error
+function connectionErrorHandler(error) {
+  var socket = this
+  if (socket.res) {
+    if (socket.res.request) {
+      socket.res.request.emit('error', error)
+    } else {
+      socket.res.emit('error', error)
+    }
+  } else {
+    socket._httpMessage.emit('error', error)
+  }
+}
+
+// Return a simpler request object to allow serialization
+function requestToJSON() {
+  var self = this
+  return {
+    uri: self.uri,
+    method: self.method,
+    headers: self.headers
+  }
+}
+
+// Return a simpler response object to allow serialization
+function responseToJSON() {
+  var self = this
+  return {
+    statusCode: self.statusCode,
+    body: self.body,
+    headers: self.headers,
+    request: requestToJSON.call(self.request)
+  }
+}
+
+function Request (options) {
+  // if given the method property in options, set property explicitMethod to true
+
+  // extend the Request instance with any non-reserved properties
+  // remove any reserved functions from the options object
+  // set Request instance to be readable and writable
+  // call init
+
+  var self = this
+
+  // start with HAR, then override with additional options
+  if (options.har) {
+    self._har = new Har(self)
+    options = self._har.options(options)
+  }
+
+  stream.Stream.call(self)
+  var reserved = Object.keys(Request.prototype)
+  var nonReserved = filterForNonReserved(reserved, options)
+
+  extend(self, nonReserved)
+  options = filterOutReservedFunctions(reserved, options)
+
+  self.readable = true
+  self.writable = true
+  if (options.method) {
+    self.explicitMethod = true
+  }
+  self._qs = new Querystring(self)
+  self._auth = new Auth(self)
+  self._oauth = new OAuth(self)
+  self._multipart = new Multipart(self)
+  self._redirect = new Redirect(self)
+  self._tunnel = new Tunnel(self)
+  self.init(options)
+}
+
+util.inherits(Request, stream.Stream)
+
+// Debugging
+Request.debug = process.env.NODE_DEBUG && /\brequest\b/.test(process.env.NODE_DEBUG)
+function debug() {
+  if (Request.debug) {
+    console.error('REQUEST %s', util.format.apply(util, arguments))
+  }
+}
+Request.prototype.debug = debug
+
+Request.prototype.init = function (options) {
+  // init() contains all the code to setup the request object.
+  // the actual outgoing request is not started until start() is called
+  // this function is called from both the constructor and on redirect.
+  var self = this
+  if (!options) {
+    options = {}
+  }
+  self.headers = self.headers ? copy(self.headers) : {}
+
+  // Delete headers with value undefined since they break
+  // ClientRequest.OutgoingMessage.setHeader in node 0.12
+  for (var headerName in self.headers) {
+    if (typeof self.headers[headerName] === 'undefined') {
+      delete self.headers[headerName]
+    }
+  }
+
+  caseless.httpify(self, self.headers)
+
+  if (!self.method) {
+    self.method = options.method || 'GET'
+  }
+  if (!self.localAddress) {
+    self.localAddress = options.localAddress
+  }
+
+  self._qs.init(options)
+
+  debug(options)
+  if (!self.pool && self.pool !== false) {
+    self.pool = globalPool
+  }
+  self.dests = self.dests || []
+  self.__isRequestRequest = true
+
+  // Protect against double callback
+  if (!self._callback && self.callback) {
+    self._callback = self.callback
+    self.callback = function () {
+      if (self._callbackCalled) {
+        return // Print a warning maybe?
+      }
+      self._callbackCalled = true
+      self._callback.apply(self, arguments)
+    }
+    self.on('error', self.callback.bind())
+    self.on('complete', self.callback.bind(self, null))
+  }
+
+  // People use this property instead all the time, so support it
+  if (!self.uri && self.url) {
+    self.uri = self.url
+    delete self.url
+  }
+
+  // If there's a baseUrl, then use it as the base URL (i.e. uri must be
+  // specified as a relative path and is appended to baseUrl).
+  if (self.baseUrl) {
+    if (typeof self.baseUrl !== 'string') {
+      return self.emit('error', new Error('options.baseUrl must be a string'))
+    }
+
+    if (typeof self.uri !== 'string') {
+      return self.emit('error', new Error('options.uri must be a string when using options.baseUrl'))
+    }
+
+    if (self.uri.indexOf('//') === 0 || self.uri.indexOf('://') !== -1) {
+      return self.emit('error', new Error('options.uri must be a path when using options.baseUrl'))
+    }
+
+    // Handle all cases to make sure that there's only one slash between
+    // baseUrl and uri.
+    var baseUrlEndsWithSlash = self.baseUrl.lastIndexOf('/') === self.baseUrl.length - 1
+    var uriStartsWithSlash = self.uri.indexOf('/') === 0
+
+    if (baseUrlEndsWithSlash && uriStartsWithSlash) {
+      self.uri = self.baseUrl + self.uri.slice(1)
+    } else if (baseUrlEndsWithSlash || uriStartsWithSlash) {
+      self.uri = self.baseUrl + self.uri
+    } else if (self.uri === '') {
+      self.uri = self.baseUrl
+    } else {
+      self.uri = self.baseUrl + '/' + self.uri
+    }
+    delete self.baseUrl
+  }
+
+  // A URI is needed by this point, emit error if we haven't been able to get one
+  if (!self.uri) {
+    return self.emit('error', new Error('options.uri is a required argument'))
+  }
+
+  // If a string URI/URL was given, parse it into a URL object
+  if (typeof self.uri === 'string') {
+    self.uri = url.parse(self.uri)
+  }
+
+  // Some URL objects are not from a URL parsed string and need href added
+  if (!self.uri.href) {
+    self.uri.href = url.format(self.uri)
+  }
+
+  // DEPRECATED: Warning for users of the old Unix Sockets URL Scheme
+  if (self.uri.protocol === 'unix:') {
+    return self.emit('error', new Error('`unix://` URL scheme is no longer supported. Please use the format `http://unix:SOCKET:PATH`'))
+  }
+
+  // Support Unix Sockets
+  if (self.uri.host === 'unix') {
+    self.enableUnixSocket()
+  }
+
+  if (self.strictSSL === false) {
+    self.rejectUnauthorized = false
+  }
+
+  if (!self.uri.pathname) {self.uri.pathname = '/'}
+
+  if (!(self.uri.host || (self.uri.hostname && self.uri.port)) && !self.uri.isUnix) {
+    // Invalid URI: it may generate lot of bad errors, like 'TypeError: Cannot call method `indexOf` of undefined' in CookieJar
+    // Detect and reject it as soon as possible
+    var faultyUri = url.format(self.uri)
+    var message = 'Invalid URI "' + faultyUri + '"'
+    if (Object.keys(options).length === 0) {
+      // No option ? This can be the sign of a redirect
+      // As this is a case where the user cannot do anything (they didn't call request directly with this URL)
+      // they should be warned that it can be caused by a redirection (can save some hair)
+      message += '. This can be caused by a crappy redirection.'
+    }
+    // This error was fatal
+    self.abort()
+    return self.emit('error', new Error(message))
+  }
+
+  if (!self.hasOwnProperty('proxy')) {
+    self.proxy = getProxyFromURI(self.uri)
+  }
+
+  self.tunnel = self._tunnel.isEnabled()
+  if (self.proxy) {
+    self._tunnel.setup(options)
+  }
+
+  self._redirect.onRequest(options)
+
+  self.setHost = false
+  if (!self.hasHeader('host')) {
+    var hostHeaderName = self.originalHostHeaderName || 'host'
+    self.setHeader(hostHeaderName, self.uri.hostname)
+    if (self.uri.port) {
+      if ( !(self.uri.port === 80 && self.uri.protocol === 'http:') &&
+           !(self.uri.port === 443 && self.uri.protocol === 'https:') ) {
+        self.setHeader(hostHeaderName, self.getHeader('host') + (':' + self.uri.port) )
+      }
+    }
+    self.setHost = true
+  }
+
+  self.jar(self._jar || options.jar)
+
+  if (!self.uri.port) {
+    if (self.uri.protocol === 'http:') {self.uri.port = 80}
+    else if (self.uri.protocol === 'https:') {self.uri.port = 443}
+  }
+
+  if (self.proxy && !self.tunnel) {
+    self.port = self.proxy.port
+    self.host = self.proxy.hostname
+  } else {
+    self.port = self.uri.port
+    self.host = self.uri.hostname
+  }
+
+  if (options.form) {
+    self.form(options.form)
+  }
+
+  if (options.formData) {
+    var formData = options.formData
+    var requestForm = self.form()
+    var appendFormValue = function (key, value) {
+      if (value.hasOwnProperty('value') && value.hasOwnProperty('options')) {
+        requestForm.append(key, value.value, value.options)
+      } else {
+        requestForm.append(key, value)
+      }
+    }
+    for (var formKey in formData) {
+      if (formData.hasOwnProperty(formKey)) {
+        var formValue = formData[formKey]
+        if (formValue instanceof Array) {
+          for (var j = 0; j < formValue.length; j++) {
+            appendFormValue(formKey, formValue[j])
+          }
+        } else {
+          appendFormValue(formKey, formValue)
+        }
+      }
+    }
+  }
+
+  if (options.qs) {
+    self.qs(options.qs)
+  }
+
+  if (self.uri.path) {
+    self.path = self.uri.path
+  } else {
+    self.path = self.uri.pathname + (self.uri.search || '')
+  }
+
+  if (self.path.length === 0) {
+    self.path = '/'
+  }
+
+  // Auth must happen last in case signing is dependent on other headers
+  if (options.aws) {
+    self.aws(options.aws)
+  }
+
+  if (options.hawk) {
+    self.hawk(options.hawk)
+  }
+
+  if (options.httpSignature) {
+    self.httpSignature(options.httpSignature)
+  }
+
+  if (options.auth) {
+    if (Object.prototype.hasOwnProperty.call(options.auth, 'username')) {
+      options.auth.user = options.auth.username
+    }
+    if (Object.prototype.hasOwnProperty.call(options.auth, 'password')) {
+      options.auth.pass = options.auth.password
+    }
+
+    self.auth(
+      options.auth.user,
+      options.auth.pass,
+      options.auth.sendImmediately,
+      options.auth.bearer
+    )
+  }
+
+  if (self.gzip && !self.hasHeader('accept-encoding')) {
+    self.setHeader('accept-encoding', 'gzip')
+  }
+
+  if (self.uri.auth && !self.hasHeader('authorization')) {
+    var uriAuthPieces = self.uri.auth.split(':').map(function(item) {return self._qs.unescape(item)})
+    self.auth(uriAuthPieces[0], uriAuthPieces.slice(1).join(':'), true)
+  }
+
+  if (!self.tunnel && self.proxy && self.proxy.auth && !self.hasHeader('proxy-authorization')) {
+    var proxyAuthPieces = self.proxy.auth.split(':').map(function(item) {return self._qs.unescape(item)})
+    var authHeader = 'Basic ' + toBase64(proxyAuthPieces.join(':'))
+    self.setHeader('proxy-authorization', authHeader)
+  }
+
+  if (self.proxy && !self.tunnel) {
+    self.path = (self.uri.protocol + '//' + self.uri.host + self.path)
+  }
+
+  if (options.json) {
+    self.json(options.json)
+  }
+  if (options.multipart) {
+    self.multipart(options.multipart)
+  }
+
+  if (options.time) {
+    self.timing = true
+    self.elapsedTime = self.elapsedTime || 0
+  }
+
+  function setContentLength () {
+    if (isTypedArray(self.body)) {
+      self.body = new Buffer(self.body)
+    }
+
+    if (!self.hasHeader('content-length')) {
+      var length
+      if (typeof self.body === 'string') {
+        length = Buffer.byteLength(self.body)
+      }
+      else if (Array.isArray(self.body)) {
+        length = self.body.reduce(function (a, b) {return a + b.length}, 0)
+      }
+      else {
+        length = self.body.length
+      }
+
+      if (length) {
+        self.setHeader('content-length', length)
+      } else {
+        self.emit('error', new Error('Argument error, options.body.'))
+      }
+    }
+  }
+  if (self.body) {
+    setContentLength()
+  }
+
+  if (options.oauth) {
+    self.oauth(options.oauth)
+  } else if (self._oauth.params && self.hasHeader('authorization')) {
+    self.oauth(self._oauth.params)
+  }
+
+  var protocol = self.proxy && !self.tunnel ? self.proxy.protocol : self.uri.protocol
+    , defaultModules = {'http:':http, 'https:':https}
+    , httpModules = self.httpModules || {}
+
+  self.httpModule = httpModules[protocol] || defaultModules[protocol]
+
+  if (!self.httpModule) {
+    return self.emit('error', new Error('Invalid protocol: ' + protocol))
+  }
+
+  if (options.ca) {
+    self.ca = options.ca
+  }
+
+  if (!self.agent) {
+    if (options.agentOptions) {
+      self.agentOptions = options.agentOptions
+    }
+
+    if (options.agentClass) {
+      self.agentClass = options.agentClass
+    } else if (options.forever) {
+      var v = version()
+      // use ForeverAgent in node 0.10- only
+      if (v.major === 0 && v.minor <= 10) {
+        self.agentClass = protocol === 'http:' ? ForeverAgent : ForeverAgent.SSL
+      } else {
+        self.agentClass = self.httpModule.Agent
+        self.agentOptions = self.agentOptions || {}
+        self.agentOptions.keepAlive = true
+      }
+    } else {
+      self.agentClass = self.httpModule.Agent
+    }
+  }
+
+  if (self.pool === false) {
+    self.agent = false
+  } else {
+    self.agent = self.agent || self.getNewAgent()
+  }
+
+  self.on('pipe', function (src) {
+    if (self.ntick && self._started) {
+      self.emit('error', new Error('You cannot pipe to this stream after the outbound request has started.'))
+    }
+    self.src = src
+    if (isReadStream(src)) {
+      if (!self.hasHeader('content-type')) {
+        self.setHeader('content-type', mime.lookup(src.path))
+      }
+    } else {
+      if (src.headers) {
+        for (var i in src.headers) {
+          if (!self.hasHeader(i)) {
+            self.setHeader(i, src.headers[i])
+          }
+        }
+      }
+      if (self._json && !self.hasHeader('content-type')) {
+        self.setHeader('content-type', 'application/json')
+      }
+      if (src.method && !self.explicitMethod) {
+        self.method = src.method
+      }
+    }
+
+    // self.on('pipe', function () {
+    //   console.error('You have already piped to this stream. Pipeing twice is likely to break the request.')
+    // })
+  })
+
+  defer(function () {
+    if (self._aborted) {
+      return
+    }
+
+    var end = function () {
+      if (self._form) {
+        if (!self._auth.hasAuth) {
+          self._form.pipe(self)
+        }
+        else if (self._auth.hasAuth && self._auth.sentAuth) {
+          self._form.pipe(self)
+        }
+      }
+      if (self._multipart && self._multipart.chunked) {
+        self._multipart.body.pipe(self)
+      }
+      if (self.body) {
+        setContentLength()
+        if (Array.isArray(self.body)) {
+          self.body.forEach(function (part) {
+            self.write(part)
+          })
+        } else {
+          self.write(self.body)
+        }
+        self.end()
+      } else if (self.requestBodyStream) {
+        console.warn('options.requestBodyStream is deprecated, please pass the request object to stream.pipe.')
+        self.requestBodyStream.pipe(self)
+      } else if (!self.src) {
+        if (self._auth.hasAuth && !self._auth.sentAuth) {
+          self.end()
+          return
+        }
+        if (self.method !== 'GET' && typeof self.method !== 'undefined') {
+          self.setHeader('content-length', 0)
+        }
+        self.end()
+      }
+    }
+
+    if (self._form && !self.hasHeader('content-length')) {
+      // Before ending the request, we had to compute the length of the whole form, asyncly
+      self.setHeader(self._form.getHeaders(), true)
+      self._form.getLength(function (err, length) {
+        if (!err && !isNaN(length)) {
+          self.setHeader('content-length', length)
+        }
+        end()
+      })
+    } else {
+      end()
+    }
+
+    self.ntick = true
+  })
+
+}
+
+Request.prototype.getNewAgent = function () {
+  var self = this
+  var Agent = self.agentClass
+  var options = {}
+  if (self.agentOptions) {
+    for (var i in self.agentOptions) {
+      options[i] = self.agentOptions[i]
+    }
+  }
+  if (self.ca) {
+    options.ca = self.ca
+  }
+  if (self.ciphers) {
+    options.ciphers = self.ciphers
+  }
+  if (self.secureProtocol) {
+    options.secureProtocol = self.secureProtocol
+  }
+  if (self.secureOptions) {
+    options.secureOptions = self.secureOptions
+  }
+  if (typeof self.rejectUnauthorized !== 'undefined') {
+    options.rejectUnauthorized = self.rejectUnauthorized
+  }
+
+  if (self.cert && self.key) {
+    options.key = self.key
+    options.cert = self.cert
+  }
+
+  if (self.pfx) {
+    options.pfx = self.pfx
+  }
+
+  if (self.passphrase) {
+    options.passphrase = self.passphrase
+  }
+
+  var poolKey = ''
+
+  // different types of agents are in different pools
+  if (Agent !== self.httpModule.Agent) {
+    poolKey += Agent.name
+  }
+
+  // ca option is only relevant if proxy or destination are https
+  var proxy = self.proxy
+  if (typeof proxy === 'string') {
+    proxy = url.parse(proxy)
+  }
+  var isHttps = (proxy && proxy.protocol === 'https:') || this.uri.protocol === 'https:'
+
+  if (isHttps) {
+    if (options.ca) {
+      if (poolKey) {
+        poolKey += ':'
+      }
+      poolKey += options.ca
+    }
+
+    if (typeof options.rejectUnauthorized !== 'undefined') {
+      if (poolKey) {
+        poolKey += ':'
+      }
+      poolKey += options.rejectUnauthorized
+    }
+
+    if (options.cert) {
+      if (poolKey) {
+        poolKey += ':'
+      }
+      poolKey += options.cert.toString('ascii') + options.key.toString('ascii')
+    }
+
+    if (options.pfx) {
+      if (poolKey) {
+        poolKey += ':'
+      }
+      poolKey += options.pfx.toString('ascii')
+    }
+
+    if (options.ciphers) {
+      if (poolKey) {
+        poolKey += ':'
+      }
+      poolKey += options.ciphers
+    }
+
+    if (options.secureProtocol) {
+      if (poolKey) {
+        poolKey += ':'
+      }
+      poolKey += options.secureProtocol
+    }
+
+    if (options.secureOptions) {
+      if (poolKey) {
+        poolKey += ':'
+      }
+      poolKey += options.secureOptions
+    }
+  }
+
+  if (self.pool === globalPool && !poolKey && Object.keys(options).length === 0 && self.httpModule.globalAgent) {
+    // not doing anything special.  Use the globalAgent
+    return self.httpModule.globalAgent
+  }
+
+  // we're using a stored agent.  Make sure it's protocol-specific
+  poolKey = self.uri.protocol + poolKey
+
+  // generate a new agent for this setting if none yet exists
+  if (!self.pool[poolKey]) {
+    self.pool[poolKey] = new Agent(options)
+    // properly set maxSockets on new agents
+    if (self.pool.maxSockets) {
+      self.pool[poolKey].maxSockets = self.pool.maxSockets
+    }
+  }
+
+  return self.pool[poolKey]
+}
+
+Request.prototype.start = function () {
+  // start() is called once we are ready to send the outgoing HTTP request.
+  // this is usually called on the first write(), end() or on nextTick()
+  var self = this
+
+  if (self._aborted) {
+    return
+  }
+
+  self._started = true
+  self.method = self.method || 'GET'
+  self.href = self.uri.href
+
+  if (self.src && self.src.stat && self.src.stat.size && !self.hasHeader('content-length')) {
+    self.setHeader('content-length', self.src.stat.size)
+  }
+  if (self._aws) {
+    self.aws(self._aws, true)
+  }
+
+  // We have a method named auth, which is completely different from the http.request
+  // auth option.  If we don't remove it, we're gonna have a bad time.
+  var reqOptions = copy(self)
+  delete reqOptions.auth
+
+  debug('make request', self.uri.href)
+
+  self.req = self.httpModule.request(reqOptions)
+
+  if (self.timing) {
+    self.startTime = new Date().getTime()
+  }
+
+  if (self.timeout && !self.timeoutTimer) {
+    var timeout = self.timeout < 0 ? 0 : self.timeout
+    // Set a timeout in memory - this block will throw if the server takes more
+    // than `timeout` to write the HTTP status and headers (corresponding to
+    // the on('response') event on the client). NB: this measures wall-clock
+    // time, not the time between bytes sent by the server.
+    self.timeoutTimer = setTimeout(function () {
+      var connectTimeout = self.req.socket && self.req.socket.readable === false
+      self.abort()
+      var e = new Error('ETIMEDOUT')
+      e.code = 'ETIMEDOUT'
+      e.connect = connectTimeout
+      self.emit('error', e)
+    }, timeout)
+
+    if (self.req.setTimeout) { // only works on node 0.6+
+      // Set an additional timeout on the socket, via the `setsockopt` syscall.
+      // This timeout sets the amount of time to wait *between* bytes sent
+      // from the server, and may or may not correspond to the wall-clock time
+      // elapsed from the start of the request.
+      //
+      // In particular, it's useful for erroring if the server fails to send
+      // data halfway through streaming a response.
+      self.req.setTimeout(timeout, function () {
+        if (self.req) {
+          self.req.abort()
+          var e = new Error('ESOCKETTIMEDOUT')
+          e.code = 'ESOCKETTIMEDOUT'
+          e.connect = false
+          self.emit('error', e)
+        }
+      })
+    }
+  }
+
+  self.req.on('response', self.onRequestResponse.bind(self))
+  self.req.on('error', self.onRequestError.bind(self))
+  self.req.on('drain', function() {
+    self.emit('drain')
+  })
+  self.req.on('socket', function(socket) {
+    self.emit('socket', socket)
+  })
+
+  self.on('end', function() {
+    if ( self.req.connection ) {
+      self.req.connection.removeListener('error', connectionErrorHandler)
+    }
+  })
+  self.emit('request', self.req)
+}
+
+Request.prototype.onRequestError = function (error) {
+  var self = this
+  if (self._aborted) {
+    return
+  }
+  if (self.req && self.req._reusedSocket && error.code === 'ECONNRESET'
+      && self.agent.addRequestNoreuse) {
+    self.agent = { addRequest: self.agent.addRequestNoreuse.bind(self.agent) }
+    self.start()
+    self.req.end()
+    return
+  }
+  if (self.timeout && self.timeoutTimer) {
+    clearTimeout(self.timeoutTimer)
+    self.timeoutTimer = null
+  }
+  self.emit('error', error)
+}
+
+Request.prototype.onRequestResponse = function (response) {
+  var self = this
+  debug('onRequestResponse', self.uri.href, response.statusCode, response.headers)
+  response.on('end', function() {
+    if (self.timing) {
+      self.elapsedTime += (new Date().getTime() - self.startTime)
+      debug('elapsed time', self.elapsedTime)
+      response.elapsedTime = self.elapsedTime
+    }
+    debug('response end', self.uri.href, response.statusCode, response.headers)
+  })
+
+  // The check on response.connection is a workaround for browserify.
+  if (response.connection && response.connection.listeners('error').indexOf(connectionErrorHandler) === -1) {
+    response.connection.setMaxListeners(0)
+    response.connection.once('error', connectionErrorHandler)
+  }
+  if (self._aborted) {
+    debug('aborted', self.uri.href)
+    response.resume()
+    return
+  }
+
+  self.response = response
+  response.request = self
+  response.toJSON = responseToJSON
+
+  // XXX This is different on 0.10, because SSL is strict by default
+  if (self.httpModule === https &&
+      self.strictSSL && (!response.hasOwnProperty('socket') ||
+      !response.socket.authorized)) {
+    debug('strict ssl error', self.uri.href)
+    var sslErr = response.hasOwnProperty('socket') ? response.socket.authorizationError : self.uri.href + ' does not support SSL'
+    self.emit('error', new Error('SSL Error: ' + sslErr))
+    return
+  }
+
+  // Save the original host before any redirect (if it changes, we need to
+  // remove any authorization headers).  Also remember the case of the header
+  // name because lots of broken servers expect Host instead of host and we
+  // want the caller to be able to specify this.
+  self.originalHost = self.getHeader('host')
+  if (!self.originalHostHeaderName) {
+    self.originalHostHeaderName = self.hasHeader('host')
+  }
+  if (self.setHost) {
+    self.removeHeader('host')
+  }
+  if (self.timeout && self.timeoutTimer) {
+    clearTimeout(self.timeoutTimer)
+    self.timeoutTimer = null
+  }
+
+  var targetCookieJar = (self._jar && self._jar.setCookie) ? self._jar : globalCookieJar
+  var addCookie = function (cookie) {
+    //set the cookie if it's domain in the href's domain.
+    try {
+      targetCookieJar.setCookie(cookie, self.uri.href, {ignoreError: true})
+    } catch (e) {
+      self.emit('error', e)
+    }
+  }
+
+  response.caseless = caseless(response.headers)
+
+  if (response.caseless.has('set-cookie') && (!self._disableCookies)) {
+    var headerName = response.caseless.has('set-cookie')
+    if (Array.isArray(response.headers[headerName])) {
+      response.headers[headerName].forEach(addCookie)
+    } else {
+      addCookie(response.headers[headerName])
+    }
+  }
+
+  if (self._redirect.onResponse(response)) {
+    return // Ignore the rest of the response
+  } else {
+    // Be a good stream and emit end when the response is finished.
+    // Hack to emit end on close because of a core bug that never fires end
+    response.on('close', function () {
+      if (!self._ended) {
+        self.response.emit('end')
+      }
+    })
+
+    response.on('end', function () {
+      self._ended = true
+    })
+
+    var responseContent
+    if (self.gzip) {
+      var contentEncoding = response.headers['content-encoding'] || 'identity'
+      contentEncoding = contentEncoding.trim().toLowerCase()
+
+      if (contentEncoding === 'gzip') {
+        responseContent = zlib.createGunzip()
+        response.pipe(responseContent)
+      } else {
+        // Since previous versions didn't check for Content-Encoding header,
+        // ignore any invalid values to preserve backwards-compatibility
+        if (contentEncoding !== 'identity') {
+          debug('ignoring unrecognized Content-Encoding ' + contentEncoding)
+        }
+        responseContent = response
+      }
+    } else {
+      responseContent = response
+    }
+
+    if (self.encoding) {
+      if (self.dests.length !== 0) {
+        console.error('Ignoring encoding parameter as this stream is being piped to another stream which makes the encoding option invalid.')
+      } else if (responseContent.setEncoding) {
+        responseContent.setEncoding(self.encoding)
+      } else {
+        // Should only occur on node pre-v0.9.4 (joyent/node@9b5abe5) with
+        // zlib streams.
+        // If/When support for 0.9.4 is dropped, this should be unnecessary.
+        responseContent = responseContent.pipe(stringstream(self.encoding))
+      }
+    }
+
+    if (self._paused) {
+      responseContent.pause()
+    }
+
+    self.responseContent = responseContent
+
+    self.emit('response', response)
+
+    self.dests.forEach(function (dest) {
+      self.pipeDest(dest)
+    })
+
+    responseContent.on('data', function (chunk) {
+      self._destdata = true
+      self.emit('data', chunk)
+    })
+    responseContent.on('end', function (chunk) {
+      self.emit('end', chunk)
+    })
+    responseContent.on('error', function (error) {
+      self.emit('error', error)
+    })
+    responseContent.on('close', function () {self.emit('close')})
+
+    if (self.callback) {
+      self.readResponseBody(response)
+    }
+    //if no callback
+    else {
+      self.on('end', function () {
+        if (self._aborted) {
+          debug('aborted', self.uri.href)
+          return
+        }
+        self.emit('complete', response)
+      })
+    }
+  }
+  debug('finish init function', self.uri.href)
+}
+
+Request.prototype.readResponseBody = function (response) {
+  var self = this
+  debug('reading response\'s body')
+  var buffer = bl()
+    , strings = []
+
+  self.on('data', function (chunk) {
+    if (Buffer.isBuffer(chunk)) {
+      buffer.append(chunk)
+    } else {
+      strings.push(chunk)
+    }
+  })
+  self.on('end', function () {
+    debug('end event', self.uri.href)
+    if (self._aborted) {
+      debug('aborted', self.uri.href)
+      return
+    }
+
+    if (buffer.length) {
+      debug('has body', self.uri.href, buffer.length)
+      if (self.encoding === null) {
+        // response.body = buffer
+        // can't move to this until https://github.com/rvagg/bl/issues/13
+        response.body = buffer.slice()
+      } else {
+        response.body = buffer.toString(self.encoding)
+      }
+    } else if (strings.length) {
+      // The UTF8 BOM [0xEF,0xBB,0xBF] is converted to [0xFE,0xFF] in the JS UTC16/UCS2 representation.
+      // Strip this value out when the encoding is set to 'utf8', as upstream consumers won't expect it and it breaks JSON.parse().
+      if (self.encoding === 'utf8' && strings[0].length > 0 && strings[0][0] === '\uFEFF') {
+        strings[0] = strings[0].substring(1)
+      }
+      response.body = strings.join('')
+    }
+
+    if (self._json) {
+      try {
+        response.body = JSON.parse(response.body, self._jsonReviver)
+      } catch (e) {
+        debug('invalid JSON received', self.uri.href)
+      }
+    }
+    debug('emitting complete', self.uri.href)
+    if (typeof response.body === 'undefined' && !self._json) {
+      response.body = self.encoding === null ? new Buffer(0) : ''
+    }
+    self.emit('complete', response, response.body)
+  })
+}
+
+Request.prototype.abort = function () {
+  var self = this
+  self._aborted = true
+
+  if (self.req) {
+    self.req.abort()
+  }
+  else if (self.response) {
+    self.response.destroy()
+  }
+
+  self.emit('abort')
+}
+
+Request.prototype.pipeDest = function (dest) {
+  var self = this
+  var response = self.response
+  // Called after the response is received
+  if (dest.headers && !dest.headersSent) {
+    if (response.caseless.has('content-type')) {
+      var ctname = response.caseless.has('content-type')
+      if (dest.setHeader) {
+        dest.setHeader(ctname, response.headers[ctname])
+      }
+      else {
+        dest.headers[ctname] = response.headers[ctname]
+      }
+    }
+
+    if (response.caseless.has('content-length')) {
+      var clname = response.caseless.has('content-length')
+      if (dest.setHeader) {
+        dest.setHeader(clname, response.headers[clname])
+      } else {
+        dest.headers[clname] = response.headers[clname]
+      }
+    }
+  }
+  if (dest.setHeader && !dest.headersSent) {
+    for (var i in response.headers) {
+      // If the response content is being decoded, the Content-Encoding header
+      // of the response doesn't represent the piped content, so don't pass it.
+      if (!self.gzip || i !== 'content-encoding') {
+        dest.setHeader(i, response.headers[i])
+      }
+    }
+    dest.statusCode = response.statusCode
+  }
+  if (self.pipefilter) {
+    self.pipefilter(response, dest)
+  }
+}
+
+Request.prototype.qs = function (q, clobber) {
+  var self = this
+  var base
+  if (!clobber && self.uri.query) {
+    base = self._qs.parse(self.uri.query)
+  } else {
+    base = {}
+  }
+
+  for (var i in q) {
+    base[i] = q[i]
+  }
+
+  var qs = self._qs.stringify(base)
+
+  if (qs === '') {
+    return self
+  }
+
+  self.uri = url.parse(self.uri.href.split('?')[0] + '?' + qs)
+  self.url = self.uri
+  self.path = self.uri.path
+
+  if (self.uri.host === 'unix') {
+    self.enableUnixSocket()
+  }
+
+  return self
+}
+Request.prototype.form = function (form) {
+  var self = this
+  if (form) {
+    if (!/^application\/x-www-form-urlencoded\b/.test(self.getHeader('content-type'))) {
+      self.setHeader('content-type', 'application/x-www-form-urlencoded')
+    }
+    self.body = (typeof form === 'string')
+      ? self._qs.rfc3986(form.toString('utf8'))
+      : self._qs.stringify(form).toString('utf8')
+    return self
+  }
+  // create form-data object
+  self._form = new FormData()
+  self._form.on('error', function(err) {
+    err.message = 'form-data: ' + err.message
+    self.emit('error', err)
+    self.abort()
+  })
+  return self._form
+}
+Request.prototype.multipart = function (multipart) {
+  var self = this
+
+  self._multipart.onRequest(multipart)
+
+  if (!self._multipart.chunked) {
+    self.body = self._multipart.body
+  }
+
+  return self
+}
+Request.prototype.json = function (val) {
+  var self = this
+
+  if (!self.hasHeader('accept')) {
+    self.setHeader('accept', 'application/json')
+  }
+
+  self._json = true
+  if (typeof val === 'boolean') {
+    if (self.body !== undefined) {
+      if (!/^application\/x-www-form-urlencoded\b/.test(self.getHeader('content-type'))) {
+        self.body = safeStringify(self.body)
+      } else {
+        self.body = self._qs.rfc3986(self.body)
+      }
+      if (!self.hasHeader('content-type')) {
+        self.setHeader('content-type', 'application/json')
+      }
+    }
+  } else {
+    self.body = safeStringify(val)
+    if (!self.hasHeader('content-type')) {
+      self.setHeader('content-type', 'application/json')
+    }
+  }
+
+  if (typeof self.jsonReviver === 'function') {
+    self._jsonReviver = self.jsonReviver
+  }
+
+  return self
+}
+Request.prototype.getHeader = function (name, headers) {
+  var self = this
+  var result, re, match
+  if (!headers) {
+    headers = self.headers
+  }
+  Object.keys(headers).forEach(function (key) {
+    if (key.length !== name.length) {
+      return
+    }
+    re = new RegExp(name, 'i')
+    match = key.match(re)
+    if (match) {
+      result = headers[key]
+    }
+  })
+  return result
+}
+Request.prototype.enableUnixSocket = function () {
+  // Get the socket & request paths from the URL
+  var unixParts = this.uri.path.split(':')
+    , host = unixParts[0]
+    , path = unixParts[1]
+  // Apply unix properties to request
+  this.socketPath = host
+  this.uri.pathname = path
+  this.uri.path = path
+  this.uri.host = host
+  this.uri.hostname = host
+  this.uri.isUnix = true
+}
+
+
+Request.prototype.auth = function (user, pass, sendImmediately, bearer) {
+  var self = this
+
+  self._auth.onRequest(user, pass, sendImmediately, bearer)
+
+  return self
+}
+Request.prototype.aws = function (opts, now) {
+  var self = this
+
+  if (!now) {
+    self._aws = opts
+    return self
+  }
+  
+  if (opts.sign_version == 4 || opts.sign_version == '4') {
+    var aws4 = require('aws4')
+    // use aws4  
+    var options = {
+      host: self.uri.host,
+      path: self.uri.path,
+      method: self.method,
+      headers: {
+        'content-type': self.getHeader('content-type') || ''
+      },
+      body: self.body
+    }
+    var signRes = aws4.sign(options, {
+      accessKeyId: opts.key,
+      secretAccessKey: opts.secret
+    })
+    self.setHeader('authorization', signRes.headers.Authorization)
+    self.setHeader('x-amz-date', signRes.headers['X-Amz-Date'])
+  }
+  else {
+    // default: use aws-sign2
+    var date = new Date()
+    self.setHeader('date', date.toUTCString())
+    var auth =
+      { key: opts.key
+      , secret: opts.secret
+      , verb: self.method.toUpperCase()
+      , date: date
+      , contentType: self.getHeader('content-type') || ''
+      , md5: self.getHeader('content-md5') || ''
+      , amazonHeaders: aws2.canonicalizeHeaders(self.headers)
+      }
+    var path = self.uri.path
+    if (opts.bucket && path) {
+      auth.resource = '/' + opts.bucket + path
+    } else if (opts.bucket && !path) {
+      auth.resource = '/' + opts.bucket
+    } else if (!opts.bucket && path) {
+      auth.resource = path
+    } else if (!opts.bucket && !path) {
+      auth.resource = '/'
+    }
+    auth.resource = aws2.canonicalizeResource(auth.resource)
+    self.setHeader('authorization', aws2.authorization(auth))
+  }
+
+  return self
+}
+Request.prototype.httpSignature = function (opts) {
+  var self = this
+  httpSignature.signRequest({
+    getHeader: function(header) {
+      return self.getHeader(header, self.headers)
+    },
+    setHeader: function(header, value) {
+      self.setHeader(header, value)
+    },
+    method: self.method,
+    path: self.path
+  }, opts)
+  debug('httpSignature authorization', self.getHeader('authorization'))
+
+  return self
+}
+Request.prototype.hawk = function (opts) {
+  var self = this
+  self.setHeader('Authorization', hawk.client.header(self.uri, self.method, opts).field)
+}
+Request.prototype.oauth = function (_oauth) {
+  var self = this
+
+  self._oauth.onRequest(_oauth)
+
+  return self
+}
+
+Request.prototype.jar = function (jar) {
+  var self = this
+  var cookies
+
+  if (self._redirect.redirectsFollowed === 0) {
+    self.originalCookieHeader = self.getHeader('cookie')
+  }
+
+  if (!jar) {
+    // disable cookies
+    cookies = false
+    self._disableCookies = true
+  } else {
+    var targetCookieJar = (jar && jar.getCookieString) ? jar : globalCookieJar
+    var urihref = self.uri.href
+    //fetch cookie in the Specified host
+    if (targetCookieJar) {
+      cookies = targetCookieJar.getCookieString(urihref)
+    }
+  }
+
+  //if need cookie and cookie is not empty
+  if (cookies && cookies.length) {
+    if (self.originalCookieHeader) {
+      // Don't overwrite existing Cookie header
+      self.setHeader('cookie', self.originalCookieHeader + '; ' + cookies)
+    } else {
+      self.setHeader('cookie', cookies)
+    }
+  }
+  self._jar = jar
+  return self
+}
+
+
+// Stream API
+Request.prototype.pipe = function (dest, opts) {
+  var self = this
+
+  if (self.response) {
+    if (self._destdata) {
+      self.emit('error', new Error('You cannot pipe after data has been emitted from the response.'))
+    } else if (self._ended) {
+      self.emit('error', new Error('You cannot pipe after the response has been ended.'))
+    } else {
+      stream.Stream.prototype.pipe.call(self, dest, opts)
+      self.pipeDest(dest)
+      return dest
+    }
+  } else {
+    self.dests.push(dest)
+    stream.Stream.prototype.pipe.call(self, dest, opts)
+    return dest
+  }
+}
+Request.prototype.write = function () {
+  var self = this
+  if (self._aborted) {return}
+
+  if (!self._started) {
+    self.start()
+  }
+  return self.req.write.apply(self.req, arguments)
+}
+Request.prototype.end = function (chunk) {
+  var self = this
+  if (self._aborted) {return}
+
+  if (chunk) {
+    self.write(chunk)
+  }
+  if (!self._started) {
+    self.start()
+  }
+  self.req.end()
+}
+Request.prototype.pause = function () {
+  var self = this
+  if (!self.responseContent) {
+    self._paused = true
+  } else {
+    self.responseContent.pause.apply(self.responseContent, arguments)
+  }
+}
+Request.prototype.resume = function () {
+  var self = this
+  if (!self.responseContent) {
+    self._paused = false
+  } else {
+    self.responseContent.resume.apply(self.responseContent, arguments)
+  }
+}
+Request.prototype.destroy = function () {
+  var self = this
+  if (!self._ended) {
+    self.end()
+  } else if (self.response) {
+    self.response.destroy()
+  }
+}
+
+Request.defaultProxyHeaderWhiteList =
+  Tunnel.defaultProxyHeaderWhiteList.slice()
+
+Request.defaultProxyHeaderExclusiveList =
+  Tunnel.defaultProxyHeaderExclusiveList.slice()
+
+// Exports
+
+Request.prototype.toJSON = requestToJSON
+module.exports = Request