diff --git a/lib/auth.js b/lib/auth.js
index 2ac528d18..9a7639e49 100644
--- a/lib/auth.js
+++ b/lib/auth.js
@@ -1,6 +1,6 @@
 var Path = require('path')
   , crypto = require('crypto')
-  , UError = require('./error').UserError
+  , Error = require('http-errors')
   , Logger = require('./logger')
   , assert = require('assert')
 
@@ -65,10 +65,8 @@ function Auth(config) {
 		},
 
 		adduser: function(user, password, cb) {
-			if (config.users && config.users[user]) return cb(new UError({
-				status: 403,
-				message: 'this user already exists',
-			}))
+			if (config.users && config.users[user])
+				return cb(Error[403]('this user already exists'))
 
 			return cb()
 		},
@@ -76,17 +74,11 @@ function Auth(config) {
 
 	this.plugins.push({
 		authenticate: function(user, password, cb) {
-			return cb(new UError({
-				status: 403,
-				message: 'bad username/password, access denied',
-			}))
+			return cb(Error[403]('bad username/password, access denied'))
 		},
 
 		adduser: function(user, password, cb) {
-			return cb(new UError({
-				status: 409,
-				message: 'registration is disabled',
-			}))
+			return cb(Error[409]('registration is disabled'))
 		},
 	})
 }
diff --git a/lib/config.js b/lib/config.js
index 24f564fe1..6028d329a 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -2,7 +2,7 @@ var assert = require('assert')
   , crypto = require('crypto')
   , Path = require('path')
   , minimatch = require('minimatch')
-  , UError = require('./error').UserError
+  , Error = require('http-errors')
   , LocalList = require('./local-list')
   , utils = require('./utils')
 
diff --git a/lib/error.js b/lib/error.js
deleted file mode 100644
index 49d17c699..000000000
--- a/lib/error.js
+++ /dev/null
@@ -1,62 +0,0 @@
-var util = require('util')
-  , utils = require('./utils')
-
-function parse_error_params(params, status, message) {
-	if (typeof(params) === 'string') {
-		return {
-			message: params,
-			status: status,
-		}
-	} else if (typeof(params) === 'number') {
-		return {
-			message: message,
-			status: params,
-		}
-	} else if (utils.is_object(params)) {
-		if (params.message == null) params.message = message
-		if (params.status == null) params.status = status
-		return params
-	} else {
-		return {
-			message: message,
-			status: status,
-		}
-	}
-}
-
-/*
- *   Errors caused by malfunctioned code
- */
-var AppError = function(params, constr) {
-	Error.captureStackTrace(this, constr || this)
-	params = parse_error_params(params, 500, 'Internal server error')
-	this.message = params.message
-	this.status = params.status
-}
-util.inherits(AppError, Error)
-AppError.prototype.name = 'Application Error'
-
-/*
- *   Errors caused by wrong request
- */
-var UserError = function(params, constr) {
-	params = parse_error_params(params, 404, 'The requested resource was not found')
-	this.message = params.message
-	this.status = params.status
-}
-util.inherits(UserError, Error)
-UserError.prototype.name = 'User Error'
-
-/*
- *   Mimic filesystem errors
- */
-var FSError = function(code) {
-	this.code = code
-}
-util.inherits(UserError, Error)
-UserError.prototype.name = 'FS Error'
-
-module.exports.AppError = AppError
-module.exports.UserError = UserError
-module.exports.FSError = FSError
-
diff --git a/lib/index.js b/lib/index.js
index 2d2c7f507..192fa7dd4 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -3,7 +3,7 @@ var express = require('express')
   , utils = require('./utils')
   , Storage = require('./storage')
   , Config = require('./config')
-  , UError = require('./error').UserError
+  , Error = require('http-errors')
   , Middleware = require('./middleware')
   , Logger = require('./logger')
   , Cats = require('./status-cats')
@@ -39,15 +39,10 @@ module.exports = function(config_hash) {
 					} else {
 						var message = "can't "+action+" restricted package without auth, did you forget 'npm set always-auth true'?"
 					}
-					next(new UError({
-						status: 403,
-						message: message,
-					}))
+					next(Error[403](message))
 				} else {
-					next(new UError({
-						status: 403,
-						message: 'user '+req.remote_user.name+' not allowed to '+action+' it'
-					}))
+					next(Error[403]('user ' + req.remote_user.name
+					             + ' not allowed to ' + action + ' it'))
 				}
 			}
 		}
@@ -144,10 +139,7 @@ module.exports = function(config_hash) {
 				}
 			}
 
-			return next(new UError({
-				status: 404,
-				message: 'version not found: ' + req.params.version
-			}))
+			return next(Error[404]('version not found: ' + req.params.version))
 		})
 	})
 
@@ -205,20 +197,14 @@ module.exports = function(config_hash) {
 			})
 		} else {
 			if (typeof(req.body.name) !== 'string' || typeof(req.body.password) !== 'string') {
-				return next(new UError({
-					status: 400,
-					message: 'user/password is not found in request (npm issue?)',
-				}))
+				return next(Error[400]('user/password is not found in request (npm issue?)'))
 			}
 			auth.add_user(req.body.name, req.body.password, function(err) {
 				if (err) {
 					if (err.status < 500 && err.message === 'this user already exists') {
 						// with npm registering is the same as logging in
 						// so we replace message in case of conflict
-						return next(new UError({
-							status: 409,
-							message: 'bad username/password, access denied'
-						}))
+						return next(Error[409]('bad username/password, access denied'))
 					}
 					return next(err)
 				}
@@ -251,20 +237,14 @@ module.exports = function(config_hash) {
 		var name = req.params.package
 
 		if (Object.keys(req.body).length == 1 && utils.is_object(req.body.users)) {
-			return next(new UError({
-				// 501 status is more meaningful, but npm doesn't show error message for 5xx
-				status: 404,
-				message: 'npm star|unstar calls are not implemented',
-			}))
+			// 501 status is more meaningful, but npm doesn't show error message for 5xx
+			return next(Error[404]('npm star|unstar calls are not implemented'))
 		}
 
 		try {
 			var metadata = utils.validate_metadata(req.body, name)
 		} catch(err) {
-			return next(new UError({
-				status: 422,
-				message: 'bad incoming package data',
-			}))
+			return next(Error[422]('bad incoming package data'))
 		}
 
 		if (req.params._rev) {
@@ -298,10 +278,7 @@ module.exports = function(config_hash) {
 
 				// npm is doing something strange again
 				// if this happens in normal circumstances, report it as a bug
-				return next(new UError({
-					status: 400,
-					message: 'unsupported registry call',
-				}))
+				return next(Error[400]('unsupported registry call'))
 			}
 
 			if (err && err.status != 409) return next(err)
diff --git a/lib/local-fs.js b/lib/local-fs.js
index 1c865e384..e6a0e91ae 100644
--- a/lib/local-fs.js
+++ b/lib/local-fs.js
@@ -2,7 +2,13 @@ var fs = require('fs')
   , Path = require('path')
   , mkdirp = require('mkdirp')
   , mystreams = require('./streams')
-  , FSError = require('./error').FSError
+  , Error = require('http-errors')
+
+function FSError(code) {
+	var err = Error(code)
+	err.code = code
+	return err
+}
 
 try {
 	var fsExt = require('fs-ext')
@@ -44,7 +50,7 @@ function write_stream(name) {
 	})
 
 	fs.exists(name, function(exists) {
-		if (exists) return stream.emit('error', new FSError('EEXISTS'))
+		if (exists) return stream.emit('error', FSError('EEXISTS'))
 
 		var tmpname = name + '.tmp-'+String(Math.random()).replace(/^0\./, '')
 		  , file = fs.createWriteStream(tmpname)
@@ -114,14 +120,14 @@ function read_stream(name, stream, callback) {
 
 function create(name, contents, callback) {
 	fs.exists(name, function(exists) {
-		if (exists) return callback(new FSError('EEXISTS'))
+		if (exists) return callback(FSError('EEXISTS'))
 		write(name, contents, callback)
 	})
 }
 
 function update(name, contents, callback) {
 	fs.exists(name, function(exists) {
-		if (!exists) return callback(new FSError('ENOENT'))
+		if (!exists) return callback(FSError('ENOENT'))
 		write(name, contents, callback)
 	})
 }
@@ -167,7 +173,7 @@ function lock_and_read(name, callback) {
 			var buffer = new Buffer(st.size)
 			fs.read(fd, buffer, 0, st.size, null, function(err, bytesRead, buffer) {
 				if (err) return callback(err)
-				if (bytesRead != st.size) return callback(new Error('st.size != bytesRead'), fd)
+				if (bytesRead != st.size) return callback(Error('st.size != bytesRead'), fd)
 
 				callback(null, fd, buffer)
 			})
diff --git a/lib/local-storage.js b/lib/local-storage.js
index 741ee3157..0cd8e4423 100644
--- a/lib/local-storage.js
+++ b/lib/local-storage.js
@@ -3,7 +3,7 @@ var fs = require('fs')
   , crypto = require('crypto')
   , assert = require('assert')
   , fs_storage = require('./local-fs')
-  , UError = require('./error').UserError
+  , Error = require('http-errors')
   , utils = require('./utils')
   , mystreams = require('./streams')
   , Logger = require('./logger')
@@ -41,26 +41,17 @@ Storage.prototype._internal_error = function(err, file, message) {
 	this.logger.error( {err: err, file: file}
 	                 , message + ' @{file}: @{!err.message}'
 	                 )
-	return new UError({
-		status: 500,
-		message: 'internal server error'
-	})
+	return Error[500]()
 }
 
 Storage.prototype.add_package = function(name, info, callback) {
 	var self = this
 	var storage = this.storage(name)
-	if (!storage) return callback(new UError({
-		status: 404,
-		message: 'this package cannot be added'
-	}))
+	if (!storage) return callback(Error[404]('this package cannot be added'))
 
 	storage.create_json(info_file, get_boilerplate(name), function(err) {
 		if (err && err.code === 'EEXISTS') {
-			return callback(new UError({
-				status: 409,
-				message: 'this package is already present'
-			}))
+			return callback(Error[409]('this package is already present'))
 		}
 
 		var latest = info['dist-tags'].latest
@@ -76,17 +67,12 @@ Storage.prototype.remove_package = function(name, callback) {
 	self.logger.info({name: name}, 'unpublishing @{name} (all)')
 
 	var storage = self.storage(name)
-	if (!storage) return callback(new UError({
-		status: 404,
-		message: 'no such package available',
-	}))
+	if (!storage) return callback(Error[404]('no such package available'))
+
 	storage.read_json(info_file, function(err, data) {
 		if (err) {
 			if (err.code === 'ENOENT') {
-				return callback(new UError({
-					status: 404,
-					message: 'no such package available',
-				}))
+				return callback(Error[404]('no such package available'))
 			} else {
 				return callback(err)
 			}
@@ -222,10 +208,7 @@ Storage.prototype.add_version = function(name, version, metadata, tag, callback)
 		delete metadata.readme
 
 		if (data.versions[version] != null) {
-			return cb(new UError({
-				status: 409,
-				message: 'this version already present'
-			}))
+			return cb(Error[409]('this version already present'))
 		}
 
 		// if uploaded tarball has a different shasum, it's very likely that we have some kind of error
@@ -234,10 +217,9 @@ Storage.prototype.add_version = function(name, version, metadata, tag, callback)
 			if (utils.is_object(data._attachments[tarball])) {
 				if (data._attachments[tarball].shasum != null && metadata.dist.shasum != null) {
 					if (data._attachments[tarball].shasum != metadata.dist.shasum) {
-						return cb(new UError({
-							status: 400,
-							message: 'shasum error, ' + data._attachments[tarball].shasum + ' != ' + metadata.dist.shasum,
-						}))
+						return cb(Error[400]('shasum error, '
+						                   + data._attachments[tarball].shasum
+						                   + ' != ' + metadata.dist.shasum))
 					}
 				}
 
@@ -258,10 +240,7 @@ Storage.prototype.add_tags = function(name, tags, callback) {
 	self.update_package(name, function updater(data, cb) {
 		for (var t in tags) {
 			if (data.versions[tags[t]] == null) {
-				return cb(new UError({
-					status: 404,
-					message: "this version doesn't exist"
-				}))
+				return cb(Error[404]("this version doesn't exist"))
 			}
 
 			utils.tag_version(data, tags[t], t, self.config)
@@ -280,10 +259,7 @@ Storage.prototype.change_package = function(name, metadata, revision, callback)
 	var self = this
 
 	if (!utils.is_object(metadata.versions) || !utils.is_object(metadata['dist-tags'])) {
-		return callback(new UError({
-			status: 422,
-			message: 'bad data',
-		}))
+		return callback(Error[422]('bad data'))
 	}
 
 	self.update_package(name, function updater(data, cb) {
@@ -316,10 +292,7 @@ Storage.prototype.remove_tarball = function(name, filename, revision, callback)
 			delete data._attachments[filename]
 			cb()
 		} else {
-			cb(new UError({
-				status: 404,
-				message: 'no such file available',
-			}))
+			cb(Error[404]('no such file available'))
 		}
 	}, function(err) {
 		if (err) return callback(err)
@@ -347,10 +320,7 @@ Storage.prototype.add_tarball = function(name, filename) {
 	var self = this
 	if (name === info_file || name === '__proto__') {
 		process.nextTick(function() {
-			stream.emit('error', new UError({
-				status: 403,
-				message: 'can\'t use this filename'
-			}))
+			stream.emit('error', Error[403]("can't use this filename"))
 		})
 		return stream
 	}
@@ -358,10 +328,7 @@ Storage.prototype.add_tarball = function(name, filename) {
 	var storage = self.storage(name)
 	if (!storage) {
 		process.nextTick(function() {
-			stream.emit('error', new UError({
-				status: 404,
-				message: 'can\'t upload this package'
-			}))
+			stream.emit('error', Error[404]("can't upload this package"))
 		})
 		return stream
 	}
@@ -370,10 +337,7 @@ Storage.prototype.add_tarball = function(name, filename) {
 
 	wstream.on('error', function(err) {
 		if (err.code === 'EEXISTS') {
-			stream.emit('error', new UError({
-				status: 409,
-				message: 'this tarball is already present'
-			}))
+			stream.emit('error', Error[409]('this tarball is already present'))
 		} else if (err.code === 'ENOENT') {
 			// check if package exists to throw an appropriate message
 			self.get_package(name, function(_err, res) {
@@ -411,10 +375,7 @@ Storage.prototype.add_tarball = function(name, filename) {
 	}
 	stream.done = function() {
 		if (!length) {
-			stream.emit('error', new UError({
-				status: 422,
-				message: 'refusing to accept zero-length file'
-			}))
+			stream.emit('error', Error[422]('refusing to accept zero-length file'))
 			wstream.abort()
 		} else {
 			wstream.done()
@@ -440,7 +401,6 @@ Storage.prototype.get_readme = function(name, version, callback) {
 		if (exists) {
 			returnReadme();
 		} else {
-debugger
 			self.unpack_tarball(fileName, function(err) {
 				returnReadme();
 			});
@@ -455,7 +415,7 @@ debugger
 			callback(data)
 		})
 	}
-};
+}
 
 Storage.prototype.get_tarball = function(name, filename, callback) {
 	assert(utils.validate_name(filename))
@@ -469,10 +429,7 @@ Storage.prototype.get_tarball = function(name, filename, callback) {
 	var storage = self.storage(name)
 	if (!storage) {
 		process.nextTick(function() {
-			stream.emit('error', new UError({
-				status: 404,
-				message: 'no such file available',
-			}))
+			stream.emit('error', Error[404]('no such file available'))
 		})
 		return stream
 	}
@@ -480,10 +437,7 @@ Storage.prototype.get_tarball = function(name, filename, callback) {
 	var rstream = storage.read_stream(filename)
 	rstream.on('error', function(err) {
 		if (err && err.code === 'ENOENT') {
-			stream.emit('error', new UError({
-				status: 404,
-				message: 'no such file available',
-			}))
+			stream.emit('error', Error(404, 'no such file available'))
 		} else {
 			stream.emit('error', err)
 		}
@@ -504,18 +458,12 @@ Storage.prototype.get_package = function(name, options, callback) {
 
 	var self = this
 	var storage = self.storage(name)
-	if (!storage) return callback(new UError({
-		status: 404,
-		message: 'no such package available'
-	}))
+	if (!storage) return callback(Error[404]('no such package available'))
 
 	storage.read_json(info_file, function(err, result) {
 		if (err) {
 			if (err.code === 'ENOENT') {
-				return callback(new UError({
-					status: 404,
-					message: 'no such package available'
-				}))
+				return callback(Error[404]('no such package available'))
 			} else {
 				return callback(self._internal_error(err, info_file, 'error reading'))
 			}
@@ -575,10 +523,7 @@ Storage.prototype.get_recent_packages = function(startkey, callback) {
 Storage.prototype.update_package = function(name, updateFn, _callback) {
 	var self = this
 	var storage = self.storage(name)
-	if (!storage) return _callback(new UError({
-		status: 404,
-		message: 'no such package available',
-	}))
+	if (!storage) return _callback(Error[404]('no such package available'))
 	storage.lock_and_read_json(info_file, function(err, fd, json) {
 		function callback() {
 			var _args = arguments
@@ -594,15 +539,9 @@ Storage.prototype.update_package = function(name, updateFn, _callback) {
 
 		if (err) {
 			if (err.code === 'EAGAIN') {
-				return callback(new UError({
-					status: 503,
-					message: 'resource temporarily unavailable'
-				}))
+				return callback(Error[503]('resource temporarily unavailable'))
 			} else if (err.code === 'ENOENT') {
-				return callback(new UError({
-					status: 404,
-					message: 'no such package available',
-				}))
+				return callback(Error[404]('no such package available'))
 			} else {
 				return callback(err)
 			}
diff --git a/lib/logger.js b/lib/logger.js
index 5a093be29..753085ae8 100644
--- a/lib/logger.js
+++ b/lib/logger.js
@@ -1,4 +1,5 @@
 var Logger = require('bunyan')
+  , Error = require('http-errors')
   , Stream = require('stream')
   , utils = require('./utils')
 
@@ -49,7 +50,7 @@ module.exports.setup = function(logs) {
 				}
 			}
 		} else {
-			throw new Error('wrong target type for a log')
+			throw Error('wrong target type for a log')
 		}
 
 		if (target.level === 'http') target.level = 35
diff --git a/lib/middleware.js b/lib/middleware.js
index 60339a0ba..2e47657e9 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -1,6 +1,6 @@
 var crypto = require('crypto')
+  , Error = require('http-errors')
   , utils = require('./utils')
-  , UError = require('./error').UserError
   , Logger = require('./logger')
 
 module.exports.validate_name = function validate_name(req, res, next, value, name) {
@@ -10,20 +10,15 @@ module.exports.validate_name = function validate_name(req, res, next, value, nam
 	} else if (utils.validate_name(value)) {
 		next()
 	} else {
-		next(new UError({
-			status: 403,
-			message: 'invalid ' + name,
-		}))
+		next(Error[403]('invalid ' + name))
 	}
 }
 
 module.exports.media = function media(expect) {
 	return function(req, res, next) {
 		if (req.headers['content-type'] !== expect) {
-			next(new UError({
-				status: 415,
-				message: 'wrong content-type, expect: '+expect+', got: '+req.headers['content-type'],
-			}))
+			next(Error[415]('wrong content-type, expect: ' + expect
+			              + ', got: '+req.headers['content-type']))
 		} else {
 			next()
 		}
@@ -47,10 +42,7 @@ module.exports.anti_loop = function(config) {
 			for (var i=0; i<arr.length; i++) {
 				var m = arr[i].match(/\s*(\S+)\s+(\S+)/)
 				if (m && m[2] === config.server_id) {
-					return next(new UError({
-						status: 508,
-						message: 'loop detected',
-					}))
+					return next(Error[508]('loop detected'))
 				}
 			}
 		}
diff --git a/lib/storage.js b/lib/storage.js
index e5f47944e..50f8ebae9 100644
--- a/lib/storage.js
+++ b/lib/storage.js
@@ -1,6 +1,6 @@
 var async = require('async')
   , assert = require('assert')
-  , UError = require('./error').UserError
+  , Error = require('http-errors')
   , Local = require('./local-storage')
   , Proxy = require('./up-storage')
   , mystreams = require('./streams')
@@ -63,10 +63,7 @@ Storage.prototype.add_package = function(name, metadata, callback) {
 			if (err && err.status !== 404) return cb(err)
 
 			if (results) {
-				return cb(new UError({
-					status: 409,
-					message: 'this package is already present'
-				}))
+				return cb(Error[409]('this package is already present'))
 			}
 
 			cb()
@@ -80,10 +77,7 @@ Storage.prototype.add_package = function(name, metadata, callback) {
 
 			// checking package
 			if (results) {
-				return cb(new UError({
-					status: 409,
-					message: 'this package is already present'
-				}))
+				return cb(Error[409]('this package is already present'))
 			}
 
 			for (var i=0; i<err_results.length; i++) {
@@ -91,10 +85,7 @@ Storage.prototype.add_package = function(name, metadata, callback) {
 				// if uplink fails with a status other than 404, we report failure
 				if (err_results[i][0] != null) {
 					if (err_results[i][0].status !== 404) {
-						return cb(new UError({
-							status: 503,
-							message: 'one of the uplinks is down, refuse to publish'
-						}))
+						return cb(Error[503]('one of the uplinks is down, refuse to publish'))
 					}
 				}
 			}
@@ -491,7 +482,7 @@ Storage.prototype._sync_package_with_uplinks = function(name, pkginfo, options,
 			if (err && err.status === 304)
 				pkginfo._uplinks[up.upname].fetched = Date.now()
 
-			if (err || !up_res) return cb(null, [err || new Error('no data')])
+			if (err || !up_res) return cb(null, [err || Error('no data')])
 
 			try {
 				utils.validate_metadata(up_res, name)
@@ -527,10 +518,9 @@ Storage.prototype._sync_package_with_uplinks = function(name, pkginfo, options,
 		assert(!err && Array.isArray(uplink_errors))
 
 		if (!exists) {
-			return callback(new UError({
-				status: 404,
-				message: 'no such package available'
-			}), null, uplink_errors)
+			return callback( Error[404]('no such package available')
+			               , null
+			               , uplink_errors )
 		}
 
 		self.local.update_versions(name, pkginfo, function(err, pkginfo) {
diff --git a/lib/up-storage.js b/lib/up-storage.js
index 0684a5e01..263499945 100644
--- a/lib/up-storage.js
+++ b/lib/up-storage.js
@@ -2,7 +2,7 @@ var URL = require('url')
   , request = require('request')
   , Stream = require('stream')
   , zlib = require('zlib')
-  , UError = require('./error').UserError
+  , Error = require('http-errors')
   , mystreams = require('./streams')
   , Logger = require('./logger')
   , utils = require('./utils')
@@ -101,8 +101,8 @@ Storage.prototype.request = function(options, cb) {
 	if (!this.status_check()) {
 		var req = new Stream.Readable()
 		process.nextTick(function() {
-			if (typeof(cb) === 'function') cb(new Error('uplink is offline'))
-			req.emit('error', new Error('uplink is offline'))
+			if (typeof(cb) === 'function') cb(Error('uplink is offline'))
+			req.emit('error', Error('uplink is offline'))
 		})
 		// preventing 'Uncaught, unspecified "error" event'
 		req.on('error', function(){})
@@ -265,14 +265,11 @@ Storage.prototype.get_package = function(name, options, callback) {
 	}, function(err, res, body) {
 		if (err) return callback(err)
 		if (res.statusCode === 404) {
-			return callback(new UError({
-				message: 'package doesn\'t exist on uplink',
-				status: 404,
-			}))
+			return callback(Error[404]("package doesn't exist on uplink"))
 		}
 		if (!(res.statusCode >= 200 && res.statusCode < 300)) {
-			var error = new Error('bad status code: ' + res.statusCode)
-			error.status = res.statusCode
+			var error = Error('bad status code: ' + res.statusCode)
+			error.remoteStatus = res.statusCode
 			return callback(error)
 		}
 		callback(null, body, res.headers.etag)
@@ -299,16 +296,10 @@ Storage.prototype.get_url = function(url) {
 
 	rstream.on('response', function(res) {
 		if (res.statusCode === 404) {
-			return stream.emit('error', new UError({
-				message: 'file doesn\'t exist on uplink',
-				status: 404,
-			}))
+			return stream.emit('error', Error[404]("file doesn't exist on uplink"))
 		}
 		if (!(res.statusCode >= 200 && res.statusCode < 300)) {
-			return stream.emit('error', new UError({
-				message: 'bad uplink status code: ' + res.statusCode,
-				status: 500,
-			}))
+			return stream.emit('error', Error('bad uplink status code: ' + res.statusCode))
 		}
 		if (res.headers['content-length']) {
 			expected_length = res.headers['content-length']
@@ -327,7 +318,7 @@ Storage.prototype.get_url = function(url) {
 	rstream.on('end', function(d) {
 		if (d) current_length += d.length
 		if (expected_length && current_length != expected_length)
-			stream.emit('error', new Error('content length mismatch'))
+			stream.emit('error', Error('content length mismatch'))
 	})
 	return stream
 }
diff --git a/package.yaml b/package.yaml
index b4205dabe..caca258f5 100644
--- a/package.yaml
+++ b/package.yaml
@@ -28,6 +28,7 @@ dependencies:
   cookies: '>=0.5.0 <1.0.0-0'
   request: '>=2.31.0 <3.0.0-0'
   async: '>=0.9.0 <1.0.0-0'
+  http-errors: '~1.2.0' # ferver
 
   # 2.x and 3.x have the same interface
   semver: '>=2.2.1 <4.0.0-0'