Fix url starting with double slash

lib/build.js

@@ -11,6 +11,7 @@ import webpack from 'webpack'
 import serialize from 'serialize-javascript'
 import { createBundleRenderer } from 'vue-server-renderer'
 import { join, resolve, sep } from 'path'
+import { isUrl } from './utils'
 import clientWebpackConfig from './webpack/client.config.js'
 import serverWebpackConfig from './webpack/server.config.js'
 import chalk from 'chalk'
@@ -86,7 +87,7 @@ export function options () {
   if (this.options.build && !Array.isArray(this.options.build.loaders)) extraDefaults.loaders = defaultsLoaders
   if (this.options.build && !Array.isArray(this.options.build.postcss)) extraDefaults.postcss = defaultsPostcss
   this.options.build = _.defaultsDeep(this.options.build, defaults, extraDefaults)
-  if (this.options.build.publicPath.indexOf('http') === 0 && this.dev) {
+  if (this.dev && isUrl(this.options.build.publicPath)) {
     this.options.build.publicPath = defaults.publicPath
   }
   // Production, create server-renderer

lib/generate.js

@@ -7,7 +7,7 @@ import pify from 'pify'
 import pathToRegexp from 'path-to-regexp'
 import _ from 'lodash'
 import { resolve, join, dirname, sep } from 'path'
-import { promisifyRouteParams } from './utils'
+import { isUrl, promisifyRouteParams } from './utils'
 import { minify } from 'html-minifier'
 const copy = pify(fs.copy)
 const remove = pify(fs.remove)
@@ -29,7 +29,7 @@ export default function () {
   var srcStaticPath = resolve(this.srcDir, 'static')
   var srcBuiltPath = resolve(this.dir, '.nuxt', 'dist')
   var distPath = resolve(this.dir, this.options.generate.dir)
-  var distNuxtPath = join(distPath, (this.options.build.publicPath.indexOf('http') === 0 ? '_nuxt' : this.options.build.publicPath))
+  var distNuxtPath = join(distPath, (isUrl(this.options.build.publicPath) ? '_nuxt' : this.options.build.publicPath))
   return co(function * () {
     /*
     ** Launch build process

lib/utils.js

@@ -31,6 +31,10 @@ export function urlJoin () {
   return [].slice.call(arguments).join('/').replace(/\/+/g, '/').replace(':/', '://')
 }
 
+export function isUrl (url) {
+  return (url.indexOf('http') === 0 || url.indexOf('//') === 0)
+}
+
 export function promisifyRouteParams (fn) {
   // If routeParams[route] is an array
   if (Array.isArray(fn)) {

lib/webpack/base.config.js

@@ -3,7 +3,7 @@
 import vueLoaderConfig from './vue-loader.config'
 import { defaults } from 'lodash'
 import { join } from 'path'
-import { urlJoin } from '../utils'
+import { isUrl, urlJoin } from '../utils'
 
 /*
 |--------------------------------------------------------------------------
@@ -21,7 +21,7 @@ export default function ({ isClient, isServer }) {
       vendor: ['vue', 'vue-router', 'vue-meta']
     },
     output: {
-      publicPath: (this.options.build.publicPath.indexOf('http') === 0 ? this.options.build.publicPath : urlJoin(this.options.router.base, this.options.build.publicPath))
+      publicPath: (isUrl(this.options.build.publicPath) ? this.options.build.publicPath : urlJoin(this.options.router.base, this.options.build.publicPath))
     },
     performance: {
       hints: (this.dev ? false : 'warning')