From a2d069805e1eb2e0fdd8db1a0b877f3ea4f04126 Mon Sep 17 00:00:00 2001
From: Andreas <andreas@starweb.se>
Date: Fri, 25 Sep 2015 15:41:44 +0200
Subject: [PATCH] Protocol relative url support for build url helper Closes
 #1026

---
 src/Helpers.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Helpers.php b/src/Helpers.php
index 6dac3916b..996a99c4a 100644
--- a/src/Helpers.php
+++ b/src/Helpers.php
@@ -80,8 +80,11 @@ public static function build_url($protocol, $host, $base_path, $url)
             return $ret;
         }
 
-        //remote urls with backslash in html/css are not really correct, but lets be genereous
-        if ($url[0] === '/' || $url[0] === '\\') {
+        // Protocol relative urls (e.g. "//example.org/style.css")
+        if (strpos($url, '//') === 0) {
+            $ret .= substr($url, 2);
+            //remote urls with backslash in html/css are not really correct, but lets be genereous
+        } elseif ($url[0] === '/' || $url[0] === '\\') {
             // Absolute path
             $ret .= $host . $url;
         } else {