swf property doesn't correctly handle protocol relative urls

[Michael]

Using a protocol relative url to load the FlashTransport swf causes the resolveUrl function to return a bad URL.

Example:
Given //assets.example.com/path/to/swf.swf, resolveUrl returns http://localhost//assets.example.com/path/to/swf.swf

This is because the regular expression inside the if statement (!url.match(/^(http||https):\/\//)) checks explicitly for http or https, and doesn't handle the url starting with //

[Louis Chatriot]

@oyvindkinsey We have the exact same problem, also caused by resolveUrl. However the solution proposed by @EmJay1988 doesnt work for us. I think the easiest way to solve it is to add a special test case for protocol relative URLs, like this :

// If the url is already a valid absolute URL we do nothing
if (!url.match(/^(http||https):\/\//)) {
    // If the url is a protocol relative URL, we simply append the protocol to it
    if (url.match(/^\/\//)) {
      url = location.protocol + url;
    } else {
      // If this is a relative path
      var path = (url.substring(0, 1) === "/") ? "" : location.pathname;
      if (path.substring(path.length - 1) !== "/") {
        path = path.substring(0, path.lastIndexOf("/") + 1);
      }
      url = location.protocol + "//" + location.host + path + url;
    }
}

I would like to hear your thoughts about this !

I have added my colleagues to this discussion: @czzarr @charlesmigli