Malformed dns-prefetch tag when using CDN's "auto-balance over multiple CDNs" feature

well, just one clarification

i understand that avoiding http before the url is fine.

but placing the same at the end of the url, separated by a space, is it also designed so? i could not find any example in such format, nor in the provided link. Apologoes in advance if this is not a bug.

<link rel="dns-prefetch" href="//img1.mycdn.com http" />

the "http" after mycdn.com is what i am talking about,.

cdn mapping
http://img1.mydomain.com http://img2.mydomain.com http://img3.mydomain.com|.css .jpg .jpeg .png .gif

did some debugging

the trailing http is being addded to the domain here at

 if (strpos($line, '|') !== FALSE) {
        $parts = explode('|', $line);
        $domains[] = parse_url(trim($parts[0]), PHP_URL_HOST);
      }

This happens when there are multiple domains mentioned in the same line

Either the code must be modified to handle multiple domains in the same line or the documentation in advanced_help should be updated , removing the example of mentioning multiple domains in same line

Quote from advanced help of cdn module

This would serve CSS and JS files from CDN A, images from either CDN B or C and everything else from CDN C: 
http://cdn-a.com|.css .js
http://cdn-b.com http://cdn-c.com|.jpg .jpeg .png
http://cdn-c.com

As mentioned in the above advanced_help, if the below format is used, then the http from the second domain is being added to the end of first domain and the dns prefetch tag is shown incorrect..
http://cdn-b.com http://cdn-c.com|.jpg .jpeg .png

attached is a patch to the advanced help
its an svn diff though

//#4: wow, no, that's definitely a bug. But I'm not seeing that on either http://wimleers.com (D7) nor http://driverpacks.net (D6).

I believe you are not seeing the issue on mentioned sites because they have the domains mapped in multiple lines

The issue seems to happen when there is more than 1 domain in each line of the CDN mapping ,. example:
http://img1.mydomain.com http://img2.mydomain.com http://img3.mydomain.com|.css .jpg .jpeg .png .gif

This can be avoided by

http://img1.mydomain.com|.css .jpg .jpeg .png .gif
http://img2.mydomain.com|.css .jpg .jpeg .png .gif
http://img3.mydomain.com|.css .jpg .jpeg .png .gif

This could be either fixed in the code,. or the advanced help could be updated removing the example of mapping multiple domains in single line