TYPO3 Core

I have see many unusual failure url log in realurl.

Finally, I have discovery that so many common search engine do not read <base> tag for <frameset>.
e.g. yahoo, baidu; largest search engines in china

I am not sure it is wrong / right implement of their spider.
But I think typo3 should handle this case carefully.

Typo3 should
replacing site absolute url(i.e. start with / )
or complete absolute url(i.e. start with http:// )
in <frame src >

(issue imported from #M2157)