Is there a way to have header_pages redirect to another site?

[ac639]

Is there a way to create a header bar "page" such as YOUTUBE or TWITTER, that when clicked, immediately redirect to another website instead of just to another page? Currently, the only way I see to add items to the header is to edit _config.yml and add an entry in header_pages: but that means it will direct me to a page whereas I want a link.

I did try manually adding a redirect in a custom .html page and even with another .html file in _includes but it only gives me a blank/white page.