SEO Tip #127: Is Google Able To Crawl Protocols Other Than HTTP and HTTPS?
Matt Cutts: I believe the answer is yes. I believe we have support to crawl FTP but really that’s pretty far off the beaten path. So if at all possible I would try to make sure that your pages are HTTP or HTTPS.
We did build a crawler way back in the day with the support for multiple protocols so the ability to crawl everything from WML and WAP and stuff
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