MSDN has a has a great listing of the protocol handlers that are supported out of the box and explains that weird “SPS” syntax you might see in your search crawl settings. Here is the MSDN article “Plan to crawl content”.
| Protocol handler | Used to crawl |
| Bdc | Business Data Catalog |
| Bdc2 | Business Data Catalog URLs (internal protocol) |
| File | File shares |
| http | Web sites |
| https | Web sites over Secure Sockets Layer (SSL) |
| Notes | Lotus Notes databases |
| Rb | Exchange public folders |
| Rbs | Exchange public folders over SSL |
| Sps | People profiles from Windows SharePoint Services 2.0 server farms |
| Sps3 | People profile crawls of Windows SharePoint Services 3.0 server farms only |
| Sps3s | People profile crawls from Windows SharePoint Services 3.0 server farms only over SSL |
| Spsimport | People profile import |
| Spss | People profile import from Windows SharePoint Services 2.0 server farms over SSL |
| Sts | Windows SharePoint Services 3.0 root URLs (internal protocol) |
| Sts2 | Windows SharePoint Services 2.0 sites |
| Sts2s | Windows SharePoint Services 2.0 sites over SSL |
| Sts3 | Windows SharePoint Services 3.0 sites |
| Sts3s | Windows SharePoint Services 3.0 sites over SSL |
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