About using non-HTTP protocol links
While Studio does not prevent you from inserting links that use a non-HTTP protocol, such as file:// or ftp://, using these types of links is not recommended.
Recommendations for attribute values that are complete URLs
It is possible that your source data contains complete URLs (including the protocol, host, port, and path) that are ingested into the Endeca Server when the data is loaded. For example, company data could include links to pages on the company web site.