OPeNDAP servers like Hyrax and TDS can easily support common single-sign-on authentication protocols using the Apache httpd and related software; adding support for these protocols to clients can be more challenging

James H R Gallagher, OPeNDAP, Inc., Butte, United States, Nathan Potter, OPeNDAP, Inc., Butte, MT, United States and Benjamin James Kingston Evans, Australian National University, Canberra, ACT, Australia
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