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HTTP Header Principal Provider

HttpHeaderPrinciaplProvider HttpHeaderPrincipalProvider is an example Principal Provider that obtains its initial set of principals from HTTP header requests instead of from the repo.xml file. As with the other PrincipalProvider classes, it processes a given username/role against the list of principals using the equals() member function and returns a boolean value to signify if the given username/role was present in the principals (true is present, false if otherwise).