Currently Domino HTTP Basic Authentication Passwords need to be encoded in ISO-8859-1.
Many other systems allow to use UTF.8. The standard is unclear but there is a specification where you can announce which encoding the server expects.
See https://tools.ietf.org/html/rfc7617 for details.
Since 2015 there is RFC 7617, which obsoletes RFC 2617. In contrast to the old RFC, the new RFC explicitly defines the character encoding to be used for username and password.
charset="UTF-8"in its challenge, like this:
WWW-Authenticate: Basic realm="myChosenRealm", charset="UTF-8"
Support gave me the following, existing enhancement request today.
The business case behind it is that we need authentication with passwords containing umlauts for mobile devices.
Once we have this enhancements, we need the mobile applications also to support UTF-8 in the same way.
SPR # DKENAJTT9G :Enhancement: Non-ASCII UTF-8 passwords don't work over basicAuth