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Hmm, Opera doesn't seem to like doing HTTP auth with a password with high ASCII (ÁÉÍÓÚ and friends). Curious. I thought HTTP was supposed to be 8-bit safe, and given that the password will be Base64 encoded anyway (if not hashed) they've got no excuse.
Edit: Well, either I'm mistyping the passwordor Firefox doesn't like them either (mistyped, Firefox works. Opera doesn't). How odd. Lemme check the RFC...
...yep, the username is defined as being 8-bit text excluding a ':' and the password is defined as any valid 8-bit text. The only characters not permitted are non-white-space control codes (0 .. 31). The spec even says to assume ISO-8859-1 for high ASCII.
Right, let's have a look with a packet sniffer...
...ah-hah! Opera transmits accented characters in some sort of multi-byte encoding (probably UTF-8), and there doesn't appear to be a setting to change this. Bad Opera.
Edit: Well, either I'm mistyping the password
...yep, the username is defined as being 8-bit text excluding a ':' and the password is defined as any valid 8-bit text. The only characters not permitted are non-white-space control codes (0 .. 31). The spec even says to assume ISO-8859-1 for high ASCII.
Right, let's have a look with a packet sniffer...
...ah-hah! Opera transmits accented characters in some sort of multi-byte encoding (probably UTF-8), and there doesn't appear to be a setting to change this. Bad Opera.

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Ahhh, hmm, can you set a charset=iso-8859-1 somehow in this? I never used it, so I have no idea about how it works, what HTTP headers are in work here, etc. Could be a way out though.
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