nginx-http-auth-digest
                                
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                        Opaque field ignored
the opaque field is not used when generating challenges, nor is it validated when included in an authentication request. is this a significant omission? the spec makes it seem as though it only exists as a convenience to stash state in, but i could believe some software out there depends upon it...
See https://github.com/samizdatco/nginx-http-auth-digest/blob/bd1c86a8c838bfd63de67c896e2e36ae1070cdb3/bugs.txt#L22-L25