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HTTP BASIC authentication.
@see: U{http://tools.ietf.org/html/rfc1945}
@see: U{http://tools.ietf.org/html/rfc2616}
@see: U{http://tools.ietf.org/html/rfc2617}
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Credential Factory for HTTP Basic Authentication
@type authenticationRealm: L{bytes}
@ivar authenticationRealm: The HTTP authentication realm which will be issued in
challenges.
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Return a challenge including the HTTP authentication realm with which
this factory was created.
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Parse the base64-encoded, colon-separated username and password into a
L{credentials.UsernamePassword} instance.
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