AuthenticationScheme 
    Enum values representing the authentication scheme.
Since
2.2
Entries
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                  Basic authentication scheme as defined in RFC 2617.
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                  Digest authentication scheme as defined in RFC 2617.
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                  Client Certificate Authentication (see RFC 2246).
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                  Server Trust Authentication.
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                  Client certificate PIN required for use. Since: 2.34
Functions
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                  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
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                  Returns an array containing the constants of this enum type, in the order they're declared.