2.2.1 SASL_Mechanism_Supported

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The SASL_Mechanism_Supported message is used in place of a server challenge that contains no data, as specified in [RFC4954] section 4. The format of this message is specified by the following Augmented Backus-Naur Form (ABNF) notation.

 mechanism_supported = "334" SP mechanism SP "supported"
 mechanism           = 1*20 mech_char
 mech_char           = %x41-5A / %x30-39 / %x2D / %x5F

The value of the mechanism ABNF rule is equal to the mechanism argument passed in the AUTH command by the client.