3.2.5 Message Processing Events and Sequencing Rules

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The server MUST parse the received frame and extract the value of the frame-masked field ([RFC6455] sections 5.2) as specified in [RFC6455] section 45.3. If the value of the accept-unmasked-frame ADM element is false, then the behavior is unchanged from that specified in [RFC6455]. If the value of accept-unmasked-frame is true, the frame MUST be accepted by the server even if the Mask bit ([RFC6455] section 4.2) is set to zero.