Personally Identifiable Information (PII) can't be delivered via a property that uses any form of Protocol Downgrade—Enhanced TLS or Standard TLS. PII is any information about an individual maintained by an agency. This includes the following:
Information that can be used to distinguish or trace an individual's identity. This includes an individual's name, social security number, date and place of birth, mother's maiden name, or biometric records.
Other information that is linked or linkable to an individual. This includes medical, educational, financial, and employment information.
If you include it in your property, and then add either the Protocol Downgrade (Enhanced TLS) or Protocol Downgrade (HTTPS Downgrade to Origin - Standard TLS) behaviors anywhere in the configuration, an error is raised. You won't be able to save the configuration until that rule, or either behavior, is removed.
Check out this reference for more information on personally identifiable information (PII).
Updated 12 months ago