This header is supposed to set P3P policy, in the form of P3P:CP="your_compact_policy". However, P3P did not take off,[24] most browsers have never fully implemented it, a lot of websites set this header with fake policy text, that was enough to fool browsers the existence of P3P policy and grant permissions for third party cookies. P3P: CP="This is not a P3P policy!

'Declaration
 
Public Shared ReadOnly P3P As NHttpHeaderFieldName

'Usage
 
Dim value As NHttpHeaderFieldName
 
value = NHttpHeaderFieldName.P3P

public static readonly NHttpHeaderFieldName P3P