The authentication scheme to use when server authorization is required.
authBasic(0), authDigest(1), authProprietary(2), authNone(3), authNtlm(4), authNegotiate(5), authOAuth(6)
This property should be set to authNone (3) when no authentication is to be performed.
By default, this property is authBasic (0), and if the User and Password properties are set, the control will attempt basic authentication. If AuthScheme is set to authDigest (1), authNtlm (4) or authNegotiate (5), digest, NTLM or Negotiate authentication will be attempted instead.
If AuthScheme is set to authProprietary (2) then the authorization token must be supplied through Authorization property.
If AuthScheme is set to authOAuth (6) then the authorization string must be supplied through Authorization property.
Note that, if you set the Authorization property and AuthScheme is not authProprietary or authOAuth, the AuthScheme will be set automatically to authProprietary (2) by the control.