Returns the principal that was sent to the server during handshaking in the original connection that retrieved the network resource.

Returns:  the principal sent to the server. Returns an X500Principal of the end-entity certificate for X509-based cipher suites, and KerberosPrincipal for Kerberos cipher suites. If no principal was sent, then null is returned.

See also:
getLocalCertificateChain(), getPeerPrincipal()