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  1. JDK
  2. JDK-8171443

(spec) An ALPN callback function may also ignore ALPN

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        TLS supports an ALPN callback function which enables ALPN parameters to be supplied during the TLS handshake.

        See SSLEngine.setHandshakeApplicationProtocolSelector
        and SSLSocket.setHandshakeApplicationProtocolSelector

        The ALPN callback function is currently specified to return one of two values:
            o an application protocol name
            o null -- no acceptable protocol name

        It should be specified that the callback function can also return:
            o an empty string -- to ignore ALPN

              vinnie Vincent Ryan
              vinnie Vincent Ryan
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