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alpn_protocols 

        # OpenSSL::SSL::SSLContext.alpn_protocols

(from ruby core)
---

An Enumerable of Strings. Each String represents a protocol to be
advertised as the list of supported protocols for Application-Layer
Protocol Negotiation. Supported in OpenSSL 1.0.2 and higher. Has no
effect on the server side. If not set explicitly, the ALPN extension
will not be included in the handshake.

### Example

    ctx.alpn_protocols = ["http/1.1", "spdy/2", "h2"]

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