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npn_protocols 

        # OpenSSL::SSL::SSLContext.npn_protocols

(from ruby core)
---

An Enumerable of Strings. Each String represents a protocol to be
advertised as the list of supported protocols for Next Protocol
Negotiation. Supported in OpenSSL 1.0.1 and higher. Has no effect on the
client side. If not set explicitly, the NPN extension will not be sent
by the server in the handshake.

### Example

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

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