[#SSL_get0_next_proto_negotiated]
= SSL_get0_next_proto_negotiated
:mrdocs:

Return the Next Protocol Negotiation (NPN) protocol selected on this connection.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_get0_next_proto_negotiated(
    xref:SSL.adoc[SSL] const* s,
    unsigned char const** data,
    unsigned int* len);
----

== Description

NPN is obsolete relative to ALPN and cannot be used with QUIC SSL objects.

== Return Value

the Next Protocol Negotiation (NPN) protocol selected on this connection.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| SSL connection that completed NPN during the handshake.
| *data*
| Receives a pointer to the protocol name (not NUL‐terminated), or NULL if none was negotiated.
| *len*
| Receives the length of the protocol name in bytes, or 0 if `data` is NULL.
|===


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