## NAME

CURLOPT_SSL_ENABLE_ALPN - enable ALPN

## SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_ALPN, long npn);

## DESCRIPTION

Pass a long as parameter, 0 or 1 where 1 is for enable and 0 for disable. This option enables/disables ALPN in the SSL handshake (if the SSL backend libcurl is built to use supports it), which can be used to negotiate http2.

## DEFAULT

1, enabled

## PROTOCOLS

HTTP

## EXAMPLE

TODO

## AVAILABILITY

Added in 7.36.0

## RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

## SEE ALSO

CURLOPT_SSL_ENABLE_NPN CURLOPT_SSL_OPTIONS

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