CURLOPT_SSL_ENABLE_ALPN(3)

CURLOPT_SSL_ENABLE_ALPN(3curl_easy_setopt optionCURLOPT_SSL_ENABLE_ALPN(3)

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  sup-
     ports it), which can be used to negotiate http2.

DEFAULT

     1, enabled

PROTOCOLS

     HTTP

EXAMPLE

     CURL *curl = curl_easy_init();
     if(curl) {
       curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
       curl_easy_setopt(curl, CURLOPT_SSL_ENABLE_ALPN, 0L);
       ret = curl_easy_perform(curl);
       curl_easy_cleanup(curl);
     }

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(3), CURLOPT_SSL_OPTIONS(3),

libcurl 7.58.0      Last change: May 31, 2017                   1