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CURLOPT_SSL_ENABLE_ALPN(3) curl_easy_setopt options
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
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 7.73.0 May 31, 2017 CURLOPT_SSL_ENABLE_ALPN(3)