CURLOPT_SSL_ENABLE_ALPN(3) curl_easy_setopt options CURLOPT_SSL_ENABLE_ALPN(3)
NAME
CURLOPT_SSL_ENABLE_ALPN - Application Layer Protocol Negotiation
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 dis-
able. 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 7.81.0 November 26, 2021 CURLOPT_SSL_ENABLE_ALPN(3)
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