CURLOPT_SSL_ENABLE_NPN
Section: curl_easy_setopt options (3)
Updated: November 04, 2020
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NAME
CURLOPT_SSL_ENABLE_NPN - enable NPN
SYNOPSIS
#include <
curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);
DESCRIPTION
Pass a long as parameter, 0 or 1 where 1 is for enable and 0 for disable. This
option enables/disables NPN 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_NPN, 1L);
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_ALPN(3),
CURLOPT_SSL_OPTIONS(3),