table of contents
CURLOPT_SSL_ENABLE_NPN(3) | curl_easy_setopt options | CURLOPT_SSL_ENABLE_NPN(3) |
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¶
November 4, 2020 | libcurl 7.76.1 |