c: Copyright (C) Daniel Stenberg, <daniel.se>, et al. SPDX-License-Identifier: curl Title: CURLOPT_SSL_ENABLE_NPN Section: 3 Source: libcurl See-also:
CURLOPT_SSL_ENABLE_NPN - use NPN
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);
Deprecated in 7.86.0. Setting this option has no function.
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.
1, enabled
HTTP
int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_SSL_ENABLE_NPN, 1L); res = curl_easy_perform(curl); curl_easy_cleanup(curl); } }
Added in 7.36.0. Deprecated in 7.86.0.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.