curl-w32/docs/libcurl/opts/CURLOPT_SSL_ENABLE_NPN.md

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---
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_ALPN (3)
- CURLOPT_SSL_OPTIONS (3)
---
# NAME
CURLOPT_SSL_ENABLE_NPN - use NPN
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);
~~~
# DESCRIPTION
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.
# DEFAULT
1, enabled
# PROTOCOLS
HTTP
# EXAMPLE
~~~c
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);
}
}
~~~
# AVAILABILITY
Added in 7.36.0. Deprecated in 7.86.0.
# RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.