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CURLOPT_SSL_ENABLE_NPN(3)  Library Functions Manual  CURLOPT_SSL_ENABLE_NPN(3)

NAME
       CURLOPT_SSL_ENABLE_NPN -	use NPN

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);

DESCRIPTION
       Deprecated since	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 dis-
       able. 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  ne-
       gotiate http2.

DEFAULT
       1, enabled

PROTOCOLS
       This functionality affects all TLS based	protocols: HTTPS, FTPS,	IMAPS,
       POP3S, SMTPS etc.

       All TLS backends	support	this option.

EXAMPLE
       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);
	 }
       }

DEPRECATED
       Deprecated since	7.86.0

AVAILABILITY
       Added in	curl 7.36.0

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_SSL_ENABLE_ALPN(3), CURLOPT_SSL_OPTIONS(3)

libcurl				  2025-06-03	     CURLOPT_SSL_ENABLE_NPN(3)

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