CURLOPT_SSL_ENABLE_ALPN

Section: curl_easy_setopt options (3)
Updated: May 31, 2017
Index Return to Main Contents

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NAME

CURLOPT_SSL_ENABLE_ALPN - enable ALPN  

SYNOPSIS

#include <curl/curl.h>

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

DESCRIPTION

Pass a long as parameter, 0 or 1 where 1 is for enable and 0 for disable. This option enables/disables ALPN 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_ALPN, 0L);
  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_NPN(3), CURLOPT_SSL_OPTIONS(3),

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Index

NAME

SYNOPSIS

DESCRIPTION

DEFAULT

PROTOCOLS

EXAMPLE

AVAILABILITY

RETURN VALUE

SEE ALSO