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CURLOPT_SSL_ENABLE_NPN(3)           libcurl          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 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

       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. Deprecated in 7.86.0.


RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.


SEE ALSO

       CURLOPT_SSL_ENABLE_ALPN(3), CURLOPT_SSL_OPTIONS(3),

ibcurl 8.1.2                    April 26, 2023       CURLOPT_SSL_ENABLE_NPN(3)

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