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CURLOPT_SSL_ENABLE_ALPN(3)                            curl_easy_setopt options


NAME

       CURLOPT_SSL_ENABLE_ALPN - Application Layer Protocol Negotiation


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),

libcurl 7.83.1                 November 26, 2021    CURLOPT_SSL_ENABLE_ALPN(3)

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