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                     23: .TH CURLOPT_SSL_ENABLE_NPN 3 "May 31, 2017" "libcurl 7.70.0" "curl_easy_setopt options"
                     24: 
                     25: .SH NAME
                     26: CURLOPT_SSL_ENABLE_NPN \- enable NPN
                     27: .SH SYNOPSIS
                     28: #include <curl/curl.h>
                     29: 
                     30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);
                     31: .SH DESCRIPTION
                     32: Pass a long as parameter, 0 or 1 where 1 is for enable and 0 for disable. This
                     33: option enables/disables NPN in the SSL handshake (if the SSL backend libcurl
                     34: is built to use supports it), which can be used to negotiate http2.
                     35: .SH DEFAULT
                     36: 1, enabled
                     37: .SH PROTOCOLS
                     38: HTTP
                     39: .SH EXAMPLE
                     40: .nf
                     41: CURL *curl = curl_easy_init();
                     42: if(curl) {
                     43:   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
                     44:   curl_easy_setopt(curl, CURLOPT_SSL_ENABLE_NPN, 1L);
                     45:   ret = curl_easy_perform(curl);
                     46:   curl_easy_cleanup(curl);
                     47: }
                     48: .fi
                     49: .SH AVAILABILITY
                     50: Added in 7.36.0
                     51: .SH RETURN VALUE
                     52: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
                     53: .SH "SEE ALSO"
                     54: .BR CURLOPT_SSL_ENABLE_ALPN "(3), " CURLOPT_SSL_OPTIONS "(3), "