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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)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | DEPRECATED | AVAILABILITY | RETURN VALUE | SEE ALSO
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