CURLOPT_SSL_ENABLE_NPN - Online Linux Manual PageSection : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options
NAMECURLOPT_SSL_ENABLE_NPN − use NPN
SYNOPSIS#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);
DESCRIPTIONPass 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.
DEFAULT1, enabled
PROTOCOLSHTTP
EXAMPLECURL *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);
}
AVAILABILITYAdded in 7.36.0
RETURN VALUEReturns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
SEE ALSOCURLOPT_SSL_ENABLE_ALPN(3), CURLOPT_SSL_OPTIONS (3)," 0
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