CURLOPT_SSL_ENABLE_ALPN explained
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
Protocols
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
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),
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