1CURLOPT_SSL_ENABLE_NPN(3) libcurl CURLOPT_SSL_ENABLE_NPN(3)
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6 CURLOPT_SSL_ENABLE_NPN - use NPN
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9 #include <curl/curl.h>
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11 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);
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14 Deprecated in 7.86.0. Setting this option has no function.
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16 Pass a long as parameter, 0 or 1 where 1 is for enable and 0 for dis‐
17 able. This option enables/disables NPN in the SSL handshake (if the SSL
18 backend libcurl is built to use supports it), which can be used to ne‐
19 gotiate http2.
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22 1, enabled
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25 HTTP
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28 CURL *curl = curl_easy_init();
29 if(curl) {
30 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
31 curl_easy_setopt(curl, CURLOPT_SSL_ENABLE_NPN, 1L);
32 ret = curl_easy_perform(curl);
33 curl_easy_cleanup(curl);
34 }
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37 Added in 7.36.0. Deprecated in 7.86.0.
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40 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
41 if not.
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44 CURLOPT_SSL_ENABLE_ALPN(3), CURLOPT_SSL_OPTIONS(3),
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48ibcurl 8.2.1 April 26, 2023 CURLOPT_SSL_ENABLE_NPN(3)