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deps/curl/docs/libcurl/opts/CURLOPT_SSL_ENABLE_NPN.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SSL_ENABLE_NPN
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_SSL_ENABLE_ALPN (3)
+  - CURLOPT_SSL_OPTIONS (3)
+---
+
+# NAME
+
+CURLOPT_SSL_ENABLE_NPN - use NPN
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_NPN, long npn);
+~~~
+
+# DESCRIPTION
+
+Deprecated in 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 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.
+
+# DEFAULT
+
+1, enabled
+
+# PROTOCOLS
+
+HTTP
+
+# EXAMPLE
+
+~~~c
+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);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.36.0. Deprecated in 7.86.0.
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.