61 lines
1.1 KiB
Markdown
61 lines
1.1 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_SSL_ENABLE_ALPN
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_SSL_ENABLE_NPN (3)
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- CURLOPT_SSL_OPTIONS (3)
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---
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# NAME
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CURLOPT_SSL_ENABLE_ALPN - Application Layer Protocol Negotiation
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_ENABLE_ALPN, long npn);
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~~~
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# DESCRIPTION
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Pass a long as parameter, 0 or 1 where 1 is for enable and 0 for disable. This
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option enables/disables ALPN in the SSL handshake (if the SSL backend libcurl
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is built to use supports it), which can be used to negotiate http2.
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# DEFAULT
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1, enabled
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# PROTOCOLS
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HTTP
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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curl_easy_setopt(curl, CURLOPT_SSL_ENABLE_ALPN, 0L);
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.36.0
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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