1CURLOPT_ALTSVC(3) curl_easy_setopt options CURLOPT_ALTSVC(3)
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6 CURLOPT_ALTSVC - set alt-svc cache file name
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9 #include <curl/curl.h>
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11 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ALTSVC, char *filename);
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14 Warning: this feature is early code and is marked as experimental. It
15 can only be enabled by explicitly telling configure with --enable-alt-
16 svc. You are advised to not ship this in production before the experi‐
17 mental label is removed.
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20 Pass in a pointer to a filename to instruct libcurl to use that file as
21 the Alt-Svc cache to read existing cache contents from and possibly
22 also write it back to a after a transfer, unless CURLALTSVC_READONLY‐
23 FILE is set in CURLOPT_ALTSVC_CTRL(3).
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25 Specify a blank file name ("") to make libcurl not load from a file at
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29 NULL. The alt-svc cache is not read nor written to file.
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32 HTTPS
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35 CURL *curl = curl_easy_init();
36 if(curl) {
37 curl_easy_setopt(curl, CURLOPT_ALTSVC_CTRL, CURLALTSVC_H1);
38 curl_easy_setopt(curl, CURLOPT_ALTSVC, "altsvc-cache.txt");
39 curl_easy_perform(curl);
40 }
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43 Added in 7.64.1
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46 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
47 if not.
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50 CURLOPT_ALTSVC_CTRL(3), CURLOPT_CONNECT_TO(3), CURLOPT_RESOLVE(3), CUR‐
51 LOPT_COOKIEFILE(3),
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55libcurl 7.66.0 August 14, 2019 CURLOPT_ALTSVC(3)