1CURLOPT_HSTS(3) curl_easy_setopt options CURLOPT_HSTS(3)
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6 CURLOPT_HSTS - HSTS cache file name
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9 #include <curl/curl.h>
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11 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTS, char *filename);
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14 Make the filename point to a file name to load an existing HSTS cache
15 from, and to store the cache in when the easy handle is closed. Setting
16 a file name with this option will also enable HSTS for this handle (the
17 equivalent of setting CURLHSTS_ENABLE with CURLOPT_HSTS_CTRL(3)).
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19 If the given file does not exist or contains no HSTS entries at
20 startup, the HSTS cache will simply start empty. Setting the file name
21 to NULL or "" will only enable HSTS without reading from or writing to
22 any file.
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24 If this option is set multiple times, libcurl will load cache entries
25 from each given file but will only store the last used name for later
26 writing.
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29 The HSTS cache is saved to and loaded from a text file with one entry
30 per physical line. Each line in the file has the following format:
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32 [host] [stamp]
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34 [host] is the domain name for the entry and the name is dot-prefixed if
35 it is a includeSubDomain entry (if the entry is valid for all subdmains
36 to the name as well or only for the exact name).
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38 [stamp] is the time (in UTC) when the entry expires and it uses the
39 format "YYYYMMDD HH:MM:SS".
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41 Lines starting with "#" are treated as comments and are ignored. There
42 is currently no length or size limit.
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45 NULL, no file name
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48 HTTPS and HTTP
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51 CURL *curl = curl_easy_init();
52 if(curl) {
53 curl_easy_setopt(curl, CURLOPT_HSTS, "/home/user/.hsts-cache");
54 curl_easy_perform(curl);
55 }
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58 Added in 7.74.0
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61 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
62 if not.
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65 CURLOPT_HSTS_CTRL(3), CURLOPT_ALTSVC(3), CURLOPT_RESOLVE(3),
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69libcurl 7.85.0 May 17, 2022 CURLOPT_HSTS(3)