1--- 2c: Copyright (C) Daniel Stenberg, <[email protected]>, et al. 3SPDX-License-Identifier: curl 4Long: hsts 5Arg: <filename> 6Protocols: HTTPS 7Help: Enable HSTS with this cache file 8Added: 7.74.0 9Category: http 10Multi: append 11See-also: 12 - proto 13Example: 14 - --hsts cache.txt $URL 15--- 16 17# `--hsts` 18 19Enable HSTS for the transfer. If the filename points to an existing HSTS cache 20file, that is used. After a completed transfer, the cache is saved to the 21filename again if it has been modified. 22 23If curl is told to use HTTP:// for a transfer involving a hostname that exists 24in the HSTS cache, it upgrades the transfer to use HTTPS. Each HSTS cache 25entry has an individual life time after which the upgrade is no longer 26performed. 27 28Specify a "" filename (zero length) to avoid loading/saving and make curl just 29handle HSTS in memory. 30 31If this option is used several times, curl loads contents from all the 32files but the last one is used for saving. 33