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c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Long: hsts Arg: Protocols: HTTPS Help: Enable HSTS with this cache file Added: 7.74.0 Category: http Multi: append See-also:

  • proto Example:
  • --hsts cache.txt $URL ---

--hsts

This option enables HSTS for the transfer. If the file name points to an existing HSTS cache file, that is used. After a completed transfer, the cache is saved to the file name again if it has been modified.

If curl is told to use HTTP:// for a transfer involving a host name that exists in the HSTS cache, it upgrades the transfer to use HTTPS. Each HSTS cache entry has an individual life time after which the upgrade is no longer performed.

Specify a "" file name (zero length) to avoid loading/saving and make curl just handle HSTS in memory.

If this option is used several times, curl loads contents from all the files but the last one is used for saving.