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40 lines
1.3 KiB
Markdown
40 lines
1.3 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Long: hsts
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Arg: <filename>
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Protocols: HTTPS
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Help: Enable HSTS with this cache file
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Added: 7.74.0
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Category: http
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Multi: append
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See-also:
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- proto
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Example:
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- --hsts cache.txt $URL
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---
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# `--hsts`
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Enable HSTS for the transfer. If the filename points to an existing HSTS cache
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file, that is used. After a completed transfer, the cache is saved to the
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filename again if it has been modified. If you run multiple curl invokes at
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the same time using the same HSTS cache file, they might interfere with each
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other in possibly undesired ways.
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If curl is told to use `http://` for a transfer involving a hostname that
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exists in the HSTS cache, it upgrades the transfer to use HTTPS. Each HSTS
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cache entry has an individual lifetime after which the upgrade is no longer
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performed.
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Specify a "" filename (zero length) to avoid loading/saving and make curl
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handle HSTS in memory.
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You may want to restrict your umask to prevent other users on the same system
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to access the created file.
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If this option is used several times, curl loads contents from all the
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files but the last one is used for saving.
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Since curl 8.20.0, curl keeps no more than the most recently added 10,000
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unique HSTS hostnames.
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