hsts.md: mention multiple curl invokes effect

Reported-by: zhanhb on github
Ref: #21847
Closes #21851
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Daniel Stenberg 2026-06-02 17:40:48 +02:00
parent 2932b7f56f
commit 5d178de986
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@ -18,7 +18,9 @@ Example:
Enable HSTS for the transfer. If the filename points to an existing HSTS cache
file, that is used. After a completed transfer, the cache is saved to the
filename again if it has been modified.
filename again if it has been modified. If you run multiple curl invokes at
the same time using the same HSTS cache file, they might interfere with each
other in possibly undesired ways.
If curl is told to use `http://` for a transfer involving a hostname that
exists in the HSTS cache, it upgrades the transfer to use HTTPS. Each HSTS