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theseion merged 1 commit into from
Nov 20, 2025
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docs: comment on disabling Expect header in .Net #4348

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6 changes: 5 additions & 1 deletion crs-setup.conf.example
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Expand Up @@ -617,7 +617,11 @@ SecDefaultAction "phase:2,log,auditlog,pass"
#
# /expect/
# Blocking this header prevents Expect-based desync attacks
# https://portswigger.net/research/http1-must-die#expect-based-desync-attacks
# https://portswigger.net/research/http1-must-die#expect-based-desync-attacks.
#
# The `System.Net.HttpWebRequest` library in .Net uses this header. Use of the header
# can be disabled by setting `ServicePointManager.Expect100Continue` to `false`
# (see https://learn.microsoft.com/en-us/dotnet/api/system.net.servicepointmanager.expect100continue?view=net-10.0).
#
# Uncomment this rule to change the default.
#SecAction \
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