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Add "no OPENSSL_Applink" warning when SSLKEYLOGFILE is set on win32 #1059

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Add "no OPENSSL_Applink" warning when SSLKEYLOGFILE is set on win32 #1059

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17 changes: 17 additions & 0 deletions httpcore/_backends/__init__.py
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import os
import sys
import warnings

# [Windows Only] SSLKEYLOGFILE can trigger the "no OPENSSL_Applink" error.
# OpenSSL on Windows requires an 'Applink' interface to safely perform I/O
# (like logging keys) across different C-Runtimes (CRT). Since CPython doesn't
# provide this bridge and manages I/O independently, OpenSSL fails to access
# Windows stdio, leading to a crash or the "no OPENSSL_Applink" error.
if os.environ.get("SSLKEYLOGFILE") and sys.platform == "win32":
warnings.warn(
"Detected SSLKEYLOGFILE environment variable, which may cause "
"'no OPENSSL_Applink' errors. If you encounter this issue, try "
"unsetting or removing the variable temporarily.",
UserWarning,
2,
)
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