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SSL key logging (aka SSLKEYLOGFILE)

SSL key logging is a feature that browsers export TLS keys into a text file, which can be used by Wireshark to decrypt TLS traffic. This feature can be enabled on Firefox and Chrome by setting SSLKEYLOGFILE environment variable, which is a path to the log file.

This feature is useful for debugging network error and for learning structures of TLS-encrypted application layer protocols (such as encrypted HTTP/2) with Wireshark.

See also:
[1] https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Key_Log_Format
[2] https://wiki.wireshark.org/SSL#Using_the_.28Pre.29-Master-Secret

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