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suricata/doc/userguide/rules/normalized-buffers.rst

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Normalized Buffers
==================
.. toctree::
http-uri-normalization
A packet consists of raw data. HTTP and reassembly make a copy of
those kinds of packets data. They erase anomalous content, combine
packets etcetera. What remains is a called the 'normalized buffer'.
Example:
.. image:: normalized-buffers/normalization1.png
Because the data is being normalized, it is not what it used to be; it
is an interpretation. Normalized buffers are: all HTTP-keywords,
reassembled streams, TLS-, SSL-, SSH-, FTP- and dcerpc-buffers.