bneradt commented on code in PR #12822:
URL: https://github.com/apache/trafficserver/pull/12822#discussion_r2723454264
##########
doc/admin-guide/plugins/header_rewrite.en.rst:
##########
@@ -1529,6 +1529,15 @@ The URL part names which may be used for these
conditions and actions are:
parameters, until the end of the URL. Empty string if there were
no
query parameters. ``Value`` = `p=hrw&v=1`
+ A specific query parameter value can be extracted using the
sub-key
+ syntax ``QUERY:<param_name>``. For example,
``%{CLIENT-URL:QUERY:p}``
+ would return ``hrw`` for the URL above.
+
+ .. note::
+ Query parameter names and values are matched as-is without URL
+ decoding. For example, ``%{CLIENT-URL:QUERY:my%20param}``
matches
+ the literal parameter name ``my%20param``, not ``my param``.
Review Comment:
Maybe add a note that if there are duplicate names, the first value listed
wins.
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