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Apache Traffic Server Header Filter plugin
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==========================================
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This is a simple plugin for filtering out headers from requests (or
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responses). Typical configuration is done either with a global
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configuration, in .../etc/trafficserver/plugin.config:
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header_filter.so /usr/local/etc/hdr_filters.conf
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Or, alternatively, in a per-remap rule configuration
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map http://a.com/ http://b.com @plugin=header_filter.so @pparam=hdr_filters.conf
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Even if you don't have a global configuration, if your remap rules
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schedules actions in hooks other than during remap, you must also add the
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header_filter.so to the plugin.config (see above), but without args:
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The configuration files looks like
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X-Fie "Test" # Match the entire string
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X-Foo /Test/ # Match the (Perl) regex
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X-Bar [Test* # Match the prefix string
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X-Fum *Test] # Match the postfix string
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Comments are prefixed with #, and in most cases, the regular expression
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matching is the best choice (very little overhead). The pattern matches
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can also take an option '!' to reverse the test. The default action is
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to delete all headers that do (not) match the pattern. E.g.
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The final "i" qualifier (works on all pattern matches) forces the match or
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comparison to be made case insensitive (just like in Perl).
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It's also possible to replace or add headers, using the = and +
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operators. For example
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Host =www.example.com=
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This will force the Host: header to have exactly one value,
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www.example.com, while X-Foo will have at least one header with the value
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ATS, but there could be more instances of the header from the existing
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header in the request.
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If not specified, the default hook to add the rules (headers to filter) is
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READ_REQUEST_HDR. It's completely acceptable (and useful) to configure a
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remap rule to delete headers in a later hook (e.g. when reading a response
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from the server). This is what actually makes the plugin even remotely
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should do it, assuming that you have the tsxs script in your search
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path. This script is installed with your installation of Apache Traffic
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plugins/header_filter/README
