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From Scott Beardsley <>
Subject Re: header_rewrite to modify destination port based on request header
Date Wed, 07 Oct 2015 23:27:41 GMT
Thanks Jeremy, we we hoping to use an existing/stable plugin to do this (lua appears to be
"experimental" and we don't use it anywhere at the moment). It seems like header_rewrite is
99% of the way there so if it means adding this one feature we'd prefer that since it wouldn't
involve new config syntax and/or plugins. 

     On Wednesday, October 7, 2015 1:41 PM, Jeremy Payne <> wrote:

 Not sure if you are just researching or what.. But this same functionality is also supported
in the lua plugin.


On Wed, Oct 7, 2015 at 12:41 PM, Scott Beardsley <> wrote:

I'd like to modify the destination port based on an incoming request header. It seems like
everything I need is available in the header_rewrite plugin except the value expansion in
the "set-destination port" directive. In the docs it says that this expansion only works for
Is there a way to do something like the following via the existing plugin, maybe my syntax
is wrong? 
cond %{READ_REQUEST_HDR_HOOK} [AND]cond %{CLIENT-HEADER:NEW-PORT} /^[1-9][0-9]*$/set-destination
When I test it I get this debug message: "Would set destination PORT to an invalid range,
Which points me at this code[2]. It looks like the _value variable is set to the string "%{CLIENT-HEADER:NEW-PORT}"
so I guess there is no expansion...
Assuming header_rewrite doesn't support this yet, are there any objections to adding this

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