Hi,
sorry for the crosspost, but I am not sure where to ask. I am trying to
understand a weird problem accessing HTTP request headers from a jsf page.
The setup is as follows:
apache1 -> apache2 -> mod_jk -> tomcat
Apache1 is accessible from the Internet and forwards requests to my application
to apache2. I have no direct control over the setup of apache1 and I cannot
look
at the configuration. Apache2 (2.0.63 on Linux) is answering requests from the
intranet and forwards them via mod_jk (1.2.30) to two loadbanced tomcats
(Linux,
6.0.32).
Apache1 inserts the following variables into the requests it forwards to
Apache1. Apache1 can see them, I have checked that using cgi-bin/printenv (some
values anonymized):
HTTP_X_FORWARDED_FOR="aa.bb.cc.dd"
HTTP_X_FORWARDED_HOST="xxx.yyy.net"
HTTP_X_FORWARDED_PORT="443"
HTTP_X_FORWARDED_PROTOCOL="https"
HTTP_X_FORWARDED_SERVER="aaa.bbb.ccc"
If I try to read those variables from the tomcat application using this
facelett code:
<h:outputText style="font: bold 14px sans-serif;"
value="X_FORWARDED_HOST: #{header['X_FORWARDED_HOST']}" />
<br />
<h:outputText style="font: bold 14px sans-serif;"
value="X_FORWARDED_PROTOCOL: #{header['X_FORWARDED_PROTOCOL']}"
/>
<br />
<h:outputText style="font: bold 14px sans-serif;"
value="X_FORWARDED_PORT: #{header['X_FORWARDED_PORT']}" />
<br />
<h:outputText style="font: bold 14px sans-serif;"
value="X_FORWARDED_FOR: #{header['X_FORWARDED_FOR']}" />
<br />
<h:outputText style="font: bold 14px sans-serif;"
value="X_FORWARDED_SERVER: #{header['X_FORWARDED_SERVER']}" />
<br />
Only X_FORWARDED_PORT and X_FORWARDED_PROTOCOL are set. The other three are
empty/null. It seem that somewhere they get dropped between Apache2, mod_jk and
Tomcat.
Now, I know that _PORT and _PROTOCOL are inserted at Apache1 using
'RequestHeader set X_FORWARDED_PROTOCOL "https"', while I do not know how the
other three are generated. If I add 'RequestHeader set X_FORWARDED_HOST
"xxx.yyy.net"' to the configuration from apache2, the application sees that
header as well. Confused? so am I :-(
Happy weekend
Martin
------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www: http://www.knobisoft.de
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