Just discovered the solution which is use DEFLATE on incoming requests to INFLATE the content. Weird, but that's how it is mapped out in mod_deflate.c.
I guess the thinking is that you wouldn't ever zip content which has already made it across the wire to your server.
Zach Calvert
-----Original Message-----
From: Calvert, Zach (Zach)** CTR ** [mailto:zcalvert@xxxxxxxxxx]
Sent: Tuesday, October 23, 2012 2:21 PM
To: 'users@xxxxxxxxxxxxxxxx'
Subject: mod_deflate - INFLATE filter problem
I am trying to configure an apache reverse proxy serving SSL where it will inflate gzip posts and then deflate (gzip) the response on the way back out. I have all SSL, reverse proxy configuration working. I've tested and verified those pieces. What I'm trying to do now is enable mod_deflate to do the unpacking of the requests and the re-packing of the response. This is simply to minimize bandwidth usage. I have verified the client is submitting gzip data and also sending the HTTP Header "Content-Encoding" as "gzip" (not quite sure if that matters at this point). The data being proxied is not being upackaged (deflated), and in the httpd error logs, I see [Tue Oct 23 14:02:24 2012] [error] an unknown filter was not added: INFLATE
I have found the configuration docs for this at http://httpd.apache.org/docs/2.2/mod/mod_deflate.html
and some various other emails complaining of this problem turned up via google, with no real answer emails.
I have tried various configurations in my VirtualHost with/without Location of http_bind. I also cannot find the input filter by type directive similar to "AddOutputFilterByType". I would have expected there is a AddInputFilterByType, but there is not one.
Note that I also have
LoadModule deflate_module modules/mod_deflate.so so it isn't something as simple as "you forgot to load the module".
Sample configuration:
<VirtualHost _default_:5555>
ServerName test.com:5555
ErrorLog logs/test.com-error.log
CustomLog logs/test.com-access.log common
SSLEngine on
SSLCipherSuite ALL:!ADH:+HIGH:-MEDIUM:-LOW:-SSLv2:-EXP
SSLCertificateFile /var/www/keys/test.com.crt
SSLCertificateKeyFile /var/www/keys/test.com.key
SSLCertificateChainFile /var/www/keys/RapidSSL_CA_bundle.pem
SetInputFilter INFLATE
SetOutputFilter DEFLATE
SSLProxyEngine On
ProxyRequests Off
ProxyPreserveHost On
<Location /http_bind>
SetInputFilter INFLATE
SetOutputFilter DEFLATE
ProxyPass https://test.com:5443/http_bind
ProxyPassReverse https://test.com:5443/http_bind
</Location>
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
</VirtualHost>
Again, the only log that I can find that indicates the problem is [Tue Oct 23 14:02:24 2012] [error] an unknown filter was not added: INFLATE
Is there some other directive that I may be missing to unpack the posted gzip requests?
Thank you,
Zach Calvert
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