Topic: Header append Vary User-Agent env=!dont-vary ?

[krishna.rgm]

Hi All,

In one of our application, we have the following entries in httpd.conf
===============================
<IfModule mod_headers.c>
# Make sure proxies don.t deliver the wrong content
Header append Vary User-Agent env=!dont-vary
</IfModule>
===============================

Requesting to kindly confirm following

1. What is the importance of above parameters
1. Above mentioned entries by default present in httpd.conf or not.
2. If this entry is disabled through hashing it out, what would be its impact on application.

Thanks
Krishna

[Steffen]

See for details:

http://httpd.apache.org/docs/2.4/mod/mod_deflate.html#proxies

When compressed/deflate then this header is send:

Vary => User-Agent,Accept-Encoding

When not compressed (e.g. gif, see http://httpd.apache.org/docs/2.4/mod/mod_deflate.html#recommended ) then the header:

Vary => User-Agent

Not standard, only needed/advised when Deflate is set to on.

[krishna.rgm]

Thanks for the information.

So As per you words, below parameters were not present by default in Apache. Correct me, if Iam wrong
"Header append Vary User-Agent env=!dont-vary"

Thanks
Krishna

[Steffen]

Look for the default/original config files in: ...\conf\original

[krishna.rgm]

I have checked in default and original httpd.conf. There was no entry of the parameters which I have mentioned. And by default headers_module has disabled even deflate module also. Now I understand that we have to manually configure the headers and deflate module in Apache.
Thank you very much Steffen for your kind support in getting the above information.


Thanks
Steffen