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Date: Mon, 15 Mar 2010 13:29:46 +0000
Message-ID: <2fb267f81003150629o3158304dld3977e7908a54c79@mail.gmail.com>
From: Anurag Kapur <anuragkapur@gmail.com>
To: users@httpd.apache.org
Content-Type: text/plain; charset=ISO-8859-1
Subject: [users@httpd] Re: Conditionally Setting HTTP Response Header

Thanks Balj.

Unfortunately using a servlet filter will not serve my purpose. In my
system, some requests are proxied from HTTPD to Tomcat while others
are served directly by HTTPD. Thus, I am looking for something in the
HTTPD layer that can check if the header is already set and then take
action accordingly.

I am quite sure SetEnvIf directive in conjunction with Header set
directive can work here. However, I have not managed to get it working
after quite a few tries. Thus I am polling this group to know if
someone has already implemented somthing similar.

Regards


On 3/15/10, Baljeet Nijjhar <baljeet.nijjhar@googlemail.com> wrote:
> Hi Anurag
> I have had the exact same problem and posted in
> http://www.gossamer-threads.com/lists/apache/users/382031?page=last
> You can use ExpiresDefault/ExpiresByType (this adds both an Expires and
> Cache-Control: max-age header to simultaneously support HTTP 1.0 and HTTP
> 1.1) or use LocationMatch. For example, I could distinguish between static
> content requests (requests to *.gif) vs dynamic content requests
> (requests to *.jsp or *.do for a Struts application) using the
> LocationMatch. I couldn't find a way of using LocationMatch to work with the
> content-type of the response, which was what I needed for file download
> requests. Nor could I find a way of checking whether the header was set,
> before setting it. (I'm still asking the question).
> In the end, I have set the values using e.g. servlet filters in my
> application code.
> thanks, Balj.
>
> On Mon, Mar 15, 2010 at 12:50 PM, Anurag Kapur <anuragkapur@gmail.com>wrote:
>
>> Hello,
>>
>> I am looking for some help to set HTTP response headers conditionally. I
>> have a setup where HTTPD sits in front of Tomcat and proxies requests to
>> it.
>>
>> *Problem Statement*
>> Set a Cache-Control max-age directive in the HTTP response header through
>> HTTPD if it doesn't already exist. In addition if HTTPD after detecting
>> that
>> the directive is not already set in the response header, it should set one
>> depending on the response mime-type.
>>
>> Example:
>> HTTPD proxies a request to tomcat -> Tomcat processes the request and send
>> back the response to HTTPD -> HTTPD checks if Cache-Control max-age
>> directive is set in the response header. If present it does no changes to
>> the response header and simply forwards the response back to the user.
>> However, if the Cache-Control max-age directive is not present it sets one
>> depending on the response mime type (say max-age=900 for text/html and
>> max-age=1800 for image/gif)
>> *
>> *
>> *System Info*
>>  $ apachectl -version
>>  Server version: Apache/2.2.9 (Unix)
>>   Server built:   Sep 12 2008 16:23:39
>>
>>   $ uname -a
>> SunOS vm-sol10-45 5.10 Generic_127128-11 i86pc i386 i86p
>>
>> *What I Have Tried*
>> I have been trying to work with mod_setenvif module to start but have not
>> made any progress and thus seeking your help.
>>
>> Any inputs would be highly appreciated.
>>
>> Regards
>> Anurag
>> *
>> *------------------------------------------------------------------
>> Anurag Kapur
>> Associate - Technology,
>> Sapient Corporation.
>>
>> http://www.linkedin.com/in/anuragkapur
>>
>> http://www.google.com/profiles/anuragkapur
>> ------------------------------------------------------------------
>>
>

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Anurag Kapur
Associate - Technology,
Sapient Corporation.

+44 (0) 7514 996 586

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