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From Mohit Anchlia <mohitanch...@gmail.com>
Subject Re: [users@httpd] Filter or Handler to look at content length and return custom error message suggestion
Date Thu, 18 Nov 2010 01:56:14 GMT
On Wed, Nov 17, 2010 at 4:50 PM, Eric Covener <covener@gmail.com> wrote:
> On Wed, Nov 17, 2010 at 5:58 PM, Mohit Anchlia <mohitanchlia@gmail.com> wrote:
>> Apache 2:
>>
>> I have a requirement to look at content length and if it is greatar
>> than desired size then return error message. So psuedo code is like:
>>
>> if content_length > 32G
>> then
>>   if url contains /abc/
>>   then
>>       echo "0|abc|Bad length" # pipe delimited format that some
>> clients api support
>>   else if url contains /def/
>>       echo "<xml><message>Bad request</message><xml>"
# client supporting XML
>>   fi
>> fi
>>
>> I first thought of using LimitRequestBody but that didn't work for me.
>> So now I am thinking if I can use filter or handlers. Does anyone know
>> if I can use filters that is read the lenght and the url and then
>> return the response instead of continuing down the chain.
>>
>> P.S. Note: Our requests are mod-jk requests. So if content length
>> check succeeds then hand over the request to mod jk workers wihch then
>> send it to jboss app server.
>>
>
> If you know this stuff is not chunked, you can do a simpler
> post_read_request hook and return 413 from it.

I haven't used handlers or filters before in Apache. Searching online
I see I can make use of "PerlPostReadRequestHandler" and may be read
the content length. But I have few more quesitons:

1. After the request is read and if I find content length > x then how
do I create the response and return from there without sending the
request to mod-jk worker
2. If I find content length is ok and want to continue sending the
request to mod_jk worker then how do I do that.
3. In the handler can I also generate custom response text?

>
> If it might be chunked, it should be relatively easy to rip the guts
> out something like mod_deflate's input filter and teach it to count
> bytes / return an error.
>
> --
> Eric Covener
> covener@gmail.com
>
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