On Wed, Nov 17, 2010 at 5:56 PM, Mohit Anchlia <mohitanchlia@xxxxxxxxx> wrote:
> On Wed, Nov 17, 2010 at 4:50 PM, Eric Covener <covener@xxxxxxxxx> wrote:
>> On Wed, Nov 17, 2010 at 5:58 PM, Mohit Anchlia <mohitanchlia@xxxxxxxxx> 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?
I tried to write code but still unsure of few thing:
1. If I return HTTP_REQUEST_ENTITY_TOO_LARGE response then would it
still continue sending the request to mod_jk. Or would it be returned
back to the client?
2. Does my code look ok and something that will work? Can someone
please suggest?
This is my code
sub content_handler {
my $r = shift;
my $uri = $r->uri;
if ( $r->header_in("Content-length") lt 20000000) {
return Apache2::Const::OK; # Continue sending request to mod jk worker
}
$r->send_http_header;
if ($uri =~ /xml/){
$r->content_type("text/xml");
$r->print("File too large|Bye"); #Send pipe delimited back to
client assuming it will not continue sending this request to mod_jk
worker
}else{
$r->content_type("text/plain");
$r->print ("<xml><Message>Too Large, Bye!!</Message></xml>");
#Send xml delimited back to client assuming it will not continue
sending this request to mod_jk worker
}
return Apache2::Const::HTTP_REQUEST_ENTITY_TOO_LARGE; # Return back to client
}
>
>>
>> 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@xxxxxxxxx
>>
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