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Posted to modules-dev@httpd.apache.org by Ivan Prostran <iv...@bulb.hr> on 2012/09/25 13:15:23 UTC
Input filters that alter content-length
Hi,
I have the following scenario :
- Apache/2.2.19 (Solaris 10 SPARC)
SetInputFilter alterxmlbody (AP_FTYPE_RESOURCE)
SetHandler weblogic-handler
The handler forwards requests to multiple weblogic servers
and the filter itself analyzes and/or changes the POST data
in a way that the length of the incoming request may be changed.
The question is :
What is the proper and legitimate way to deal with this situation?
Should the input filter set the new CL value in "headers_in" before
returning from the callback, or just remove it from the list?
apr_off_t length;
apr_brigade_length (bb,1,&length);
apr_table_setn(f->r->headers_in, "Content-Length",
apr_off_t_toa(f->r->pool, length));
Unfortunately, this approach breaks the pipeline because sometimes
the filter needs to buffer data over more than one call, but I do not
consider this as a problem.
or
apr_table_unset(f->r->headers_in, "Content-Length");
Thanks for any help.
Best regards
Ivan
RE: Input filters that alter content-length
Posted by "Mashlum, Samir" <Sa...@adp.com>.
Hi, does anyone knows where I can find an example using apr_crypt API and DES?
Regards,
Sam
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Re: Input filters that alter content-length
Posted by Ivan Prostran <iv...@bulb.hr>.
Hi,
I've found one plausible thread that helped me
to understand what's exactly going on here.
[PATCH] Fix proxy's handling of input bodies
http://www.mail-archive.com/dev@httpd.apache.org/msg14091.html
So, if I'm not wrong, the problemI encountered is
actually related to the proprietary weblogic handler
that, as described in thread, falls if a input filter
changes the content of the original request.
Additional advise on the matter would be appreciated.
I could use mod_proxy, but I don't think
that's possible for the moment :))))
Thanks!
Regards,
Ivan
On 09/26/2012 09:07 PM, Ivan Prostran wrote:
> On 09/25/12 15:28, Ben Noordhuis wrote:
>> On Tue, Sep 25, 2012 at 2:51 PM, Ivan Prostran
<iv...@bulb.hr> wrote:
>>> Do you suggest chunked transfer encoding?
>> Yep. There's nary a proxy problem you can't solve with chunked
encoding.
>
> I'm surprised I haven't managed to find example or relevant
> document/explanation regarding this case.
>
> Perhaps I've missed some basic constraints here.
>
> I wonder if something like this is supported in the first place.
>
> Regards,
> Ivan
Re: Input filters that alter content-length
Posted by Ivan Prostran <iv...@bulb.hr>.
On 09/25/12 15:28, Ben Noordhuis wrote:
> On Tue, Sep 25, 2012 at 2:51 PM, Ivan Prostran <iv...@bulb.hr> wrote:
>> Do you suggest chunked transfer encoding?
> Yep. There's nary a proxy problem you can't solve with chunked encoding.
I'm surprised I haven't managed to find example or relevant
document/explanation regarding this case.
Perhaps I've missed some basic constraints here.
I wonder if something like this is supported in the first place.
Regards,
Ivan
Re: Input filters that alter content-length
Posted by Ivan Prostran <iv...@gmail.com>.
On 09/25/12 15:28, Ben Noordhuis wrote:
> On Tue, Sep 25, 2012 at 2:51 PM, Ivan Prostran<iv...@bulb.hr> wrote:
>> Do you suggest chunked transfer encoding?
> Yep. There's nary a proxy problem you can't solve with chunked encoding.
I'm surprised I haven't managed to find example or relevant
document/explanation regarding this case.
Perhaps I've missed some basic constraints here.
I wonder if something like this is supported in the first place.
Regards,
Ivan
Re: Input filters that alter content-length
Posted by Ben Noordhuis <in...@bnoordhuis.nl>.
On Tue, Sep 25, 2012 at 2:51 PM, Ivan Prostran <iv...@bulb.hr> wrote:
> Do you suggest chunked transfer encoding?
Yep. There's nary a proxy problem you can't solve with chunked encoding.
Re: Input filters that alter content-length
Posted by Ivan Prostran <iv...@bulb.hr>.
On 09/25/12 14:04, Ben Noordhuis wrote:
> On Tue, Sep 25, 2012 at 1:15 PM, Ivan Prostran <iv...@bulb.hr> wrote:
>> Hi,
>>
>> I have the following scenario :
>>
>> - Apache/2.2.19 (Solaris 10 SPARC)
>>
>> SetInputFilter alterxmlbody (AP_FTYPE_RESOURCE)
>> SetHandler weblogic-handler
>>
>>
>> The handler forwards requests to multiple weblogic servers
>> and the filter itself analyzes and/or changes the POST data
>> in a way that the length of the incoming request may be changed.
>>
>> The question is :
>>
>> What is the proper and legitimate way to deal with this situation?
>>
>>
>> Should the input filter set the new CL value in "headers_in" before
>> returning from the callback, or just remove it from the list?
>>
>>
>> apr_off_t length;
>> apr_brigade_length (bb,1,&length);
>> apr_table_setn(f->r->headers_in, "Content-Length", apr_off_t_toa(f->r->pool,
>> length));
>>
>> Unfortunately, this approach breaks the pipeline because sometimes
>> the filter needs to buffer data over more than one call, but I do not
>> consider this as a problem.
>>
>> or
>>
>> apr_table_unset(f->r->headers_in, "Content-Length");
> You didn't tell how your handler works (how it forwards the request)
> but removing the Content-Length header is probably easiest.
To my knowledge this can be done as follows:
- When "ap_init_filter_func" callback is invoked
(before the handler requests data from the client)
- within "ap_in_filter_func" callback.
I tried but it didn't help, infact it didn't work at all.
> Does the
> upstream server understand HTTP/1.1 or HTTP/1.0 with a TE header?
Yes, It understands HTTP/1.1.
Do you suggest chunked transfer encoding?
Thanks for the help.
Best regards,
Ivan
Re: Input filters that alter content-length
Posted by Ben Noordhuis <in...@bnoordhuis.nl>.
On Tue, Sep 25, 2012 at 1:15 PM, Ivan Prostran <iv...@bulb.hr> wrote:
> Hi,
>
> I have the following scenario :
>
> - Apache/2.2.19 (Solaris 10 SPARC)
>
> SetInputFilter alterxmlbody (AP_FTYPE_RESOURCE)
> SetHandler weblogic-handler
>
>
> The handler forwards requests to multiple weblogic servers
> and the filter itself analyzes and/or changes the POST data
> in a way that the length of the incoming request may be changed.
>
> The question is :
>
> What is the proper and legitimate way to deal with this situation?
>
>
> Should the input filter set the new CL value in "headers_in" before
> returning from the callback, or just remove it from the list?
>
>
> apr_off_t length;
> apr_brigade_length (bb,1,&length);
> apr_table_setn(f->r->headers_in, "Content-Length", apr_off_t_toa(f->r->pool,
> length));
>
> Unfortunately, this approach breaks the pipeline because sometimes
> the filter needs to buffer data over more than one call, but I do not
> consider this as a problem.
>
> or
>
> apr_table_unset(f->r->headers_in, "Content-Length");
You didn't tell how your handler works (how it forwards the request)
but removing the Content-Length header is probably easiest. Does the
upstream server understand HTTP/1.1 or HTTP/1.0 with a TE header?