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Posted to users@httpd.apache.org by Sachin Shetty <sa...@gmail.com> on 2015/07/18 14:57:57 UTC
[users@httpd] Http trailers in chunked requests
Hi,
as per http spec, we want clients to send us trailers in chunked requests.
However the request on the server side does not get the trailer at all.
Is there some setting on apache to allow trailers, we are using apache 2.4.
Our request looks like this.
<<<<<
telnet somehost 80
POST /some-path HTTP/1.1
Authorization: Basic XXXX=
Host: somehost.domain.com
Transfer-Encoding: chunked
Trailer: My-Test-Trailer
50
11111111111111111111111111111111111111111111111111111111111111111111111111111111
0
My-Test-Trailer: some-value-new
>>>>>>
Re: [users@httpd] Http trailers in chunked requests
Posted by Eric Covener <co...@gmail.com>.
What module handles this request, and where are you looking for the trailers?
On Sat, Jul 18, 2015 at 8:57 AM, Sachin Shetty <sa...@gmail.com> wrote:
> Hi,
>
> as per http spec, we want clients to send us trailers in chunked requests.
> However the request on the server side does not get the trailer at all.
>
> Is there some setting on apache to allow trailers, we are using apache 2.4.
>
> Our request looks like this.
>
> <<<<<
> telnet somehost 80
> POST /some-path HTTP/1.1
> Authorization: Basic XXXX=
> Host: somehost.domain.com
> Transfer-Encoding: chunked
> Trailer: My-Test-Trailer
>
> 50
> 11111111111111111111111111111111111111111111111111111111111111111111111111111111
> 0
> My-Test-Trailer: some-value-new
>>>>>>>
--
Eric Covener
covener@gmail.com
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Re: [users@httpd] Re: Http trailers in chunked requests
Posted by Yann Ylavic <yl...@gmail.com>.
On Thu, Jul 23, 2015 at 11:03 AM, Sachin Shetty <sa...@gmail.com> wrote:
>
> From the change list, I found
> that you added support for MergeTrailers in 2.4.11 - any idea on how I could
> make it work? I just need apache to let the trailers pass through to the
> upstream haproxy, I am not processing them in mod headers or other apache
> modules.
"MergeTrailers on" will not put the client's trailers into the ones to
be sent to the backend (as you may expect), but instead it merges them
into client's headers (obviously after those have already been sent to
the backend...).
This directive aims to preserve the previous behaviour of httpd (which
was wrong, but we wanted anyone broken by the change to be able to
recover).
The new default is to discard the trailers (or more exactly to put
them separately in the request/response trailers table, but nothing is
using it for now).
I think you should request an enhancement on the bugzilla for
mod_proxy (at least) to handle/forward the trailers, that's not the
case currently, and I agree this is the sequel.
Please note that the trailers shall not be handled/forwarded blindly,
the RFC 7230 (sections 4.1.2, 4.3 and 4.4) is quite strict about
acceptable trailers and how they ought to be announced in the headers
(TE, Trailer, ...), so clients have to conform too.
Regards,
Yann.
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[users@httpd] Re: Http trailers in chunked requests
Posted by Sachin Shetty <sa...@gmail.com>.
Hi Eric,
Sorry to be bugging you on this one, I grepped through the source and I see
some solid references to trailer processing. From the change list, I found
that you added support for MergeTrailers in 2.4.11 - any idea on how I
could make it work? I just need apache to let the trailers pass through to
the upstream haproxy, I am not processing them in mod headers or other
apache modules.
Thanks
Sachin
On Wed, Jul 22, 2015 at 4:55 PM, Sachin Shetty <sa...@gmail.com>
wrote:
> Hi,
>
> I tried with Apache 2.4.16 with the "MergeTrailers On". No luck, apache
> just wont let the trailers pass through. I enabled debug log as well, but
> no additional info in logs about skipping trailers.
>
> Thanks
> Sachin
>
>
> On Mon, Jul 20, 2015 at 11:44 AM, Sachin Shetty <sa...@gmail.com>
> wrote:
>
>> Hi Eric,
>>
>> We are using mod proxy and mod rewrite to forward the request to an
>> haproxy server running a pool of tomcat. I have verified that when the
>> request is directly sent to haproxy, trailers are sent to the tomcat and it
>> does print it in the debug logs.
>>
>> While debugging this I have also noticed that apache converts a chunked
>> request < 8KB to a non chunked one and assembled the whole body before
>> sending it down the proxy.
>>
>> Thanks
>> Sachin
>>
>> Sorry could not figure out how to post from a digest, I have copied your
>> question below:
>>
>> >> What module handles this request, and where are you looking for the
>> trailers?
>>
>>
>> On Sat, Jul 18, 2015 at 6:27 PM, Sachin Shetty <sa...@gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> as per http spec, we want clients to send us trailers in chunked
>>> requests. However the request on the server side does not get the trailer
>>> at all.
>>>
>>> Is there some setting on apache to allow trailers, we are using apache
>>> 2.4.
>>>
>>> Our request looks like this.
>>>
>>> <<<<<
>>> telnet somehost 80
>>> POST /some-path HTTP/1.1
>>> Authorization: Basic XXXX=
>>> Host: somehost.domain.com
>>> Transfer-Encoding: chunked
>>> Trailer: My-Test-Trailer
>>>
>>> 50
>>> 11111111111111111111111111111111111111111111111111111111111111111111111111111111
>>> 0
>>> My-Test-Trailer: some-value-new
>>> >>>>>>
>>>
>>>
>>
>>
>> --
>> Thanks & Regards
>> Sachin Shetty
>>
>> " I never make mistakeas "
>>
>
[users@httpd] Re: Http trailers in chunked requests
Posted by Sachin Shetty <sa...@gmail.com>.
Hi,
I tried with Apache 2.4.16 with the "MergeTrailers On". No luck, apache
just wont let the trailers pass through. I enabled debug log as well, but
no additional info in logs about skipping trailers.
Thanks
Sachin
On Mon, Jul 20, 2015 at 11:44 AM, Sachin Shetty <sa...@gmail.com>
wrote:
> Hi Eric,
>
> We are using mod proxy and mod rewrite to forward the request to an
> haproxy server running a pool of tomcat. I have verified that when the
> request is directly sent to haproxy, trailers are sent to the tomcat and it
> does print it in the debug logs.
>
> While debugging this I have also noticed that apache converts a chunked
> request < 8KB to a non chunked one and assembled the whole body before
> sending it down the proxy.
>
> Thanks
> Sachin
>
> Sorry could not figure out how to post from a digest, I have copied your
> question below:
>
> >> What module handles this request, and where are you looking for the
> trailers?
>
>
> On Sat, Jul 18, 2015 at 6:27 PM, Sachin Shetty <sa...@gmail.com>
> wrote:
>
>> Hi,
>>
>> as per http spec, we want clients to send us trailers in chunked
>> requests. However the request on the server side does not get the trailer
>> at all.
>>
>> Is there some setting on apache to allow trailers, we are using apache
>> 2.4.
>>
>> Our request looks like this.
>>
>> <<<<<
>> telnet somehost 80
>> POST /some-path HTTP/1.1
>> Authorization: Basic XXXX=
>> Host: somehost.domain.com
>> Transfer-Encoding: chunked
>> Trailer: My-Test-Trailer
>>
>> 50
>> 11111111111111111111111111111111111111111111111111111111111111111111111111111111
>> 0
>> My-Test-Trailer: some-value-new
>> >>>>>>
>>
>>
>
>
> --
> Thanks & Regards
> Sachin Shetty
>
> " I never make mistakeas "
>
[users@httpd] Re: Http trailers in chunked requests
Posted by Sachin Shetty <sa...@gmail.com>.
Hi Eric,
We are using mod proxy and mod rewrite to forward the request to an haproxy
server running a pool of tomcat. I have verified that when the request is
directly sent to haproxy, trailers are sent to the tomcat and it does print
it in the debug logs.
While debugging this I have also noticed that apache converts a chunked
request < 8KB to a non chunked one and assembled the whole body before
sending it down the proxy.
Thanks
Sachin
Sorry could not figure out how to post from a digest, I have copied your
question below:
>> What module handles this request, and where are you looking for the
trailers?
On Sat, Jul 18, 2015 at 6:27 PM, Sachin Shetty <sa...@gmail.com>
wrote:
> Hi,
>
> as per http spec, we want clients to send us trailers in chunked requests.
> However the request on the server side does not get the trailer at all.
>
> Is there some setting on apache to allow trailers, we are using apache
> 2.4.
>
> Our request looks like this.
>
> <<<<<
> telnet somehost 80
> POST /some-path HTTP/1.1
> Authorization: Basic XXXX=
> Host: somehost.domain.com
> Transfer-Encoding: chunked
> Trailer: My-Test-Trailer
>
> 50
> 11111111111111111111111111111111111111111111111111111111111111111111111111111111
> 0
> My-Test-Trailer: some-value-new
> >>>>>>
>
>
--
Thanks & Regards
Sachin Shetty
" I never make mistakeas "