disable chunked transfer-encoding

disable chunked transfer-encoding

[dorian taylor]

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Hi,

I'm trying to use Rack as a FastCGI authorizer (cf 
https://github.com/fast-cgi/spec/blob/master/spec.md#63-authorizer ) in 
conjunction with Apache mod_authnz_fcgi 
(https://httpd.apache.org/docs/2.4/mod/mod_authnz_fcgi.html ). My problem 
is that mod_authnz_fcgi insists on a 200 status code and *only* a 200 
status code to communicate any results from the fastcgi script back up the 
line. This is where Rack::Chunked is ruining my day: it forces the choice 
of either a Content-Length header (which is transmitted upstream and 
truncates the output), or a Transfer-Encoding: chunked header where the 
accompanying *token* is removed upstream, resulting in a protocol error.

I would like to be able to express an HTTP 200 response that has neither a 
Content-Length nor a Transfer-Encoding header. Is there any way to disable 
Rack::Chunked for certain responses?

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Re: disable chunked transfer-encoding

[dorian taylor]

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Never mind, looks like after rummaging through handler/fastcgi.rb, the 
answer is to set a Content-Length header to the empty string. This tricks 
Rack::Chunked which only tests for the presence of the header, not its 
content. I'm a bit apprehensive about this solution but for now it works.

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Re: disable chunked transfer-encoding

[James Tucker]

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On Thu, May 23, 2019, 9:11 AM dorian taylor <dorian.taylor@gmail.com> wrote:

> Hi,
>
> I'm trying to use Rack as a FastCGI authorizer (cf
> https://github.com/fast-cgi/spec/blob/master/spec.md#63-authorizer ) in
> conjunction with Apache mod_authnz_fcgi (
> https://httpd.apache.org/docs/2.4/mod/mod_authnz_fcgi.html ). My problem
> is that mod_authnz_fcgi insists on a 200 status code and *only* a 200
> status code to communicate any results from the fastcgi script back up the
> line. This is where Rack::Chunked is ruining my day: it forces the choice
> of either a Content-Length header (which is transmitted upstream and
> truncates the output), or a Transfer-Encoding: chunked header where the
> accompanying *token* is removed upstream, resulting in a protocol error.
>
> I would like to be able to express an HTTP 200 response that has neither a
> Content-Length nor a Transfer-Encoding header. Is there any way to disable
> Rack::Chunked for certain responses?
>

Such a response is only valid in http 1.0, not http 1.1.

In this regard rack won't help you much, as it isn't trying to provide for
that case.

Have you considered not including this middleware for these requests?

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Re: disable chunked transfer-encoding

[dorian taylor]

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On Thursday, May 23, 2019 at 9:15:24 AM UTC-7, raggi wrote:
>
>
> Such a response is only valid in http 1.0, not http 1.1.
>
> In this regard rack won't help you much, as it isn't trying to provide for 
> that case.
>
> Have you considered not including this middleware for these requests?
>
>
Do I get a choice in the matter? If I start the script with rackup it seems 
to add it all by itself:


#<Rack::ContentLength:0x000055d0e32f7f60
 @app=
  #<Rack::Chunked:0x000055d0e32f7fb0
   @app=
    #<Rack::TempfileReaper:0x000055d0e2a07db0
     @app=#<LazyAuth::App:0x000055d0e315e910>>>>
#<LazyAuth::App:0x000055d0e315e910>



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Re: disable chunked transfer-encoding

[James Tucker]

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On Thu, May 23, 2019, 9:18 AM dorian taylor <dorian.taylor@gmail.com> wrote:

>
>
> On Thursday, May 23, 2019 at 9:15:24 AM UTC-7, raggi wrote:
>>
>>
>> Such a response is only valid in http 1.0, not http 1.1.
>>
>> In this regard rack won't help you much, as it isn't trying to provide
>> for that case.
>>
>> Have you considered not including this middleware for these requests?
>>
>>
> Do I get a choice in the matter? If I start the script with rackup it
> seems to add it all by itself:
>
>
> #<Rack::ContentLength:0x000055d0e32f7f60
>  @app=
>   #<Rack::Chunked:0x000055d0e32f7fb0
>    @app=
>     #<Rack::TempfileReaper:0x000055d0e2a07db0
>      @app=#<LazyAuth::App:0x000055d0e315e910>>>>
> #<LazyAuth::App:0x000055d0e315e910>
>
>
>
rackup is an opinionated tool that is good for 90% of use cases and adds
those middleware to meet that goal.

I would say the behavior you need falls out of that use case set, and you
should consider writing your fastcgi spawner using the library primitives.




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Re: disable chunked transfer-encoding

[James Tucker]

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On Thu, May 23, 2019, 9:41 AM James Tucker <jftucker@gmail.com> wrote:

>
>
> On Thu, May 23, 2019, 9:18 AM dorian taylor <dorian.taylor@gmail.com>
> wrote:
>
>>
>>
>> On Thursday, May 23, 2019 at 9:15:24 AM UTC-7, raggi wrote:
>>>
>>>
>>> Such a response is only valid in http 1.0, not http 1.1.
>>>
>>> In this regard rack won't help you much, as it isn't trying to provide
>>> for that case.
>>>
>>> Have you considered not including this middleware for these requests?
>>>
>>>
>> Do I get a choice in the matter? If I start the script with rackup it
>> seems to add it all by itself:
>>
>>
>> #<Rack::ContentLength:0x000055d0e32f7f60
>>  @app=
>>   #<Rack::Chunked:0x000055d0e32f7fb0
>>    @app=
>>     #<Rack::TempfileReaper:0x000055d0e2a07db0
>>      @app=#<LazyAuth::App:0x000055d0e315e910>>>>
>> #<LazyAuth::App:0x000055d0e315e910>
>>
>>
>>
> rackup is an opinionated tool that is good for 90% of use cases and adds
> those middleware to meet that goal.
>
> I would say the behavior you need falls out of that use case set, and you
> should consider writing your fastcgi spawner using the library primitives.
>



It's been a long while, but I think if you pass the "none" environment
these middleware will be elided.


>
>
>
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>> .
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>>
>

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Re: disable chunked transfer-encoding

[dorian taylor]

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On Thursday, May 23, 2019 at 9:42:06 AM UTC-7, raggi wrote:

rackup is an opinionated tool that is good for 90% of use cases and adds 
> those middleware to meet that goal.
>
> I would say the behavior you need falls out of that use case set, and you 
> should consider writing your fastcgi spawner using the library primitives.
>
>
Ah, yes, thanks. It'll probably end up that way; I'm just sketching it out 
right now: https://github.com/doriantaylor/rb-lazyauth

Also the 'none' environment indeed seems to skip the stock middleware. 
Thanks!

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