From: Jonathan Rudenberg <jonathan@titanous.com>
To: Eric Wong <normalperson@yhbt.net>
Cc: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: HEAD responses contain body
Date: Thu, 13 Jun 2013 15:34:31 -0400 [thread overview]
Message-ID: <97CE040B-C9AC-4CC9-B45E-358F1553A6DB@titanous.com> (raw)
In-Reply-To: <46E5FBD0-C0EF-4338-9B78-1A8ED036A47F@titanous.com>
On Jun 13, 2013, at 3:28 PM, Jonathan Rudenberg <jonathan@titanous.com> wrote:
>
> On Jun 13, 2013, at 3:21 PM, Eric Wong <normalperson@yhbt.net> wrote:
>
>> Jonathan Rudenberg <jonathan@titanous.com> wrote:
>>> On Jun 13, 2013, at 2:22 PM, Eric Wong <normalperson@yhbt.net> wrote:
>>>> Jonathan Rudenberg <jonathan@titanous.com> wrote:
>>>>> RFC 2616 section 9.4[1] states:
>>>>>
>>>>>> The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response.
>>>>>
>>>>> A HEAD request against this simple Rack app running on unicorn-4.6.2:
>>>>>
>>>>> require 'rack'
>>>>>
>>>>
>>>> + use Rack::Head
>>>>
>>>>> run lambda { |env| [200, {}, []] }
>>>>
>>>> The Rack::Head middleware should be used to correctly strip HEAD
>>>> responses of their bodies (frameworks such as Rails/Sinatra should
>>>> already add Rack::Head to the middleware stack for you)
>>>
>>> This does not change the result, as the Rack::Head implementation looks like this:
>>>
>>> def call(env)
>>> status, headers, body = @app.call(env)
>>>
>>> if env["REQUEST_METHOD"] == "HEAD"
>>> body.close if body.respond_to? :close
>>> [status, headers, []]
>>> else
>>> [status, headers, body]
>>> end
>>> end
>>
>> OK, I think you were hitting another problem because you were lacking
>> Rack::ContentType
>>
>> Try the following:
>> -----------------------8<---------------------
>> require 'rack'
>> use Rack::ContentLength # less ambiguous than Rack::Chunked adding '0'
>> use Rack::Head
>> use Rack::ContentType
>> run lambda { |env| [200, {}, []] }
>> -----------------------8<---------------------
>
> Thanks, this stack works.
>
>> I added the Rack::ContentLength (it's already in the default middleware
>> stack) since I believe Rack::Chunked adding the '0' is a violation of
>> rfc2616... I'll need to read more closely to be sure.
>
> Hmm, so this is a bug in Rack::Chunked? My reading of the spec says that the '0' is incorrect.
Actually, the solution is that Rack::Head needs to come before Rack::Chunked. Perhaps Rack's default development stack should include this?
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next prev parent reply other threads:[~2013-06-13 20:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-13 16:09 HEAD responses contain body Jonathan Rudenberg
2013-06-13 18:22 ` Eric Wong
2013-06-13 18:42 ` Jonathan Rudenberg
2013-06-13 19:21 ` Eric Wong
2013-06-13 19:28 ` Jonathan Rudenberg
2013-06-13 19:34 ` Jonathan Rudenberg [this message]
2013-06-13 19:45 ` Eric Wong
2013-06-13 19:54 ` Jonathan Rudenberg
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