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'
run lambda { |env| [200, {}, []] }
Looks like this on the wire:
HEAD / HTTP/1.1
User-Agent: curl/7.24.0 (x86_64-apple-darwin12.0) libcurl/7.24.0
OpenSSL/0.9.8x zlib/1.2.5
Host: localhost:8080
Accept: */*
HTTP/1.1 200 OK
Date: Thu, 13 Jun 2013 16:04:55 GMT
Status: 200 OK
Connection: close
Transfer-Encoding: chunked
0
HTTP/1.1 500 Internal Server Error
As you can see, not only is there a zero-length chunked encoding body, but for
some unknown reason there is a 500 response with no body as well.
Please cc any responses directly to me, as I do not subscribe to this list.
Cheers,
Jonathan
[1] https://tools.ietf.org/html/rfc2616#section-9.4
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