How to get the request headers from "env" hash?

How to get the request headers from "env" hash?

[Iñaki Baz Castillo]

Hi, I'm just starting with Rack by testing some simple examples.

For now I just would like to know how to get the request headers, as this info 
is not present in "env" hash which just contains:

HTTP_HOST => 127.0.0.1:9292
HTTP_ACCEPT => text/html, image/jpeg;q=0.9, image/png;q=0.9, text/*;q=0.9, 
image/*;q=0.9, */*;q=0.8
SERVER_NAME => 127.0.0.1
rack.url_scheme => http
REQUEST_PATH => /
HTTP_USER_AGENT => Mozilla/5.0 (compatible; Konqueror/4.3; Linux 2.6.28-15-
generic; es, en-GB, en-US, en) KHTML/4.3.0 (like Gecko)
rack.errors => #<IO:0x7f3c3beabab8>
HTTP_ACCEPT_LANGUAGE => es, en-GB, en-US, en
SERVER_PROTOCOL => HTTP/1.1
rack.version => 01
rack.run_once => false
SERVER_SOFTWARE => Mongrel 1.1.5
PATH_INFO => /
REMOTE_ADDR => 127.0.0.1
SCRIPT_NAME =>
rack.multithread => true
HTTP_VERSION => HTTP/1.1
rack.multiprocess => false
REQUEST_URI => /
HTTP_ACCEPT_CHARSET => utf-8, utf-8;q=0.5, *;q=0.5
SERVER_PORT => 9292
REQUEST_METHOD => GET
QUERY_STRING =>
rack.input => #<StringIO:0x7f3c39aaecc8>
HTTP_CONNECTION => Keep-Alive
HTTP_ACCEPT_ENCODING => x-gzip, x-deflate, gzip, deflate
GATEWAY_INTERFACE => CGI/1.2


env["rack.input"] contains a IO object with the request body, but I don't see 
in the above hash how to get the request headers (any header).

Thanks for any help.


-- 
Iñaki Baz Castillo <ibc@aliax.net>

Re: How to get the request headers from "env" hash? [SOLVED]

[Iñaki Baz Castillo]

El Viernes, 28 de Agosto de 2009, Iñaki Baz Castillo escribió:
> but I don't see
> in the above hash how to get the request headers (any header).

Ok, it's done by inspecting env["HTTP_HEADER_NAME"].

:)


However, what about if a header is present more than once? AFAIK HTTP protocol 
allows a header having multivalue in two ways:

1) A single header with values separated by comma.
2) Varios headers with same value and different name.

Rack sems to choose the last matching header as I've realized. Then, what 
about multiple headers with same value?

Thanks.


-- 
Iñaki Baz Castillo <ibc@aliax.net>

Re: How to get the request headers from "env" hash? [SOLVED]

[Iñaki Baz Castillo]

El Viernes, 28 de Agosto de 2009, Iñaki Baz Castillo escribió:
> However, what about if a header is present more than once? AFAIK HTTP
> protocol allows a header having multivalue in two ways:
>
> 1) A single header with values separated by comma.
> 2) Varios headers with same value and different name.
>
> Rack sems to choose the last matching header as I've realized. Then, what
> about multiple headers with same value?

Perhaps this is a task of the web server since it should take all the values 
of header with same name and encode them as comma separated value?


-- 
Iñaki Baz Castillo <ibc@aliax.net>