[sheepdog] [PATCH v7 1/2] sheep/http: add range support for swift insterface

[Liu Yuan]

On Tue, Jan 21, 2014 at 05:54:14PM +0800, Robin Dong wrote:
> From: Robin Dong <sanbai at taobao.com>
> 
> In swift spec, "Range: bytes=13-15" in http header means "read the three bytes
> of data after a 13-byte offset". We add this support by parsing http header and
> read specific bytes in range.
> 
> We don't support multi-ranges at present.
> 
> Signed-off-by: Robin Dong <sanbai at taobao.com>
> ---
> v6-->v7:
>     1. return error if 'offset' reachs out of object-size
>     2. add test-case for offset bigger than object-size

We should return "Requested Range Not Satisfiable" to end user of offset > size,
internal error means server is probably donw or cruppted.

Thanks
Yuan