Now GetObject and HeadObject both support
- If-Modified-Since, If-Unmodified-Since
- If-Match, If-None-Match
request headers.
These headers are used to further handle the responses for GetObject
and HeadObject API.
Fixes#1098
Currently the server would set 'application/octet-stream' for all
objects, set this value based on the file extension transparently.
This is useful in case of minio browser to facilitate displaying
proper icons for the different mime data types.