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https://issues.apache.org/jira/browse/HDDS-517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16643003#comment-16643003
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LiXin Ge commented on HDDS-517:
-------------------------------

Sorry for the late response here, [~elek], I just come back from holidays, and 
thanks for your review and further demonstrate.
bq. It's not clear why do you need the s3ResMeta
It's just a try to make it act more like real AWS. However, to be honest, it's 
of small significance as you said, I have removed the s3ResMeta in patch 001.
bq.Currently I didn't get 404 in in case of missing key.
Patch 001 fixed this, I can see the 404 in my local as below now:
{noformat}
[root@EC130 bin]# curl -v -I  http://127.0.0.1:9878/vol1/bucket/key2
* About to connect() to 127.0.0.1 port 9878 (#0)
*   Trying 127.0.0.1... connected
* Connected to 127.0.0.1 (127.0.0.1) port 9878 (#0)
> HEAD /vol1/bucket/key2 HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.12.9.0 
> zlib/1.2.3 libidn/1.18 libssh2/1.2.2
> Host: 127.0.0.1:9878
> Accept: */*
>
< HTTP/1.1 404 Not Found
HTTP/1.1 404 Not Found
< Date: Tue, 09 Oct 2018 09:12:08 GMT
Date: Tue, 09 Oct 2018 09:12:08 GMT
{noformat}

[~bharatviswa] thanks for your reminding, I have rebased patch 001 based on 
your nice work.

> Implement HeadObject REST endpoint
> ----------------------------------
>
>                 Key: HDDS-517
>                 URL: https://issues.apache.org/jira/browse/HDDS-517
>             Project: Hadoop Distributed Data Store
>          Issue Type: Sub-task
>            Reporter: Elek, Marton
>            Assignee: LiXin Ge
>            Priority: Major
>              Labels: newbie
>         Attachments: HDDS-517.000.patch, HDDS-517.001.patch
>
>
> The HEAD operation retrieves metadata from an object without returning the 
> object itself. This operation is useful if you are interested only in an 
> object's metadata. To use HEAD, you must have READ access to the object.
> Steps:
>  1. Look up the volume
>  2. Read the key and return to the user.
> The AWS reference is here:
> https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectHEAD.html
> We have a simple version of this call in HDDS-444 but without Range support.



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