Change Content-Disposition of existing S3 object

Question

In S3 REST API I am adding metadata to an existing object by using the PUT (Copy) command and copying a key to the same location with \'x-amz-metadata-directive\' = \'

Answer 1

Edited for clarity:

Content-Disposition must be set explicitly and not included as x-amz-meta-Content-Disposition. All metadata header names must start with "x-amz-meta-" and be all lowercase.

Thanks to @Eyal for clarifying.

Original:

>SOLVED:
>
>The Doco at http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?RESTAuthentication.html
>
>seems to be wrong it says:
>
>Notice how the 'x-amz-' headers are sorted, white-space trimmed, converted tolowercase, and multiple headers with the same name have been joined using a comma toseparate values.
>
>Note how only the Content-Type and Content-MD5HTTPentity headers appear in the StringToSign .The otherContent-* entity headers do not.
However Content-Disposition must be set specifically and not included as : x-amz-meta-Content-Disposition
>
>It now works fine.