Can I update an existing Amazon S3 object header properties? - amazon-s3

Question

I have a problem of Content-Type empty for video files and wanted to update those objects with Content-Type: video/** based on extension of the file. But when i am using the put method for same key/bucket with content-type it is being overridden with '0' content-length.
Can I update an existing Amazon S3 object? link says
put will override the file s3 object which doesn't serve my purpose.
Note: I don't want to use Java SDK. I want to use normal the Java httpput due to memory constraints of the mobile.

Answer 1

What you could try is to use the PUT COPY request with the same source and target.
PUT /yourvideo.flv HTTP/1.1
Host: bucket.s3.amazonaws.com
Date: Wed, 28 Oct 2009 22:32:00 GMT
x-amz-copy-source: /bucket/yourvideo.flv
Authorization: AWS AKIAIOSFODNN7EXAMPLE:0RQf4/cRonhpaBX5sCYVf1bNRuU=
Apparently python boto modifies metadata this way
Yes, I can confirm, copy is working:
PUT /test/123.png HTTP/1.1\r\n
Host: yourbucket.s3.amazonaws.com\r\n
Accept-Encoding: identity\r\n
Content-Length: 0\r\n
x-amz-storage-class: STANDARD\r\n
x-amz-copy-source: yourbucket/test/123.png\r\n
Date: Fri, 11 Jan 2013 15:16:48 GMT\r\n
Content-Type: image/gif\r\n # this is the content-type set
Authorization: AWS AKXXXXXDDRXXXXXX63CA:RcktkZ9nPwsXXXXXd+KXXXXXY=\r\n
x-amz-metadata-directive: REPLACE\r\n
\r\n
S3 Reply:
HTTP/1.1 200 OK
x-amz-id-2: Vf1bRJd+e4ru0y73GB0Ra0xYB2vv6GLWYKsHAC4AzE+a8uZB56Xy8+YTDkJ0/wfN
x-amz-request-id: C0E6A2823F3FB3E9
Date: Fri, 11 Jan 2013 15:16:49 GMT
Content-Type: application/xml
Content-Length: 234
Server: AmazonS3
Verification:
HEAD /test/123.png HTTP/1.1\r\n
Host: yourbucket.s3.amazonaws.com\r\n
Accept-Encoding: identity\r\n
Date: Fri, 11 Jan 2013 15:25:23 GMT\r\n
Content-Length: 0\r\n
Authorization: AWS AXXXIXXXXMDDXXXXX7XXXCA :HoZ4Woxxw6SWlxxxx000Rxxm8ODQ=\r\n
\r\n
S3 replies with the correct content-type ( the one I set wrongly to image/gif instead of image/png )
HTTP/1.1 200 OK
x-amz-id-2: 7Ut6sdm6i+1h7Di5UrB4v9Sn3mVCNjyDnkb4rm1jGzN6wBTgDT2/yCSHdrKG12Jd
x-amz-request-id: 38A1F6EC6ECD1D2D
Date: Fri, 11 Jan 2013 15:25:24 GMT
Last-Modified: Fri, 11 Jan 2013 15:25:24 GMT
ETag: "c09fad0faf4e6bb1148670af78b6de41"
Accept-Ranges: bytes
Content-Type: image/gif
Content-Length: 122311
Server: AmazonS3