Is it possible to change headers on an S3 object without downloading the entire object?

Question

I\'ve uploaded a bunch of images to Amazon S3, and now want to add a Cache-Control header to them.

Can the header be updated without downloading the entire image? I

Answer 1

with the amazon aws-sdk, Doing a copy_object with extra headers seems to do the trick for setting caching control headers for an existing S3 Object.

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 "aws-key" , "secret" => "aws-secret") ;


        $s3 = new AmazonS3($options);
        $bucket = "bucket.3mik.com" ;


    $exists = $s3->if_bucket_exists($bucket);
    if(!$exists) {
        trigger_error("S3 bucket does not exists \n" , E_USER_ERROR);
    }

    $name = "cows-and-aliens.jpg" ;
    echo " change headers for $name  \n" ;
    $source = array("bucket" => $bucket, "filename" => $name);
    $dest = array("bucket" => $bucket, "filename" => $name);

    //caching headers
    $offset = 3600*24*365;
    $expiresOn = gmdate('D, d M Y H:i:s \G\M\T', time() + $offset);
    $headers = array('Expires' => $expiresOn, 'Cache-Control' => 'public, max-age=31536000');

       $meta = array('acl' => AmazonS3::ACL_PUBLIC, 'headers' => $headers);

    $response = $s3->copy_object($source,$dest,$meta);
    if($response->isOk()){
        printf("copy object done \n" );

    }else {
        printf("Error in copy object \n" );
    }

?>

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