PutS3Object should support national characters in filenames

PutS3Object sends the filename in the Content-Disposition HTTP header to S3.
If the filename contains national characters, then the encoding will be wrong which results in the following error:

com.amazonaws.services.s3.model.AmazonS3Exception: The request signature we calculated does not match the signature you provided.

(Due to the character encoding error, the S3 client and the server calculate the signature based on different byte sequences.)

The filename should be URL encoded before sending to S3.