fix HTTP header for user-defined object metadata #17
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There was a typo in
prependXAMZMeta()
. According to the S3 documentation, when adding user-defined object metadata, the metadata key must start with the all-lowercase prefixx-amz-meta-
. I also added two unit tests for testing the metadata feature.See S3 doc: https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html#UserMetadata