Also, you can easily avoid the need for optional injection (so you can declare the variables final and use constructor injection) by setting the default values for the headers in the [SwiftApiMetadata default properties](https://github.com/jclouds/jclouds/blob/master/apis/openstack-swift/src/main/java/org/jclouds/openstack/swift/v1/SwiftApiMetadata.java#L59-L66). That would be also a cleaner approach.
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