* Make sure the uri module warns about using the deprecated HEADER_ arguments, so that we can actually deprecate in a future version
* Use module.deprecate
* No need to de-dupe ourselves, looks like it is done somewhere I didn't initially see
* Only add Content-Type if not specified in headers. Fixes#20046
* Update documentation to indicate body_format will not override Content-Type if specified in headers
Matt Martz
Ansible Test Runner
bart2
Toshio Kuratomi
Matt Clay