FromHttpMessageWriter and MultipartHttpMessageWriter both support MultiValueMap except the former supports String values only. This presents an issue since either full generic type information must be provided, which is cumbersome on the client side, or if left out there is no good way to order the writers to make a proper decision. This commit: - refines the canWrite behavior of to not a accept MultiValueMap without proper generic information unless the MediaType is explicitly set providing a strong hint. - modifies MultipartHttpMessageWriter to be configured with a FormHttpMessageWriter so it can write both plan and multipart data with the ability to properly differentiate based on actual map values. Issue: SPR-16131
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