Support for HttpEntity<?> in @MVC [SPR-7018]

**[Arjen Poutsma](https://jira.spring.io/secure/ViewProfile.jspa?name=arjen.poutsma)** opened **[SPR-7018](https://jira.spring.io/browse/SPR-7018?redirect=false)** and commented

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**Issue Links:**
- #11634 Introduce HttpEntity (_**"depends on"**_)

**Referenced from:** commits https://github.com/spring-projects/spring-framework/commit/b07d02f1bf08a8e50deb3274007b4094171ed609
