> Renamed to HEADERS_FILTER and added to the namespace-config. I noticed that also the WEB_ASYNC_MANAGER_FILTER wasn't documented, maybe you can add this.

Thanks for pointing this out. As the async stuff hasn't solidified yet, I have a separate [JIRA](https://jira.springsource.org/browse/SEC-2094) for documentation (I didn't want to spend a ton of time documenting before I knew what the final implementation was going to be).