Consider buffering HTTP request bodies

[jroper]

Due to the crossing of thread contexts involved with reactive streams, it can be expensive to process small bodies with a reactive streams implementation, it would be a lot faster if the body was passed along with the HTTP header (as part of the FullHttpRequest). The HTTP streams handler could do this by, if the Content-Length is less than a configured threshold, buffer it and emit it in a FullHttpRequest.

[jlouvel]

Sounds like a great idea