HTTP trailers in requests

[damianorenfer]

It looks like vert.x HTTP client and server only support HTTP trailers in responses.

1. Am I right ?
2. If yes, was there a particular reason to not do the same for requests ? Could it be a new feature ?

[vietj]

@damianorenfer I think it has never been done because not asked, of course it could be also done, contributions are accepted as usual