Add support for HTTP 1.0

[sdeleuze]

As discussed recently about the issue raised on https://jira.spring.io/browse/SPR-14964, a very simple ab -n 1 -c 1 http://localhost:8082/items/10 on Spring + Reactor Netty based server block forever likely because Reactor Netty does not support HTTP 1.0.

[sdeleuze]

See RxNetty feedback which supports that but only explicitly ReactiveX/RxNetty#575 (comment)

[bclozel]

Someone also reported that Reactor Netty doesn't support "Connection: close" request headers in this case.

See SPR-16309.

[johnny]

I cannot reproduce this issue anymore. Has this been closed?

[violetagg]

@johnny I have to check this, we haven't worked on that.

[sdeleuze]

Indeed I can't reproduce it anymore so closing this issue.