Add HTTP 1.0 support

[sdeleuze]

When benchmarking a Spring Web Reactive + RxNetty server application with a simple ab -n 1 -c 1 http://localhost:8083/items/10 command, it blocks indefinitely while it works perfectly fine with curl or wrk. I think this is because ab is using HTTP 1.0 (we had the same issue on Reactor Netty). More details on https://jira.spring.io/browse/SPR-14964.

Could you confirm HTTP 1.0 is not supported yet?

[NiteshKant]

Use HttpServer.sendHttp10ResponseFor10Request(true) to enable sending HTTP/1.0 responses for HTTP/1.0 requests. Javadoc of that method explains the reasoning behind this behavior.

[sdeleuze]

Ok thanks