upgrade http1.0 to http1.1 in response

*Title*: *HTTP 1.0 / 1.1 : implementation of RFC 2145*

*Description*:
According to nginx behaviour and RFC 2145. See this [link](https://serverfault.com/questions/442960/nginx-ignoring-clients-http-1-0-request-and-respond-by-http-1-1) for a TLDR. One receiving an http1.0 request should reply with either a 1.0 or a 1.1 response but the 1.1 would be prefered.

By creating an HTTP connection manager and allowing the http1.0 and 0.9 protocols as specified in the documentation. If I do a request using http1.0 protocol, a response using the 1.1 protocol should be prefered. Nevertheless I am getting an http1.0 response.

Is this behaviour normal and am i not understanding the RFC correctly or is this a bug ?