EAP 6 and 7 have a difference in a handling of HTTP/1.0 requests. EAP 6 returns a protocol of HTTP/1.1 for HTTP/1.0 requests, but EAP 7 returns HTTP/1.0.

- EAP 6
$ curl --http1.0 --dump-header - http://localhost:8080/test/test.jsp
HTTP/1.1 200 OK

- EAP 7
$ curl --http1.0 --dump-header - http://localhost:8080/test/test.jsp
HTTP/1.0 200 OK

According jbossweb and RFC, it seems better to use HTTP/1.1 for a response.

http://docs.jboss.org/jbossweb/7.0.x/config/http.html
RFC 2616 requires that HTTP servers always begin their responses with the highest HTTP version that they claim to support. Therefore, this Connector will always return HTTP/1.1 at the beginning of its responses.

https://tools.ietf.org/html/rfc7230
A server SHOULD send a response version equal to the highest version
to which the server is conformant that has a major version less than
or equal to the one received in the request.