code: private void initVersion() {
          VersionValues ver = getServiceContext().getRequestVersion();
          VersionValues configVer = getServiceContext().getHttpConfig().getOutgoingVersion();
          if (VersionValues.V10.equals(configVer) && VersionValues.V11.equals(ver)) {
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, "Configuration forcing 1.0 instead of 1.1");
              }
              setVersion(configVer);
          } else {
              setVersion(ver);
          }
      }
docs: Initialize the response version to either match the request version or
  to the lower 1.0 version based on the channel configuration.