Did you do this step (from about page 8 of the ThingWorx 8 Install Guide)
Go to the location of the Tomcat installation and open the server.xml file in the conf folder. For example, C:\Program Files\Apache Software Foundation\Tomcat 8.0\conf\server.xml
Replace HTTP/1.1 with protocol="org.apache.coyote.http11.Http11NioProtocol"
Looks like it's still trying to use HTTP/1.1 in your error messages.
-- Craig A.