test browser network request coalescing

• add two DNS records that point to 127.0.0.1 in your /etc/hosts file:

  127.0.0.1	    lh1
  127.0.0.1	    lh2
  

• host this directory. eg with http-server

  http-server -p 9090
  

• start the tcp-aware HTTP server

  ./server.py
  

• open http://127.0.0.1:9090/two-images.html in your browser

• monitor the TCP connections in server.py's output