We do not response to gets and dels anymore.
Serve the ui using node instead of using the file.

This seems more natural for testing and we avoid the cross origin
cruft in the code.
Currently we are not using head.

Not sure in which situations the browser is actually using, let's
check if someone finds an issue without it, or if node is
implementing a dumb option like this one.
We are just answering post message in the response function.

We can remove the conditions checking that.