- use html `base` tag containing the context path once instead inside
every single URL/link.
- update and enhance `nginx-contextpath` example
- export javascript code into separated file
- Add TODO note to javascript clipboard check (from PR#250) since
Firefox and Safari do not support the current implementation
Switch from absolute paths `hostpath` to relative paths `contextpath`.
Unfortunately, for the url input javascript is necessary to resolve the
relative url.
Also see Issue #205.
